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Try to be a little more descriptive about the effect of this flag, rather than parroting what was said in the paragraph just above.
1899 lines
82 KiB
Groff
1899 lines
82 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at http://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH curl 1 "14 April 2009" "Curl 7.21.6" "Curl Manual"
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.SH NAME
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curl \- transfer a URL
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.SH SYNOPSIS
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.B curl [options]
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.I [URL...]
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.SH DESCRIPTION
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.B curl
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is a tool to transfer data from or to a server, using one of the supported
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protocols (DICT, FILE, FTP, FTPS, GOPHER, HTTP, HTTPS, IMAP, IMAPS, LDAP,
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LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMTP, SMTPS, TELNET and TFTP). The
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command is designed to work without user interaction.
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curl offers a busload of useful tricks like proxy support, user
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authentication, FTP upload, HTTP post, SSL connections, cookies, file transfer
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resume and more. As you will see below, the number of features will make your
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head spin!
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curl is powered by libcurl for all transfer-related features. See
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.BR libcurl (3)
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for details.
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.SH URL
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The URL syntax is protocol-dependent. You'll find a detailed description in
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RFC 3986.
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You can specify multiple URLs or parts of URLs by writing part sets within
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braces as in:
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http://site.{one,two,three}.com
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or you can get sequences of alphanumeric series by using [] as in:
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ftp://ftp.numericals.com/file[1-100].txt
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ftp://ftp.numericals.com/file[001-100].txt (with leading zeros)
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ftp://ftp.letters.com/file[a-z].txt
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Nested sequences are not supported, but you can use several ones next to each
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other:
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http://any.org/archive[1996-1999]/vol[1-4]/part{a,b,c}.html
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You can specify any amount of URLs on the command line. They will be fetched
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in a sequential manner in the specified order.
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You can specify a step counter for the ranges to get every Nth number or
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letter:
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http://www.numericals.com/file[1-100:10].txt
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http://www.letters.com/file[a-z:2].txt
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If you specify URL without protocol:// prefix, curl will attempt to guess what
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protocol you might want. It will then default to HTTP but try other protocols
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based on often-used host name prefixes. For example, for host names starting
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with "ftp." curl will assume you want to speak FTP.
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curl will do its best to use what you pass to it as a URL. It is not trying to
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validate it as a syntactically correct URL by any means but is instead
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\fBvery\fP liberal with what it accepts.
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Curl will attempt to re-use connections for multiple file transfers, so that
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getting many files from the same server will not do multiple connects /
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handshakes. This improves speed. Of course this is only done on files
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specified on a single command line and cannot be used between separate curl
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invokes.
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.SH "PROGRESS METER"
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curl normally displays a progress meter during operations, indicating the amount
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of transferred data, transfer speeds and estimated time left, etc.
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curl displays this data to the terminal by default, so if you invoke curl to
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do an operation and it is about to write data to the terminal, it
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\fIdisables\fP the progress meter as otherwise it would mess up the output
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mixing progress meter and response data.
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If you want a progress meter for HTTP POST or PUT requests, you need to
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redirect the response output to a file, using shell redirect (>), -o [file] or
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similar.
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It is not the same case for FTP upload as that operation does not spit out
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any response data to the terminal.
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If you prefer a progress "bar" instead of the regular meter, \fI-#\fP is your
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friend.
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.SH OPTIONS
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In general, all boolean options are enabled with --option and yet again
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disabled with --\fBno-\fPoption. That is, you use the exact same option name
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but prefix it with "no-". However, in this list we mostly only list and show
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the --option version of them. (This concept with --no options was added in
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7.19.0. Previously most options were toggled on/off on repeated use of the
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same command line option.)
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.IP "-#, --progress-bar"
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Make curl display progress as a simple progress bar instead of the standard,
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more informational, meter.
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.IP "-0, --http1.0"
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(HTTP) Forces curl to issue its requests using HTTP 1.0 instead of using its
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internally preferred: HTTP 1.1.
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.IP "-1, --tlsv1"
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(SSL)
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Forces curl to use TLS version 1 when negotiating with a remote TLS server.
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.IP "-2, --sslv2"
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(SSL)
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Forces curl to use SSL version 2 when negotiating with a remote SSL server.
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.IP "-3, --sslv3"
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(SSL)
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Forces curl to use SSL version 3 when negotiating with a remote SSL server.
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.IP "-4, --ipv4"
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If libcurl is capable of resolving an address to multiple IP versions (which
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it is if it is IPv6-capable), this option tells libcurl to resolve names to
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IPv4 addresses only.
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.IP "-6, --ipv6"
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If libcurl is capable of resolving an address to multiple IP versions (which
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it is if it is IPv6-capable), this option tells libcurl to resolve names to
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IPv6 addresses only.
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default statistics.
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.IP "-a, --append"
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(FTP/SFTP) When used in an upload, this will tell curl to append to the target
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file instead of overwriting it. If the file doesn't exist, it will be created.
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Note that this flag is ignored by some SSH servers (including OpenSSH).
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.IP "-A, --user-agent <agent string>"
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(HTTP) Specify the User-Agent string to send to the HTTP server. Some badly
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done CGIs fail if this field isn't set to "Mozilla/4.0". To encode blanks in
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the string, surround the string with single quote marks. This can also be set
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with the \fI-H, --header\fP option of course.
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If this option is set more than once, the last one will be the one that's
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used.
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.IP "--anyauth"
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(HTTP) Tells curl to figure out authentication method by itself, and use the
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most secure one the remote site claims to support. This is done by first
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doing a request and checking the response-headers, thus possibly inducing an
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extra network round-trip. This is used instead of setting a specific
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authentication method, which you can do with \fI--basic\fP, \fI--digest\fP,
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\fI--ntlm\fP, and \fI--negotiate\fP.
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Note that using --anyauth is not recommended if you do uploads from stdin,
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since it may require data to be sent twice and then the client must be able to
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rewind. If the need should arise when uploading from stdin, the upload
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operation will fail.
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.IP "-b, --cookie <name=data>"
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(HTTP)
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Pass the data to the HTTP server as a cookie. It is supposedly the
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data previously received from the server in a "Set-Cookie:" line.
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The data should be in the format "NAME1=VALUE1; NAME2=VALUE2".
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If no '=' symbol is used in the line, it is treated as a filename to use to
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read previously stored cookie lines from, which should be used in this session
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if they match. Using this method also activates the "cookie parser" which will
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make curl record incoming cookies too, which may be handy if you're using this
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in combination with the \fI-L, --location\fP option. The file format of the
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file to read cookies from should be plain HTTP headers or the Netscape/Mozilla
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cookie file format.
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\fBNOTE\fP that the file specified with \fI-b, --cookie\fP is only used as
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input. No cookies will be stored in the file. To store cookies, use the
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\fI-c, --cookie-jar\fP option or you could even save the HTTP headers to a file
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using \fI-D, --dump-header\fP!
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If this option is set more than once, the last one will be the one that's
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used.
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.IP "-B, --use-ascii"
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Enable ASCII transfer when using FTP or LDAP. For FTP, this can also be
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enforced by using an URL that ends with ";type=A". This option causes data
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sent to stdout to be in text mode for win32 systems.
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.IP "--basic"
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(HTTP) Tells curl to use HTTP Basic authentication. This is the default and
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this option is usually pointless, unless you use it to override a previously
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set option that sets a different authentication method (such as \fI--ntlm\fP,
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\fI--digest\fP, or \fI--negotiate\fP).
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.IP "-c, --cookie-jar <file name>"
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Specify to which file you want curl to write all cookies after a completed
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operation. Curl writes all cookies previously read from a specified file as
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well as all cookies received from remote server(s). If no cookies are known,
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no file will be written. The file will be written using the Netscape cookie
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file format. If you set the file name to a single dash, "-", the cookies will
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be written to stdout.
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This command line option will activate the cookie engine that makes curl
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record and use cookies. Another way to activate it is to use the \fI-b,
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--cookie\fP option.
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If the cookie jar can't be created or written to, the whole curl operation
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won't fail or even report an error clearly. Using -v will get a warning
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displayed, but that is the only visible feedback you get about this possibly
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lethal situation.
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If this option is used several times, the last specified file name will be
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used.
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.IP "-C, --continue-at <offset>"
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Continue/Resume a previous file transfer at the given offset. The given offset
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is the exact number of bytes that will be skipped, counting from the beginning
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of the source file before it is transferred to the destination. If used with
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uploads, the FTP server command SIZE will not be used by curl.
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Use "-C -" to tell curl to automatically find out where/how to resume the
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transfer. It then uses the given output/input files to figure that out.
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If this option is used several times, the last one will be used.
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.IP "--ciphers <list of ciphers>"
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(SSL) Specifies which ciphers to use in the connection. The list of ciphers
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must specify valid ciphers. Read up on SSL cipher list details on this URL:
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\fIhttp://www.openssl.org/docs/apps/ciphers.html\fP
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NSS ciphers are done differently than OpenSSL and GnuTLS. The full list of
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NSS ciphers is in the NSSCipherSuite entry at this URL:
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\fIhttp://directory.fedora.redhat.com/docs/mod_nss.html#Directives\fP
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If this option is used several times, the last one will override the others.
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.IP "--compressed"
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(HTTP) Request a compressed response using one of the algorithms libcurl
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supports, and save the uncompressed document. If this option is used and the
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server sends an unsupported encoding, curl will report an error.
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.IP "--connect-timeout <seconds>"
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Maximum time in seconds that you allow the connection to the server to take.
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This only limits the connection phase, once curl has connected this option is
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of no more use. See also the \fI-m, --max-time\fP option.
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If this option is used several times, the last one will be used.
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.IP "--create-dirs"
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When used in conjunction with the -o option, curl will create the necessary
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local directory hierarchy as needed. This option creates the dirs mentioned
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with the -o option, nothing else. If the -o file name uses no dir or if the
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dirs it mentions already exist, no dir will be created.
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To create remote directories when using FTP or SFTP, try
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\fI--ftp-create-dirs\fP.
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.IP "--crlf"
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(FTP) Convert LF to CRLF in upload. Useful for MVS (OS/390).
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.IP "--crlfile <file>"
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(HTTPS/FTPS) Provide a file using PEM format with a Certificate Revocation
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List that may specify peer certificates that are to be considered revoked.
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If this option is used several times, the last one will be used.
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(Added in 7.19.7)
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.IP "-d, --data <data>"
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(HTTP) Sends the specified data in a POST request to the HTTP server, in the
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same way that a browser does when a user has filled in an HTML form and
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presses the submit button. This will cause curl to pass the data to the server
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using the content-type application/x-www-form-urlencoded. Compare to
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\fI-F, --form\fP.
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\fI-d, --data\fP is the same as \fI--data-ascii\fP. To post data purely binary,
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you should instead use the \fI--data-binary\fP option. To URL-encode the value
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of a form field you may use \fI--data-urlencode\fP.
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If any of these options is used more than once on the same command line, the
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data pieces specified will be merged together with a separating
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&-symbol. Thus, using '-d name=daniel -d skill=lousy' would generate a post
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chunk that looks like \&'name=daniel&skill=lousy'.
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If you start the data with the letter @, the rest should be a file name to
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read the data from, or - if you want curl to read the data from stdin. The
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contents of the file must already be URL-encoded. Multiple files can also be
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specified. Posting data from a file named 'foobar' would thus be done with
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\fI--data @foobar\fP.
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.IP "-D, --dump-header <file>"
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Write the protocol headers to the specified file.
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This option is handy to use when you want to store the headers that a HTTP
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site sends to you. Cookies from the headers could then be read in a second
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curl invocation by using the \fI-b, --cookie\fP option! The
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\fI-c, --cookie-jar\fP option is however a better way to store cookies.
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When used in FTP, the FTP server response lines are considered being "headers"
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and thus are saved there.
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If this option is used several times, the last one will be used. IP
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"--data-ascii <data>" See \fI-d, --data\fP.
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.IP "--data-binary <data>"
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(HTTP) This posts data exactly as specified with no extra processing
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whatsoever.
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If you start the data with the letter @, the rest should be a filename. Data
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is posted in a similar manner as \fI--data-ascii\fP does, except that newlines
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are preserved and conversions are never done.
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If this option is used several times, the ones following the first will append
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data as described in \fI-d, --data\fP.
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.IP "--data-urlencode <data>"
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(HTTP) This posts data, similar to the other --data options with the exception
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that this performs URL-encoding. (Added in 7.18.0)
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To be CGI-compliant, the <data> part should begin with a \fIname\fP followed
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by a separator and a content specification. The <data> part can be passed to
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curl using one of the following syntaxes:
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.RS
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.IP "content"
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This will make curl URL-encode the content and pass that on. Just be careful
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so that the content doesn't contain any = or @ symbols, as that will then make
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the syntax match one of the other cases below!
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.IP "=content"
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This will make curl URL-encode the content and pass that on. The preceding =
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symbol is not included in the data.
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.IP "name=content"
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This will make curl URL-encode the content part and pass that on. Note that
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the name part is expected to be URL-encoded already.
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.IP "@filename"
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This will make curl load data from the given file (including any newlines),
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URL-encode that data and pass it on in the POST.
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.IP "name@filename"
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This will make curl load data from the given file (including any newlines),
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URL-encode that data and pass it on in the POST. The name part gets an equal
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sign appended, resulting in \fIname=urlencoded-file-content\fP. Note that the
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name is expected to be URL-encoded already.
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.RE
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.IP "--delegation LEVEL"
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Set \fILEVEL\fP to tell the server what it is allowed to delegate when it
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comes to user credentials. Used with GSS/kerberos.
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.RS
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.IP "none"
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Don't allow any delegation.
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.IP "policy"
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Delegates if and only if the OK-AS-DELEGATE flag is set in the Kerberos
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service ticket, which is a matter of realm policy.
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.IP "always"
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Unconditionally allow the server to delegate.
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.RE
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.IP "--digest"
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(HTTP) Enables HTTP Digest authentication. This is a authentication that
|
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prevents the password from being sent over the wire in clear text. Use this in
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|
combination with the normal \fI-u, --user\fP option to set user name and
|
|
password. See also \fI--ntlm\fP, \fI--negotiate\fP and \fI--anyauth\fP for
|
|
related options.
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If this option is used several times, the following occurrences make no
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difference.
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.IP "--disable-eprt"
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(FTP) Tell curl to disable the use of the EPRT and LPRT commands when doing
|
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active FTP transfers. Curl will normally always first attempt to use EPRT,
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then LPRT before using PORT, but with this option, it will use PORT right
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away. EPRT and LPRT are extensions to the original FTP protocol, and may not work
|
|
on all servers, but they enable more functionality in a better way than the
|
|
traditional PORT command.
|
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\fB--eprt\fP can be used to explicitly enable EPRT again and \fB--no-eprt\fP
|
|
is an alias for \fB--disable-eprt\fP.
|
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Disabling EPRT only changes the active behavior. If you want to switch to
|
|
passive mode you need to not use \fI-P, --ftp-port\fP or force it with
|
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\fI--ftp-pasv\fP.
|
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.IP "--disable-epsv"
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(FTP) Tell curl to disable the use of the EPSV command when doing passive FTP
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transfers. Curl will normally always first attempt to use EPSV before PASV,
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but with this option, it will not try using EPSV.
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|
|
\fB--epsv\fP can be used to explicitly enable EPSV again and \fB--no-epsv\fP
|
|
is an alias for \fB--disable-epsv\fP.
|
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|
Disabling EPSV only changes the passive behavior. If you want to switch to
|
|
active mode you need to use \fI-P, --ftp-port\fP.
|
|
.IP "-e, --referer <URL>"
|
|
(HTTP) Sends the "Referer Page" information to the HTTP server. This can also
|
|
be set with the \fI-H, --header\fP flag of course. When used with
|
|
\fI-L, --location\fP you can append ";auto" to the --referer URL to make curl
|
|
automatically set the previous URL when it follows a Location: header. The
|
|
\&";auto" string can be used alone, even if you don't set an initial --referer.
|
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|
|
If this option is used several times, the last one will be used.
|
|
.IP "-E, --cert <certificate[:password]>"
|
|
(SSL) Tells curl to use the specified client certificate file when getting a
|
|
file with HTTPS, FTPS or another SSL-based protocol. The certificate must be
|
|
in PEM format. If the optional password isn't specified, it will be queried
|
|
for on the terminal. Note that this option assumes a \&"certificate" file that
|
|
is the private key and the private certificate concatenated! See \fI--cert\fP
|
|
and \fI--key\fP to specify them independently.
|
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|
|
If curl is built against the NSS SSL library then this option can tell
|
|
curl the nickname of the certificate to use within the NSS database defined
|
|
by the environment variable SSL_DIR (or by default /etc/pki/nssdb). If the
|
|
NSS PEM PKCS#11 module (libnsspem.so) is available then PEM files may be
|
|
loaded. If you want to use a file from the current directory, please precede
|
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it with "./" prefix, in order to avoid confusion with a nickname.
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|
|
If this option is used several times, the last one will be used.
|
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.IP "--engine <name>"
|
|
Select the OpenSSL crypto engine to use for cipher
|
|
operations. Use \fI--engine list\fP to print a list of build-time supported
|
|
engines. Note that not all (or none) of the engines may be available at
|
|
run-time.
|
|
.IP "--environment"
|
|
(RISC OS ONLY) Sets a range of environment variables, using the names the -w
|
|
option supports, to allow easier extraction of useful information after having
|
|
run curl.
|
|
.IP "--egd-file <file>"
|
|
(SSL) Specify the path name to the Entropy Gathering Daemon socket. The socket
|
|
is used to seed the random engine for SSL connections. See also the
|
|
\fI--random-file\fP option.
|
|
.IP "--cert-type <type>"
|
|
(SSL) Tells curl what certificate type the provided certificate is in. PEM,
|
|
DER and ENG are recognized types. If not specified, PEM is assumed.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--cacert <CA certificate>"
|
|
(SSL) Tells curl to use the specified certificate file to verify the peer. The
|
|
file may contain multiple CA certificates. The certificate(s) must be in PEM
|
|
format. Normally curl is built to use a default file for this, so this option
|
|
is typically used to alter that default file.
|
|
|
|
curl recognizes the environment variable named 'CURL_CA_BUNDLE' if it is
|
|
set, and uses the given path as a path to a CA cert bundle. This option
|
|
overrides that variable.
|
|
|
|
The windows version of curl will automatically look for a CA certs file named
|
|
\'curl-ca-bundle.crt\', either in the same directory as curl.exe, or in the
|
|
Current Working Directory, or in any folder along your PATH.
|
|
|
|
If curl is built against the NSS SSL library then this option tells
|
|
curl the nickname of the CA certificate to use within the NSS database
|
|
defined by the environment variable SSL_DIR (or by default /etc/pki/nssdb).
|
|
If the NSS PEM PKCS#11 module (libnsspem.so) is available then PEM files
|
|
may be loaded.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--capath <CA certificate directory>"
|
|
(SSL) Tells curl to use the specified certificate directory to verify the
|
|
peer. The certificates must be in PEM format, and if curl is built against
|
|
OpenSSL, the directory must have been processed using the c_rehash utility
|
|
supplied with OpenSSL. Using \fI--capath\fP can allow OpenSSL-powered curl to
|
|
make SSL-connections much more efficiently than using \fI--cacert\fP if the
|
|
\fI--cacert\fP file contains many CA certificates.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-f, --fail"
|
|
(HTTP) Fail silently (no output at all) on server errors. This is mostly done
|
|
to better enable scripts etc to better deal with failed attempts. In
|
|
normal cases when a HTTP server fails to deliver a document, it returns an
|
|
HTML document stating so (which often also describes why and more). This flag
|
|
will prevent curl from outputting that and return error 22.
|
|
|
|
This method is not fail-safe and there are occasions where non-successful
|
|
response codes will slip through, especially when authentication is involved
|
|
(response codes 401 and 407).
|
|
.IP "-F, --form <name=content>"
|
|
(HTTP) This lets curl emulate a filled-in form in which a user has pressed the
|
|
submit button. This causes curl to POST data using the Content-Type
|
|
multipart/form-data according to RFC 2388. This enables uploading of binary
|
|
files etc. To force the 'content' part to be a file, prefix the file name
|
|
with an @ sign. To just get the content part from a file, prefix the file name
|
|
with the symbol <. The difference between @ and < is then that @ makes a file
|
|
get attached in the post as a file upload, while the < makes a text field and
|
|
just get the contents for that text field from a file.
|
|
|
|
Example, to send your password file to the server, where
|
|
\&'password' is the name of the form-field to which /etc/passwd will be the
|
|
input:
|
|
|
|
\fBcurl\fP -F password=@/etc/passwd www.mypasswords.com
|
|
|
|
To read content from stdin instead of a file, use - as the filename. This goes
|
|
for both @ and < constructs.
|
|
|
|
You can also tell curl what Content-Type to use by using 'type=', in a manner
|
|
similar to:
|
|
|
|
\fBcurl\fP -F "web=@index.html;type=text/html" url.com
|
|
|
|
or
|
|
|
|
\fBcurl\fP -F "name=daniel;type=text/foo" url.com
|
|
|
|
You can also explicitly change the name field of a file upload part by setting
|
|
filename=, like this:
|
|
|
|
\fBcurl\fP -F "file=@localfile;filename=nameinpost" url.com
|
|
|
|
See further examples and details in the MANUAL.
|
|
|
|
This option can be used multiple times.
|
|
.IP "--ftp-account [data]"
|
|
(FTP) When an FTP server asks for "account data" after user name and password
|
|
has been provided, this data is sent off using the ACCT command. (Added in
|
|
7.13.0)
|
|
|
|
If this option is used twice, the second will override the previous use.
|
|
.IP "--ftp-alternative-to-user <command>"
|
|
(FTP) If authenticating with the USER and PASS commands fails, send this
|
|
command. When connecting to Tumbleweed's Secure Transport server over FTPS
|
|
using a client certificate, using "SITE AUTH" will tell the server to retrieve
|
|
the username from the certificate. (Added in 7.15.5)
|
|
.IP "--ftp-create-dirs"
|
|
(FTP/SFTP) When an FTP or SFTP URL/operation uses a path that doesn't
|
|
currently exist on the server, the standard behavior of curl is to
|
|
fail. Using this option, curl will instead attempt to create missing
|
|
directories.
|
|
.IP "--ftp-method [method]"
|
|
(FTP) Control what method curl should use to reach a file on a FTP(S)
|
|
server. The method argument should be one of the following alternatives:
|
|
.RS
|
|
.IP multicwd
|
|
curl does a single CWD operation for each path part in the given URL. For deep
|
|
hierarchies this means very many commands. This is how RFC 1738 says it should
|
|
be done. This is the default but the slowest behavior.
|
|
.IP nocwd
|
|
curl does no CWD at all. curl will do SIZE, RETR, STOR etc and give a full
|
|
path to the server for all these commands. This is the fastest behavior.
|
|
.IP singlecwd
|
|
curl does one CWD with the full target directory and then operates on the file
|
|
\&"normally" (like in the multicwd case). This is somewhat more standards
|
|
compliant than 'nocwd' but without the full penalty of 'multicwd'.
|
|
.RE
|
|
(Added in 7.15.1)
|
|
.IP "--ftp-pasv"
|
|
(FTP) Use passive mode for the data connection. Passive is the internal default
|
|
behavior, but using this option can be used to override a previous
|
|
\fI-P/-ftp-port\fP option. (Added in 7.11.0)
|
|
|
|
If this option is used several times, the following occurrences make no
|
|
difference. Undoing an enforced passive really isn't doable but you must then
|
|
instead enforce the correct \fI-P, --ftp-port\fP again.
|
|
|
|
Passive mode means that curl will try the EPSV command first and then PASV,
|
|
unless \fI--disable-epsv\fP is used.
|
|
.IP "--ftp-skip-pasv-ip"
|
|
(FTP) Tell curl to not use the IP address the server suggests in its response
|
|
to curl's PASV command when curl connects the data connection. Instead curl
|
|
will re-use the same IP address it already uses for the control
|
|
connection. (Added in 7.14.2)
|
|
|
|
This option has no effect if PORT, EPRT or EPSV is used instead of PASV.
|
|
.IP "--ftp-pret"
|
|
(FTP) Tell curl to send a PRET command before PASV (and EPSV). Certain
|
|
FTP servers, mainly drftpd, require this non-standard command for
|
|
directory listings as well as up and downloads in PASV mode.
|
|
(Added in 7.20.x)
|
|
.IP "--ftp-ssl-ccc"
|
|
(FTP) Use CCC (Clear Command Channel)
|
|
Shuts down the SSL/TLS layer after authenticating. The rest of the
|
|
control channel communication will be unencrypted. This allows
|
|
NAT routers to follow the FTP transaction. The default mode is
|
|
passive. See --ftp-ssl-ccc-mode for other modes.
|
|
(Added in 7.16.1)
|
|
.IP "--ftp-ssl-ccc-mode [active/passive]"
|
|
(FTP) Use CCC (Clear Command Channel)
|
|
Sets the CCC mode. The passive mode will not initiate the shutdown, but
|
|
instead wait for the server to do it, and will not reply to the
|
|
shutdown from the server. The active mode initiates the shutdown and
|
|
waits for a reply from the server.
|
|
(Added in 7.16.2)
|
|
.IP "--ftp-ssl-control"
|
|
(FTP) Require SSL/TLS for the FTP login, clear for transfer. Allows secure
|
|
authentication, but non-encrypted data transfers for efficiency. Fails the
|
|
transfer if the server doesn't support SSL/TLS. (Added in 7.16.0)
|
|
that can still be used but will be removed in a future version.
|
|
.IP "--form-string <name=string>"
|
|
(HTTP) Similar to \fI--form\fP except that the value string for the named
|
|
parameter is used literally. Leading \&'@' and \&'<' characters, and the
|
|
\&';type=' string in the value have no special meaning. Use this in preference
|
|
to \fI--form\fP if there's any possibility that the string value may
|
|
accidentally trigger the \&'@' or \&'<' features of \fI--form\fP.
|
|
.IP "-g, --globoff"
|
|
This option switches off the "URL globbing parser". When you set this option,
|
|
you can specify URLs that contain the letters {}[] without having them being
|
|
interpreted by curl itself. Note that these letters are not normal legal URL
|
|
contents but they should be encoded according to the URI standard.
|
|
.IP "-G, --get"
|
|
When used, this option will make all data specified with \fI-d, --data\fP or
|
|
\fI--data-binary\fP to be used in a HTTP GET request instead of the POST
|
|
request that otherwise would be used. The data will be appended to the URL
|
|
with a '?' separator.
|
|
|
|
If used in combination with -I, the POST data will instead be appended to the
|
|
URL with a HEAD request.
|
|
|
|
If this option is used several times, the following occurrences make no
|
|
difference. This is because undoing a GET doesn't make sense, but you should
|
|
then instead enforce the alternative method you prefer.
|
|
.IP "-H, --header <header>"
|
|
(HTTP) Extra header to use when getting a web page. You may specify any number
|
|
of extra headers. Note that if you should add a custom header that has the
|
|
same name as one of the internal ones curl would use, your externally set
|
|
header will be used instead of the internal one. This allows you to make even
|
|
trickier stuff than curl would normally do. You should not replace internally
|
|
set headers without knowing perfectly well what you're doing. Remove an
|
|
internal header by giving a replacement without content on the right side of
|
|
the colon, as in: -H \&"Host:". If you send the custom header with no-value then
|
|
its header must be terminated with a semicolon, such as \-H "X-Custom-Header;"
|
|
to send "X-Custom-Header:".
|
|
|
|
curl will make sure that each header you add/replace is sent with the proper
|
|
end-of-line marker, you should thus \fBnot\fP add that as a part of the header
|
|
content: do not add newlines or carriage returns, they will only mess things up
|
|
for you.
|
|
|
|
See also the \fI-A, --user-agent\fP and \fI-e, --referer\fP options.
|
|
|
|
This option can be used multiple times to add/replace/remove multiple headers.
|
|
.IP "--hostpubmd5 <md5>"
|
|
Pass a string containing 32 hexadecimal digits. The string should be the 128
|
|
bit MD5 checksum of the remote host's public key, curl will refuse the
|
|
connection with the host unless the md5sums match. This option is only for SCP
|
|
and SFTP transfers. (Added in 7.17.1)
|
|
.IP "--ignore-content-length"
|
|
(HTTP)
|
|
Ignore the Content-Length header. This is particularly useful for servers
|
|
running Apache 1.x, which will report incorrect Content-Length for files
|
|
larger than 2 gigabytes.
|
|
.IP "-i, --include"
|
|
(HTTP) Include the HTTP-header in the output. The HTTP-header includes things
|
|
like server-name, date of the document, HTTP-version and more...
|
|
.IP "-I, --head"
|
|
(HTTP/FTP/FILE)
|
|
Fetch the HTTP-header only! HTTP-servers feature the command HEAD
|
|
which this uses to get nothing but the header of a document. When used
|
|
on a FTP or FILE file, curl displays the file size and last modification
|
|
time only.
|
|
.IP "--interface <name>"
|
|
Perform an operation using a specified interface. You can enter interface
|
|
name, IP address or host name. An example could look like:
|
|
|
|
curl --interface eth0:1 http://www.netscape.com/
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-j, --junk-session-cookies"
|
|
(HTTP) When curl is told to read cookies from a given file, this option will
|
|
make it discard all "session cookies". This will basically have the same effect
|
|
as if a new session is started. Typical browsers always discard session
|
|
cookies when they're closed down.
|
|
.IP "-J, --remote-header-name"
|
|
(HTTP) This option tells the -O, --remote-name option to use the server-specified
|
|
Content-Disposition filename instead of extracting a filename from the URL.
|
|
.IP "-k, --insecure"
|
|
(SSL) This option explicitly allows curl to perform "insecure" SSL connections
|
|
and transfers. All SSL connections are attempted to be made secure by using
|
|
the CA certificate bundle installed by default. This makes all connections
|
|
considered "insecure" fail unless \fI-k, --insecure\fP is used.
|
|
|
|
See this online resource for further details:
|
|
\fBhttp://curl.haxx.se/docs/sslcerts.html\fP
|
|
.IP "-K, --config <config file>"
|
|
Specify which config file to read curl arguments from. The config file is a
|
|
text file in which command line arguments can be written which then will be
|
|
used as if they were written on the actual command line. Options and their
|
|
parameters must be specified on the same config file line, separated by
|
|
whitespace, colon, the equals sign or any combination thereof (however,
|
|
the preferred separator is the equals sign). If the parameter is to contain
|
|
whitespace, the parameter must be enclosed within quotes. Within double
|
|
quotes, the following escape sequences are available: \\\\, \\", \\t, \\n,
|
|
\\r and \\v. A backslash preceding any other letter is ignored. If the
|
|
first column of a config line is a '#' character, the rest of the line will be
|
|
treated as a comment. Only write one option per physical line in the config
|
|
file.
|
|
|
|
Specify the filename to -K, --config as '-' to make curl read the file from
|
|
stdin.
|
|
|
|
Note that to be able to specify a URL in the config file, you need to specify
|
|
it using the \fI--url\fP option, and not by simply writing the URL on its own
|
|
line. So, it could look similar to this:
|
|
|
|
url = "http://curl.haxx.se/docs/"
|
|
|
|
Long option names can optionally be given in the config file without the
|
|
initial double dashes.
|
|
|
|
When curl is invoked, it always (unless \fI-q\fP is used) checks for a default
|
|
config file and uses it if found. The default config file is checked for in
|
|
the following places in this order:
|
|
|
|
1) curl tries to find the "home dir": It first checks for the CURL_HOME and
|
|
then the HOME environment variables. Failing that, it uses getpwuid() on
|
|
UNIX-like systems (which returns the home dir given the current user in your
|
|
system). On Windows, it then checks for the APPDATA variable, or as a last
|
|
resort the '%USERPROFILE%\\Application Data'.
|
|
|
|
2) On windows, if there is no _curlrc file in the home dir, it checks for one
|
|
in the same dir the curl executable is placed. On UNIX-like systems, it will
|
|
simply try to load .curlrc from the determined home dir.
|
|
|
|
.nf
|
|
# --- Example file ---
|
|
# this is a comment
|
|
url = "curl.haxx.se"
|
|
output = "curlhere.html"
|
|
user-agent = "superagent/1.0"
|
|
|
|
# and fetch another URL too
|
|
url = "curl.haxx.se/docs/manpage.html"
|
|
-O
|
|
referer = "http://nowhereatall.com/"
|
|
# --- End of example file ---
|
|
.fi
|
|
|
|
This option can be used multiple times to load multiple config files.
|
|
.IP "--keepalive-time <seconds>"
|
|
This option sets the time a connection needs to remain idle before sending
|
|
keepalive probes and the time between individual keepalive probes. It is
|
|
currently effective on operating systems offering the TCP_KEEPIDLE and
|
|
TCP_KEEPINTVL socket options (meaning Linux, recent AIX, HP-UX and more). This
|
|
option has no effect if \fI--no-keepalive\fP is used. (Added in 7.18.0)
|
|
|
|
If this option is used multiple times, the last occurrence sets the amount.
|
|
.IP "--key <key>"
|
|
(SSL/SSH) Private key file name. Allows you to provide your private key in this
|
|
separate file.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--key-type <type>"
|
|
(SSL) Private key file type. Specify which type your \fI--key\fP provided
|
|
private key is. DER, PEM, and ENG are supported. If not specified, PEM is
|
|
assumed.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--krb <level>"
|
|
(FTP) Enable Kerberos authentication and use. The level must be entered and
|
|
should be one of 'clear', 'safe', 'confidential', or 'private'. Should you use
|
|
a level that is not one of these, 'private' will instead be used.
|
|
|
|
This option requires a library built with kerberos4 or GSSAPI
|
|
(GSS-Negotiate) support. This is not very common. Use \fI-V, --version\fP to
|
|
see if your curl supports it.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-l, --list-only"
|
|
(FTP)
|
|
When listing an FTP directory, this switch forces a name-only view.
|
|
Especially useful if you want to machine-parse the contents of an FTP
|
|
directory since the normal directory view doesn't use a standard look
|
|
or format.
|
|
|
|
This option causes an FTP NLST command to be sent. Some FTP servers
|
|
list only files in their response to NLST; they do not include
|
|
subdirectories and symbolic links.
|
|
|
|
.IP "-L, --location"
|
|
(HTTP/HTTPS) If the server reports that the requested page has moved to a
|
|
different location (indicated with a Location: header and a 3XX response code),
|
|
this option will make curl redo the request on the new place. If used together
|
|
with \fI-i, --include\fP or \fI-I, --head\fP, headers from all requested pages
|
|
will be shown. When authentication is used, curl only sends its credentials to
|
|
the initial host. If a redirect takes curl to a different host, it won't be
|
|
able to intercept the user+password. See also \fI--location-trusted\fP on how
|
|
to change this. You can limit the amount of redirects to follow by using the
|
|
\fI--max-redirs\fP option.
|
|
|
|
When curl follows a redirect and the request is not a plain GET (for example
|
|
POST or PUT), it will do the following request with a GET if the HTTP response
|
|
was 301, 302, or 303. If the response code was any other 3xx code, curl will
|
|
re-send the following request using the same unmodified method.
|
|
.IP "--libcurl <file>"
|
|
Append this option to any ordinary curl command line, and you will get a
|
|
libcurl-using source code written to the file that does the equivalent
|
|
of what your command-line operation does!
|
|
|
|
NOTE: this does not properly support -F and the sending of multipart
|
|
formposts, so in those cases the output program will be missing necessary
|
|
calls to \fIcurl_formadd(3)\fP, and possibly more.
|
|
|
|
If this option is used several times, the last given file name will be
|
|
used. (Added in 7.16.1)
|
|
.IP "--limit-rate <speed>"
|
|
Specify the maximum transfer rate you want curl to use. This feature is useful
|
|
if you have a limited pipe and you'd like your transfer not to use your entire
|
|
bandwidth.
|
|
|
|
The given speed is measured in bytes/second, unless a suffix is appended.
|
|
Appending 'k' or 'K' will count the number as kilobytes, 'm' or M' makes it
|
|
megabytes, while 'g' or 'G' makes it gigabytes. Examples: 200K, 3m and 1G.
|
|
|
|
The given rate is the average speed counted during the entire transfer. It
|
|
means that curl might use higher transfer speeds in short bursts, but over
|
|
time it uses no more than the given rate.
|
|
|
|
If you also use the \fI-Y, --speed-limit\fP option, that option will take
|
|
precedence and might cripple the rate-limiting slightly, to help keeping the
|
|
speed-limit logic working.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--local-port <num>[-num]"
|
|
Set a preferred number or range of local port numbers to use for the
|
|
connection(s). Note that port numbers by nature are a scarce resource that
|
|
will be busy at times so setting this range to something too narrow might
|
|
cause unnecessary connection setup failures. (Added in 7.15.2)
|
|
.IP "--location-trusted"
|
|
(HTTP/HTTPS) Like \fI-L, --location\fP, but will allow sending the name +
|
|
password to all hosts that the site may redirect to. This may or may not
|
|
introduce a security breach if the site redirects you to a site to which
|
|
you'll send your authentication info (which is plaintext in the case of HTTP
|
|
Basic authentication).
|
|
.IP "-m, --max-time <seconds>"
|
|
Maximum time in seconds that you allow the whole operation to take. This is
|
|
useful for preventing your batch jobs from hanging for hours due to slow
|
|
networks or links going down. See also the \fI--connect-timeout\fP option.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--mail-from <address>"
|
|
(SMTP) Specify a single address that the given mail should get sent from.
|
|
|
|
(Added in 7.20.0)
|
|
.IP "--max-filesize <bytes>"
|
|
Specify the maximum size (in bytes) of a file to download. If the file
|
|
requested is larger than this value, the transfer will not start and curl will
|
|
return with exit code 63.
|
|
|
|
\fBNOTE:\fP The file size is not always known prior to download, and for such files
|
|
this option has no effect even if the file transfer ends up being larger than
|
|
this given limit. This concerns both FTP and HTTP transfers.
|
|
.IP "--mail-rcpt <address>"
|
|
(SMTP) Specify a single address that the given mail should get sent to. This
|
|
option can be used multiple times to specify many recipients.
|
|
|
|
(Added in 7.20.0)
|
|
.IP "--max-redirs <num>"
|
|
Set maximum number of redirection-followings allowed. If \fI-L, --location\fP
|
|
is used, this option can be used to prevent curl from following redirections
|
|
\&"in absurdum". By default, the limit is set to 50 redirections. Set this
|
|
option to -1 to make it limitless.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-n, --netrc"
|
|
Makes curl scan the \fI.netrc\fP (\fI_netrc\fP on Windows) file in the user's
|
|
home directory for login name and password. This is typically used for FTP on
|
|
UNIX. If used with HTTP, curl will enable user authentication. See
|
|
.BR netrc(4)
|
|
or
|
|
.BR ftp(1)
|
|
for details on the file format. Curl will not complain if that file
|
|
doesn't have the right permissions (it should not be either world- or
|
|
group-readable). The environment variable "HOME" is used to find the home
|
|
directory.
|
|
|
|
A quick and very simple example of how to setup a \fI.netrc\fP to allow curl
|
|
to FTP to the machine host.domain.com with user name \&'myself' and password
|
|
\&'secret' should look similar to:
|
|
|
|
.B "machine host.domain.com login myself password secret"
|
|
.IP "-N, --no-buffer"
|
|
Disables the buffering of the output stream. In normal work situations, curl
|
|
will use a standard buffered output stream that will have the effect that it
|
|
will output the data in chunks, not necessarily exactly when the data arrives.
|
|
Using this option will disable that buffering.
|
|
|
|
Note that this is the negated option name documented. You can thus use
|
|
\fI--buffer\fP to enforce the buffering.
|
|
.IP "--netrc-file"
|
|
This option is similar to \fI--netrc\fP, except that you provide the path
|
|
(absolute or relative) to the netrc file that Curl should use.
|
|
You can only specify one netrc file per invocation. If several
|
|
\fI--netrc-file\fP options are provided, only the \fBlast one\fP will be used.
|
|
(Added in 7.21.5)
|
|
|
|
This option overrides any use of \fI--netrc\fP as they are mutually exclusive.
|
|
It will also abide by --netrc-optional if specified.
|
|
|
|
.IP "--netrc-optional"
|
|
Very similar to \fI--netrc\fP, but this option makes the .netrc usage
|
|
\fBoptional\fP and not mandatory as the \fI--netrc\fP option does.
|
|
|
|
.IP "--negotiate"
|
|
(HTTP) Enables GSS-Negotiate authentication. The GSS-Negotiate method was
|
|
designed by Microsoft and is used in their web applications. It is primarily
|
|
meant as a support for Kerberos5 authentication but may be also used along
|
|
with another authentication method. For more information see IETF draft
|
|
draft-brezak-spnego-http-04.txt.
|
|
|
|
If you want to enable Negotiate for your proxy authentication, then use
|
|
\fI--proxy-negotiate\fP.
|
|
|
|
This option requires a library built with GSSAPI support. This is
|
|
not very common. Use \fI-V, --version\fP to see if your version supports
|
|
GSS-Negotiate.
|
|
|
|
When using this option, you must also provide a fake -u, --user option to
|
|
activate the authentication code properly. Sending a '-u :' is enough as the
|
|
user name and password from the -u option aren't actually used.
|
|
|
|
If this option is used several times, the following occurrences make no
|
|
difference.
|
|
.IP "--no-keepalive"
|
|
Disables the use of keepalive messages on the TCP connection, as by default
|
|
curl enables them.
|
|
|
|
Note that this is the negated option name documented. You can thus use
|
|
\fI--keepalive\fP to enforce keepalive.
|
|
.IP "--no-sessionid"
|
|
(SSL) Disable curl's use of SSL session-ID caching. By default all transfers
|
|
are done using the cache. Note that while nothing should ever get hurt by
|
|
attempting to reuse SSL session-IDs, there seem to be broken SSL
|
|
implementations in the wild that may require you to disable this in order for
|
|
you to succeed. (Added in 7.16.0)
|
|
|
|
Note that this is the negated option name documented. You can thus use
|
|
\fI--sessionid\fP to enforce session-ID caching.
|
|
.IP "--noproxy <no-proxy-list>"
|
|
Comma-separated list of hosts which do not use a proxy, if one is specified.
|
|
The only wildcard is a single * character, which matches all hosts, and
|
|
effectively disables the proxy. Each name in this list is matched as either
|
|
a domain which contains the hostname, or the hostname itself. For example,
|
|
local.com would match local.com, local.com:80, and www.local.com, but not
|
|
www.notlocal.com. (Added in 7.19.4).
|
|
.IP "--ntlm"
|
|
(HTTP) Enables NTLM authentication. The NTLM authentication method was
|
|
designed by Microsoft and is used by IIS web servers. It is a proprietary
|
|
protocol, reverse-engineered by clever people and implemented in curl based
|
|
on their efforts. This kind of behavior should not be endorsed, you should
|
|
encourage everyone who uses NTLM to switch to a public and documented
|
|
authentication method instead, such as Digest.
|
|
|
|
If you want to enable NTLM for your proxy authentication, then use
|
|
\fI--proxy-ntlm\fP.
|
|
|
|
This option requires a library built with SSL support. Use
|
|
\fI-V, --version\fP to see if your curl supports NTLM.
|
|
|
|
If this option is used several times, the following occurrences make no
|
|
difference.
|
|
.IP "-o, --output <file>"
|
|
Write output to <file> instead of stdout. If you are using {} or [] to fetch
|
|
multiple documents, you can use '#' followed by a number in the <file>
|
|
specifier. That variable will be replaced with the current string for the URL
|
|
being fetched. Like in:
|
|
|
|
curl http://{one,two}.site.com -o "file_#1.txt"
|
|
|
|
or use several variables like:
|
|
|
|
curl http://{site,host}.host[1-5].com -o "#1_#2"
|
|
|
|
You may use this option as many times as the number of URLs you have.
|
|
|
|
See also the \fI--create-dirs\fP option to create the local directories
|
|
dynamically. Specifying the output as '-' (a single dash) will force the
|
|
output to be done to stdout.
|
|
.IP "-O, --remote-name"
|
|
Write output to a local file named like the remote file we get. (Only the file
|
|
part of the remote file is used, the path is cut off.)
|
|
|
|
The remote file name to use for saving is extracted from the given URL,
|
|
nothing else.
|
|
|
|
Consequentially, the file will be saved in the current working directory. If
|
|
you want the file saved in a different directory, make sure you change current
|
|
working directory before you invoke curl with the \fB-O, --remote-name\fP flag!
|
|
|
|
You may use this option as many times as the number of URLs you have.
|
|
.IP "-p, --proxytunnel"
|
|
When an HTTP proxy is used (\fI-x, --proxy\fP), this option will cause non-HTTP
|
|
protocols to attempt to tunnel through the proxy instead of merely using it to
|
|
do HTTP-like operations. The tunnel approach is made with the HTTP proxy
|
|
CONNECT request and requires that the proxy allows direct connect to the
|
|
remote port number curl wants to tunnel through to.
|
|
.IP "-P, --ftp-port <address>"
|
|
(FTP) Reverses the default initiator/listener roles when connecting with
|
|
FTP. This switch makes curl use active mode. In practice, curl then tells the
|
|
server to connect back to the client's specified address and port, while
|
|
passive mode asks the server to setup an IP address and port for it to connect
|
|
to. <address> should be one of:
|
|
.RS
|
|
.IP interface
|
|
i.e "eth0" to specify which interface's IP address you want to use (Unix only)
|
|
.IP "IP address"
|
|
i.e "192.168.10.1" to specify the exact IP address
|
|
.IP "host name"
|
|
i.e "my.host.domain" to specify the machine
|
|
.IP "-"
|
|
make curl pick the same IP address that is already used for the control
|
|
connection
|
|
.RE
|
|
|
|
If this option is used several times, the last one will be used. Disable the
|
|
use of PORT with \fI--ftp-pasv\fP. Disable the attempt to use the EPRT command
|
|
instead of PORT by using \fI--disable-eprt\fP. EPRT is really PORT++.
|
|
|
|
Starting in 7.19.5, you can append \&":[start]-[end]\&" to the right of the
|
|
address, to tell curl what TCP port range to use. That means you specify a
|
|
port range, from a lower to a higher number. A single number works as well,
|
|
but do note that it increases the risk of failure since the port may not be
|
|
available.
|
|
.IP "--pass <phrase>"
|
|
(SSL/SSH) Passphrase for the private key
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--post301"
|
|
Tells curl to respect RFC 2616/10.3.2 and not convert POST requests into GET
|
|
requests when following a 301 redirection. The non-RFC behaviour is ubiquitous
|
|
in web browsers, so curl does the conversion by default to maintain
|
|
consistency. However, a server may require a POST to remain a POST after such
|
|
a redirection. This option is meaningful only when using \fI-L, --location\fP
|
|
(Added in 7.17.1)
|
|
.IP "--post302"
|
|
Tells curl to respect RFC 2616/10.3.2 and not convert POST requests into GET
|
|
requests when following a 302 redirection. The non-RFC behaviour is ubiquitous
|
|
in web browsers, so curl does the conversion by default to maintain
|
|
consistency. However, a server may require a POST to remain a POST after such
|
|
a redirection. This option is meaningful only when using \fI-L, --location\fP
|
|
(Added in 7.19.1)
|
|
.IP "--proto <protocols>"
|
|
Tells curl to use the listed protocols for its initial retrieval. Protocols
|
|
are evaluated left to right, are comma separated, and are each a protocol
|
|
name or 'all', optionally prefixed by zero or more modifiers. Available
|
|
modifiers are:
|
|
.RS
|
|
.TP 3
|
|
.B +
|
|
Permit this protocol in addition to protocols already permitted (this is
|
|
the default if no modifier is used).
|
|
.TP
|
|
.B -
|
|
Deny this protocol, removing it from the list of protocols already permitted.
|
|
.TP
|
|
.B =
|
|
Permit only this protocol (ignoring the list already permitted), though
|
|
subject to later modification by subsequent entries in the comma separated
|
|
list.
|
|
.RE
|
|
.IP
|
|
For example:
|
|
.RS
|
|
.TP 15
|
|
.B --proto -ftps
|
|
uses the default protocols, but disables ftps
|
|
.TP
|
|
.B --proto -all,https,+http
|
|
only enables http and https
|
|
.TP
|
|
.B --proto =http,https
|
|
also only enables http and https
|
|
.RE
|
|
.IP
|
|
Unknown protocols produce a warning. This allows scripts to safely rely on
|
|
being able to disable potentially dangerous protocols, without relying upon
|
|
support for that protocol being built into curl to avoid an error.
|
|
|
|
This option can be used multiple times, in which case the effect is the same
|
|
as concatenating the protocols into one instance of the option.
|
|
|
|
(Added in 7.20.2)
|
|
.IP "--proto-redir <protocols>"
|
|
Tells curl to use the listed protocols after a redirect. See --proto for
|
|
how protocols are represented.
|
|
|
|
(Added in 7.20.2)
|
|
.IP "--proxy-anyauth"
|
|
Tells curl to pick a suitable authentication method when communicating with
|
|
the given proxy. This might cause an extra request/response round-trip. (Added
|
|
in 7.13.2)
|
|
.IP "--proxy-basic"
|
|
Tells curl to use HTTP Basic authentication when communicating with the given
|
|
proxy. Use \fI--basic\fP for enabling HTTP Basic with a remote host. Basic is
|
|
the default authentication method curl uses with proxies.
|
|
.IP "--proxy-digest"
|
|
Tells curl to use HTTP Digest authentication when communicating with the given
|
|
proxy. Use \fI--digest\fP for enabling HTTP Digest with a remote host.
|
|
.IP "--proxy-negotiate"
|
|
Tells curl to use HTTP Negotiate authentication when communicating
|
|
with the given proxy. Use \fI--negotiate\fP for enabling HTTP Negotiate
|
|
with a remote host. (Added in 7.17.1)
|
|
.IP "--proxy-ntlm"
|
|
Tells curl to use HTTP NTLM authentication when communicating with the given
|
|
proxy. Use \fI--ntlm\fP for enabling NTLM with a remote host.
|
|
.IP "--proxy1.0 <proxyhost[:port]>"
|
|
Use the specified HTTP 1.0 proxy. If the port number is not specified, it is
|
|
assumed at port 1080.
|
|
|
|
The only difference between this and the HTTP proxy option (\fI-x, --proxy\fP),
|
|
is that attempts to use CONNECT through the proxy will specify an HTTP 1.0
|
|
protocol instead of the default HTTP 1.1.
|
|
.IP "--pubkey <key>"
|
|
(SSH) Public key file name. Allows you to provide your public key in this
|
|
separate file.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-q"
|
|
If used as the first parameter on the command line, the \fIcurlrc\fP config
|
|
file will not be read and used. See the \fI-K, --config\fP for details on the
|
|
default config file search path.
|
|
.IP "-Q, --quote <command>"
|
|
(FTP/SFTP) Send an arbitrary command to the remote FTP or SFTP server. Quote
|
|
commands are sent BEFORE the transfer takes place (just after the initial PWD
|
|
command in an FTP transfer, to be exact). To make commands take place after a
|
|
successful transfer, prefix them with a dash '-'. To make commands be sent
|
|
after libcurl has changed the working directory, just before the transfer
|
|
command(s), prefix the command with a '+' (this is only supported for
|
|
FTP). You may specify any number of commands. If the server returns failure
|
|
for one of the commands, the entire operation will be aborted. You must send
|
|
syntactically correct FTP commands as RFC 959 defines to FTP servers, or one
|
|
of the commands listed below to SFTP servers. This option can be used
|
|
multiple times. When speaking to a FTP server, prefix the command with an
|
|
asterisk (*) to make libcurl continue even if the command fails as by default
|
|
curl will stop at first failure.
|
|
|
|
SFTP is a binary protocol. Unlike for FTP, libcurl interprets SFTP quote
|
|
commands itself before sending them to the server. File names may be quoted
|
|
shell-style to embed spaces or special characters. Following is the list of
|
|
all supported SFTP quote commands:
|
|
.RS
|
|
.IP "chgrp group file"
|
|
The chgrp command sets the group ID of the file named by the file operand to the
|
|
group ID specified by the group operand. The group operand is a decimal
|
|
integer group ID.
|
|
.IP "chmod mode file"
|
|
The chmod command modifies the file mode bits of the specified file. The
|
|
mode operand is an octal integer mode number.
|
|
.IP "chown user file"
|
|
The chown command sets the owner of the file named by the file operand to the
|
|
user ID specified by the user operand. The user operand is a decimal
|
|
integer user ID.
|
|
.IP "ln source_file target_file"
|
|
The ln and symlink commands create a symbolic link at the target_file location
|
|
pointing to the source_file location.
|
|
.IP "mkdir directory_name"
|
|
The mkdir command creates the directory named by the directory_name operand.
|
|
.IP "pwd"
|
|
The pwd command returns the absolute pathname of the current working directory.
|
|
.IP "rename source target"
|
|
The rename command renames the file or directory named by the source
|
|
operand to the destination path named by the target operand.
|
|
.IP "rm file"
|
|
The rm command removes the file specified by the file operand.
|
|
.IP "rmdir directory"
|
|
The rmdir command removes the directory entry specified by the directory
|
|
operand, provided it is empty.
|
|
.IP "symlink source_file target_file"
|
|
See ln.
|
|
.RE
|
|
.IP "-r, --range <range>"
|
|
(HTTP/FTP/SFTP/FILE) Retrieve a byte range (i.e a partial document) from a
|
|
HTTP/1.1, FTP or SFTP server or a local FILE. Ranges can be specified
|
|
in a number of ways.
|
|
.RS
|
|
.TP 10
|
|
.B 0-499
|
|
specifies the first 500 bytes
|
|
.TP
|
|
.B 500-999
|
|
specifies the second 500 bytes
|
|
.TP
|
|
.B -500
|
|
specifies the last 500 bytes
|
|
.TP
|
|
.B 9500-
|
|
specifies the bytes from offset 9500 and forward
|
|
.TP
|
|
.B 0-0,-1
|
|
specifies the first and last byte only(*)(H)
|
|
.TP
|
|
.B 500-700,600-799
|
|
specifies 300 bytes from offset 500(H)
|
|
.TP
|
|
.B 100-199,500-599
|
|
specifies two separate 100-byte ranges(*)(H)
|
|
.RE
|
|
|
|
(*) = NOTE that this will cause the server to reply with a multipart
|
|
response!
|
|
|
|
Only digit characters (0-9) are valid in the 'start' and 'stop' fields of
|
|
the \&'start-stop' range syntax. If a non-digit character is given in the range, the server's
|
|
response will be unspecified, depending on the server's configuration.
|
|
|
|
You should also be aware that many HTTP/1.1 servers do not have this feature
|
|
enabled, so that when you attempt to get a range, you'll instead get the whole
|
|
document.
|
|
|
|
FTP and SFTP range downloads only support the simple 'start-stop' syntax
|
|
(optionally with one of the numbers omitted). FTP use depends on the extended
|
|
FTP command SIZE.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-R, --remote-time"
|
|
When used, this will make libcurl attempt to figure out the timestamp of the
|
|
remote file, and if that is available make the local file get that same
|
|
timestamp.
|
|
.IP "--random-file <file>"
|
|
(SSL) Specify the path name to file containing what will be considered as
|
|
random data. The data is used to seed the random engine for SSL connections.
|
|
See also the \fI--egd-file\fP option.
|
|
.IP "--raw"
|
|
When used, it disables all internal HTTP decoding of content or transfer
|
|
encodings and instead makes them passed on unaltered, raw. (Added in 7.16.2)
|
|
.IP "--remote-name-all"
|
|
This option changes the default action for all given URLs to be dealt with as
|
|
if \fI-O, --remote-name\fP were used for each one. So if you want to disable
|
|
that for a specific URL after \fI--remote-name-all\fP has been used, you must
|
|
use "-o -" or \fI--no-remote-name\fP. (Added in 7.19.0)
|
|
.IP "--resolve <host:port:address>"
|
|
Provide a custom address for a specific host and port pair. Using this, you
|
|
can make the curl requests(s) use a specified address and prevent the
|
|
otherwise normally resolved address to be used. Consider it a sort of
|
|
/etc/hosts alternative provided on the command line. The port number should be
|
|
the number used for the specific protocol the host will be used for. It means
|
|
you need several entries if you want to provide address for the same host but
|
|
different ports.
|
|
|
|
This option can be used many times to add many host names to resolve.
|
|
|
|
(Added in 7.21.3)
|
|
.IP "--retry <num>"
|
|
If a transient error is returned when curl tries to perform a transfer, it
|
|
will retry this number of times before giving up. Setting the number to 0
|
|
makes curl do no retries (which is the default). Transient error means either:
|
|
a timeout, an FTP 4xx response code or an HTTP 5xx response code.
|
|
|
|
When curl is about to retry a transfer, it will first wait one second and then
|
|
for all forthcoming retries it will double the waiting time until it reaches
|
|
10 minutes which then will be the delay between the rest of the retries. By
|
|
using \fI--retry-delay\fP you disable this exponential backoff algorithm. See
|
|
also \fI--retry-max-time\fP to limit the total time allowed for
|
|
retries. (Added in 7.12.3)
|
|
|
|
If this option is used multiple times, the last occurrence decide the amount.
|
|
.IP "--retry-delay <seconds>"
|
|
Make curl sleep this amount of time before each retry when a transfer has
|
|
failed with a transient error (it changes the default backoff time algorithm
|
|
between retries). This option is only interesting if \fI--retry\fP is also
|
|
used. Setting this delay to zero will make curl use the default backoff time.
|
|
(Added in 7.12.3)
|
|
|
|
If this option is used multiple times, the last occurrence determines the amount.
|
|
.IP "--retry-max-time <seconds>"
|
|
The retry timer is reset before the first transfer attempt. Retries will be
|
|
done as usual (see \fI--retry\fP) as long as the timer hasn't reached this
|
|
given limit. Notice that if the timer hasn't reached the limit, the request
|
|
will be made and while performing, it may take longer than this given time
|
|
period. To limit a single request\'s maximum time, use \fI-m, --max-time\fP.
|
|
Set this option to zero to not timeout retries. (Added in 7.12.3)
|
|
|
|
If this option is used multiple times, the last occurrence determines the
|
|
amount.
|
|
.IP "-s, --silent"
|
|
Silent or quiet mode. Don't show progress meter or error messages. Makes
|
|
Curl mute.
|
|
.IP "-S, --show-error"
|
|
When used with -s it makes curl show an error message if it fails.
|
|
.IP "--ssl"
|
|
(FTP, POP3, IMAP, SMTP) Try to use SSL/TLS for the connection. Reverts to a
|
|
non-secure connection if the server doesn't support SSL/TLS. See also
|
|
\fI--ftp-ssl-control\fP and \fI--ssl-reqd\fP for different levels of
|
|
encryption required. (Added in 7.20.0)
|
|
|
|
This option was formerly known as \fI--ftp-ssl\fP (Added in 7.11.0). That
|
|
option name can still be used but will be removed in a future version.
|
|
.IP "--ssl-reqd"
|
|
(FTP, POP3, IMAP, SMTP) Require SSL/TLS for the connection. Terminates the
|
|
connection if the server doesn't support SSL/TLS. (Added in 7.20.0)
|
|
|
|
This option was formerly known as \fI--ftp-ssl-reqd\fP (added in 7.15.5). That
|
|
option name can still be used but will be removed in a future version.
|
|
.IP "--socks4 <host[:port]>"
|
|
Use the specified SOCKS4 proxy. If the port number is not specified, it is
|
|
assumed at port 1080. (Added in 7.15.2)
|
|
|
|
This option overrides any previous use of \fI-x, --proxy\fP, as they are
|
|
mutually exclusive.
|
|
|
|
Since 7.21.7, this option is superfluous since you can specify a socks4 proxy
|
|
with \fI-x, --proxy\fP using a socks4:// protocol prefix.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--socks4a <host[:port]>"
|
|
Use the specified SOCKS4a proxy. If the port number is not specified, it is
|
|
assumed at port 1080. (Added in 7.18.0)
|
|
|
|
This option overrides any previous use of \fI-x, --proxy\fP, as they are
|
|
mutually exclusive.
|
|
|
|
Since 7.21.7, this option is superfluous since you can specify a socks4a proxy
|
|
with \fI-x, --proxy\fP using a socks4a:// protocol prefix.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--socks5-hostname <host[:port]>"
|
|
Use the specified SOCKS5 proxy (and let the proxy resolve the host name). If
|
|
the port number is not specified, it is assumed at port 1080. (Added in
|
|
7.18.0)
|
|
|
|
This option overrides any previous use of \fI-x, --proxy\fP, as they are
|
|
mutually exclusive.
|
|
|
|
Since 7.21.7, this option is superfluous since you can specify a socks5
|
|
hostname proxy with \fI-x, --proxy\fP using a socks5h:// protocol prefix.
|
|
|
|
If this option is used several times, the last one will be used. (This option
|
|
was previously wrongly documented and used as --socks without the number
|
|
appended.)
|
|
.IP "--socks5 <host[:port]>"
|
|
Use the specified SOCKS5 proxy - but resolve the host name locally. If the
|
|
port number is not specified, it is assumed at port 1080.
|
|
|
|
This option overrides any previous use of \fI-x, --proxy\fP, as they are
|
|
mutually exclusive.
|
|
|
|
Since 7.21.7, this option is superfluous since you can specify a socks5 proxy
|
|
with \fI-x, --proxy\fP using a socks5:// protocol prefix.
|
|
|
|
If this option is used several times, the last one will be used. (This option
|
|
was previously wrongly documented and used as --socks without the number
|
|
appended.)
|
|
|
|
This option (as well as \fI--socks4\fP) does not work with IPV6, FTPS or LDAP.
|
|
.IP "--socks5-gssapi-service <servicename>"
|
|
The default service name for a socks server is rcmd/server-fqdn. This option
|
|
allows you to change it.
|
|
|
|
Examples: --socks5 proxy-name \fI--socks5-gssapi-service\fP sockd would use
|
|
sockd/proxy-name --socks5 proxy-name \fI--socks5-gssapi-service\fP
|
|
sockd/real-name would use sockd/real-name for cases where the proxy-name does
|
|
not match the principal name. (Added in 7.19.4).
|
|
.IP "--socks5-gssapi-nec"
|
|
As part of the gssapi negotiation a protection mode is negotiated. RFC 1961
|
|
says in section 4.3/4.4 it should be protected, but the NEC reference
|
|
implementation does not. The option \fI--socks5-gssapi-nec\fP allows the
|
|
unprotected exchange of the protection mode negotiation. (Added in 7.19.4).
|
|
.IP "--stderr <file>"
|
|
Redirect all writes to stderr to the specified file instead. If the file name
|
|
is a plain '-', it is instead written to stdout. This option has no point when
|
|
you're using a shell with decent redirecting capabilities.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-t, --telnet-option <OPT=val>"
|
|
Pass options to the telnet protocol. Supported options are:
|
|
|
|
TTYPE=<term> Sets the terminal type.
|
|
|
|
XDISPLOC=<X display> Sets the X display location.
|
|
|
|
NEW_ENV=<var,val> Sets an environment variable.
|
|
.IP "-T, --upload-file <file>"
|
|
This transfers the specified local file to the remote URL. If there is no file
|
|
part in the specified URL, Curl will append the local file name. NOTE that you
|
|
must use a trailing / on the last directory to really prove to Curl that there
|
|
is no file name or curl will think that your last directory name is the remote
|
|
file name to use. That will most likely cause the upload operation to fail. If
|
|
this is used on a HTTP(S) server, the PUT command will be used.
|
|
|
|
Use the file name "-" (a single dash) to use stdin instead of a given file.
|
|
Alternately, the file name "." (a single period) may be specified instead
|
|
of "-" to use stdin in non-blocking mode to allow reading server output
|
|
while stdin is being uploaded.
|
|
|
|
You can specify one -T for each URL on the command line. Each -T + URL pair
|
|
specifies what to upload and to where. curl also supports "globbing" of the -T
|
|
argument, meaning that you can upload multiple files to a single URL by using
|
|
the same URL globbing style supported in the URL, like this:
|
|
|
|
curl -T "{file1,file2}" http://www.uploadtothissite.com
|
|
|
|
or even
|
|
|
|
curl -T "img[1-1000].png" ftp://ftp.picturemania.com/upload/
|
|
.IP "--tcp-nodelay"
|
|
Turn on the TCP_NODELAY option. See the \fIcurl_easy_setopt(3)\fP man page for
|
|
details about this option. (Added in 7.11.2)
|
|
.IP "--tftp-blksize <value>"
|
|
(TFTP) Set TFTP BLKSIZE option (must be >512). This is the block size that
|
|
curl will try to use when transferring data to or from a TFTP server. By
|
|
default 512 bytes will be used.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
|
|
(Added in 7.20.0)
|
|
.IP "--tlsauthtype <authtype>"
|
|
Set TLS authentication type. Currently, the only supported option is "SRP",
|
|
for TLS-SRP (RFC 5054). If \fI--tlsuser\fP and \fI--tlspassword\fP are
|
|
specified but \fI--tlsauthtype\fP is not, then this option defaults to "SRP".
|
|
(Added in 7.21.4)
|
|
.IP "--tlsuser <user>"
|
|
Set username for use with the TLS authentication method specified with
|
|
\fI--tlsauthtype\fP. Requires that \fI--tlspassword\fP also be set. (Added in
|
|
7.21.4)
|
|
.IP "--tlspassword <password>"
|
|
Set password for use with the TLS authentication method specified with
|
|
\fI--tlsauthtype\fP. Requires that \fI--tlsuser\fP also be set. (Added in
|
|
7.21.4)
|
|
.IP "--tr-encoding"
|
|
(HTTP) Request a compressed Transfer-Encoding response using one of the
|
|
algorithms libcurl supports, and uncompress the data while receiving it.
|
|
|
|
(Added in 7.21.6)
|
|
.IP "--trace <file>"
|
|
Enables a full trace dump of all incoming and outgoing data, including
|
|
descriptive information, to the given output file. Use "-" as filename to have
|
|
the output sent to stdout.
|
|
|
|
This option overrides previous uses of \fI-v, --verbose\fP or
|
|
\fI--trace-ascii\fP.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--trace-ascii <file>"
|
|
Enables a full trace dump of all incoming and outgoing data, including
|
|
descriptive information, to the given output file. Use "-" as filename to have
|
|
the output sent to stdout.
|
|
|
|
This is very similar to \fI--trace\fP, but leaves out the hex part and only
|
|
shows the ASCII part of the dump. It makes smaller output that might be easier
|
|
to read for untrained humans.
|
|
|
|
This option overrides previous uses of \fI-v, --verbose\fP or \fI--trace\fP.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--trace-time"
|
|
Prepends a time stamp to each trace or verbose line that curl displays.
|
|
(Added in 7.14.0)
|
|
.IP "-u, --user <user:password>"
|
|
Specify the user name and password to use for server authentication. Overrides
|
|
\fI-n, --netrc\fP and \fI--netrc-optional\fP.
|
|
|
|
If you just give the user name (without entering a colon) curl will prompt for
|
|
a password.
|
|
|
|
If you use an SSPI-enabled curl binary and do NTLM authentication, you can
|
|
force curl to pick up the user name and password from your environment by
|
|
simply specifying a single colon with this option: "-u :".
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-U, --proxy-user <user:password>"
|
|
Specify the user name and password to use for proxy authentication.
|
|
|
|
If you use an SSPI-enabled curl binary and do NTLM authentication, you can
|
|
force curl to pick up the user name and password from your environment by
|
|
simply specifying a single colon with this option: "-U :".
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--url <URL>"
|
|
Specify a URL to fetch. This option is mostly handy when you want to specify
|
|
URL(s) in a config file.
|
|
|
|
This option may be used any number of times. To control where this URL is
|
|
written, use the \fI-o, --output\fP or the \fI-O, --remote-name\fP options.
|
|
.IP "-v, --verbose"
|
|
Makes the fetching more verbose/talkative. Mostly useful for debugging. A line
|
|
starting with '>' means "header data" sent by curl, '<' means "header data"
|
|
received by curl that is hidden in normal cases, and a line starting with '*'
|
|
means additional info provided by curl.
|
|
|
|
Note that if you only want HTTP headers in the output, \fI-i, --include\fP
|
|
might be the option you're looking for.
|
|
|
|
If you think this option still doesn't give you enough details, consider using
|
|
\fI--trace\fP or \fI--trace-ascii\fP instead.
|
|
|
|
This option overrides previous uses of \fI--trace-ascii\fP or \fI--trace\fP.
|
|
|
|
Use \fI-s, --silent\fP to make curl quiet.
|
|
.IP "-w, --write-out <format>"
|
|
Defines what to display on stdout after a completed and successful
|
|
operation. The format is a string that may contain plain text mixed with any
|
|
number of variables. The string can be specified as "string", to get read from
|
|
a particular file you specify it "@filename" and to tell curl to read the
|
|
format from stdin you write "@-".
|
|
|
|
The variables present in the output format will be substituted by the value or
|
|
text that curl thinks fit, as described below. All variables are specified
|
|
as %{variable_name} and to output a normal % you just write them as
|
|
%%. You can output a newline by using \\n, a carriage return with \\r and a tab
|
|
space with \\t.
|
|
|
|
.B NOTE:
|
|
The %-symbol is a special symbol in the win32-environment, where all
|
|
occurrences of % must be doubled when using this option.
|
|
|
|
The variables available at this point are:
|
|
.RS
|
|
.TP 15
|
|
.B url_effective
|
|
The URL that was fetched last. This is most meaningful if you've told curl
|
|
to follow location: headers.
|
|
.TP
|
|
.B http_code
|
|
The numerical response code that was found in the last retrieved HTTP(S) or
|
|
FTP(s) transfer. In 7.18.2 the alias \fBresponse_code\fP was added to show the
|
|
same info.
|
|
.TP
|
|
.B http_connect
|
|
The numerical code that was found in the last response (from a proxy) to a
|
|
curl CONNECT request. (Added in 7.12.4)
|
|
.TP
|
|
.B time_total
|
|
The total time, in seconds, that the full operation lasted. The time will be
|
|
displayed with millisecond resolution.
|
|
.TP
|
|
.B time_namelookup
|
|
The time, in seconds, it took from the start until the name resolving was
|
|
completed.
|
|
.TP
|
|
.B time_connect
|
|
The time, in seconds, it took from the start until the TCP connect to the
|
|
remote host (or proxy) was completed.
|
|
.TP
|
|
.B time_appconnect
|
|
The time, in seconds, it took from the start until the SSL/SSH/etc
|
|
connect/handshake to the remote host was completed. (Added in 7.19.0)
|
|
.TP
|
|
.B time_pretransfer
|
|
The time, in seconds, it took from the start until the file transfer was just
|
|
about to begin. This includes all pre-transfer commands and negotiations that
|
|
are specific to the particular protocol(s) involved.
|
|
.TP
|
|
.B time_redirect
|
|
The time, in seconds, it took for all redirection steps include name lookup,
|
|
connect, pretransfer and transfer before the final transaction was
|
|
started. time_redirect shows the complete execution time for multiple
|
|
redirections. (Added in 7.12.3)
|
|
.TP
|
|
.B time_starttransfer
|
|
The time, in seconds, it took from the start until the first byte was just about
|
|
to be transferred. This includes time_pretransfer and also the time the
|
|
server needed to calculate the result.
|
|
.TP
|
|
.B size_download
|
|
The total amount of bytes that were downloaded.
|
|
.TP
|
|
.B size_upload
|
|
The total amount of bytes that were uploaded.
|
|
.TP
|
|
.B size_header
|
|
The total amount of bytes of the downloaded headers.
|
|
.TP
|
|
.B size_request
|
|
The total amount of bytes that were sent in the HTTP request.
|
|
.TP
|
|
.B speed_download
|
|
The average download speed that curl measured for the complete download. Bytes
|
|
per second.
|
|
.TP
|
|
.B speed_upload
|
|
The average upload speed that curl measured for the complete upload. Bytes per
|
|
second.
|
|
.TP
|
|
.B content_type
|
|
The Content-Type of the requested document, if there was any.
|
|
.TP
|
|
.B num_connects
|
|
Number of new connects made in the recent transfer. (Added in 7.12.3)
|
|
.TP
|
|
.B num_redirects
|
|
Number of redirects that were followed in the request. (Added in 7.12.3)
|
|
.TP
|
|
.B redirect_url
|
|
When a HTTP request was made without -L to follow redirects, this variable
|
|
will show the actual URL a redirect \fIwould\fP take you to. (Added in 7.18.2)
|
|
.TP
|
|
.B ftp_entry_path
|
|
The initial path libcurl ended up in when logging on to the remote FTP
|
|
server. (Added in 7.15.4)
|
|
.TP
|
|
.B ssl_verify_result
|
|
The result of the SSL peer certificate verification that was requested. 0
|
|
means the verification was successful. (Added in 7.19.0)
|
|
.RE
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-x, --proxy <[protocol://][user@password]proxyhost[:port]>"
|
|
Use the specified HTTP proxy. If the port number is not specified, it is
|
|
assumed at port 1080.
|
|
|
|
This option overrides existing environment variables that set the proxy to
|
|
use. If there's an environment variable setting a proxy, you can set proxy to
|
|
\&"" to override it.
|
|
|
|
All operations that are performed over a HTTP proxy will transparently be
|
|
converted to HTTP. It means that certain protocol specific operations might
|
|
not be available. This is not the case if you can tunnel through the proxy, as
|
|
one with the \fI-p, --proxytunnel\fP option.
|
|
|
|
The proxy host can be specified the exact same way as the proxy environment
|
|
variables, including the protocol prefix (http://) and the embedded user +
|
|
password.
|
|
|
|
From 7.21.7, the proxy string may be specified with a protocol:// prefix to
|
|
specify alternative proxy protocols. Use socks4://, socks4a://, socks5:// or
|
|
socks5h:// to request the specific SOCKS version to be used. No protocol
|
|
specified, http:// and all others will be treated as HTTP proxies.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-X, --request <command>"
|
|
(HTTP) Specifies a custom request method to use when communicating with the
|
|
HTTP server. The specified request will be used instead of the method
|
|
otherwise used (which defaults to GET). Read the HTTP 1.1 specification for
|
|
details and explanations. Common additional HTTP requests include PUT and
|
|
DELETE, but related technologies like WebDAV offers PROPFIND, COPY, MOVE and
|
|
more.
|
|
|
|
(FTP)
|
|
Specifies a custom FTP command to use instead of LIST when doing file lists
|
|
with FTP.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
|
|
.IP "--xattr"
|
|
When saving output to a file, this option tells curl to store certain file
|
|
metadata in extened file attributes. Currently, the URL is stored in the
|
|
xdg.origin.url attribute and, for HTTP, the content type is stored in
|
|
the mime_type attribute. If the file system does not support extended
|
|
attributes, a warning is issued.
|
|
|
|
.IP "-y, --speed-time <time>"
|
|
If a download is slower than speed-limit bytes per second during a speed-time
|
|
period, the download gets aborted. If speed-time is used, the default
|
|
speed-limit will be 1 unless set with -Y.
|
|
|
|
This option controls transfers and thus will not affect slow connects etc. If
|
|
this is a concern for you, try the \fI--connect-timeout\fP option.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-Y, --speed-limit <speed>"
|
|
If a download is slower than this given speed (in bytes per second) for
|
|
speed-time seconds it gets aborted. speed-time is set with -y and is 30 if
|
|
not set.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-z, --time-cond <date expression>"
|
|
(HTTP/FTP/FILE) Request a file that has been modified later than the given time
|
|
and date, or one that has been modified before that time. The date expression
|
|
can be all sorts of date strings or if it doesn't match any internal ones, it
|
|
tries to get the time from a given file name instead! See the
|
|
\fIcurl_getdate(3)\fP man pages for date expression details.
|
|
|
|
Start the date expression with a dash (-) to make it request for a document
|
|
that is older than the given date/time, default is a document that is newer
|
|
than the specified date/time.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-h, --help"
|
|
Usage help.
|
|
.IP "-M, --manual"
|
|
Manual. Display the huge help text.
|
|
.IP "-V, --version"
|
|
Displays information about curl and the libcurl version it uses.
|
|
|
|
The first line includes the full version of curl, libcurl and other 3rd party
|
|
libraries linked with the executable.
|
|
|
|
The second line (starts with "Protocols:") shows all protocols that libcurl
|
|
reports to support.
|
|
|
|
The third line (starts with "Features:") shows specific features libcurl
|
|
reports to offer. Available features include:
|
|
.RS
|
|
.IP "IPv6"
|
|
You can use IPv6 with this.
|
|
.IP "krb4"
|
|
Krb4 for FTP is supported.
|
|
.IP "SSL"
|
|
HTTPS and FTPS are supported.
|
|
.IP "libz"
|
|
Automatic decompression of compressed files over HTTP is supported.
|
|
.IP "NTLM"
|
|
NTLM authentication is supported.
|
|
.IP "GSS-Negotiate"
|
|
Negotiate authentication and krb5 for FTP is supported.
|
|
.IP "Debug"
|
|
This curl uses a libcurl built with Debug. This enables more error-tracking
|
|
and memory debugging etc. For curl-developers only!
|
|
.IP "AsynchDNS"
|
|
This curl uses asynchronous name resolves.
|
|
.IP "SPNEGO"
|
|
SPNEGO Negotiate authentication is supported.
|
|
.IP "Largefile"
|
|
This curl supports transfers of large files, files larger than 2GB.
|
|
.IP "IDN"
|
|
This curl supports IDN - international domain names.
|
|
.IP "SSPI"
|
|
SSPI is supported. If you use NTLM and set a blank user name, curl will
|
|
authenticate with your current user and password.
|
|
.IP "TLS-SRP"
|
|
SRP (Secure Remote Password) authentication is supported for TLS.
|
|
.RE
|
|
.SH FILES
|
|
.I ~/.curlrc
|
|
.RS
|
|
Default config file, see \fI-K, --config\fP for details.
|
|
.SH ENVIRONMENT
|
|
The environment variables can be specified in lower case or upper case. The
|
|
lower case version has precedence. http_proxy is an exception as it is only
|
|
available in lower case.
|
|
|
|
Using an environment variable to set the proxy has the same effect as using
|
|
the \fI--proxy\fP option.
|
|
|
|
.IP "http_proxy [protocol://]<host>[:port]"
|
|
Sets the proxy server to use for HTTP.
|
|
.IP "HTTPS_PROXY [protocol://]<host>[:port]"
|
|
Sets the proxy server to use for HTTPS.
|
|
.IP "[url-protocol]_PROXY [protocol://]<host>[:port]"
|
|
Sets the proxy server to use for [url-protocol], where the protocol is a
|
|
protocol that curl supports and as specified in a URL. FTP, FTPS, POP3, IMAP,
|
|
SMTP, LDAP etc.
|
|
.IP "ALL_PROXY [protocol://]<host>[:port]"
|
|
Sets the proxy server to use if no protocol-specific proxy is set.
|
|
.IP "NO_PROXY <comma-separated list of hosts>"
|
|
list of host names that shouldn't go through any proxy. If set to a asterisk
|
|
\&'*' only, it matches all hosts.
|
|
.SH "PROXY PROTOCOL PREFIXES"
|
|
Since curl version 7.21.7, the proxy string may be specified with a
|
|
protocol:// prefix to specify alternative proxy protocols.
|
|
|
|
If no protocol is specified in the proxy string or if the string doesn't match
|
|
a supported one, the proxy will be treated as a HTTP proxy.
|
|
|
|
The supported proxy protocol prefixes are as follows:
|
|
.IP "socks4://"
|
|
Makes it the equivalent of \fI--socks4\fP
|
|
.IP "socks4a://"
|
|
Makes it the equivalent of \fI--socks4a\fP
|
|
.IP "socks5://"
|
|
Makes it the equivalent of \fI--socks5\fP
|
|
.IP "socks5h://"
|
|
Makes it the equivalent of \fI--socks5-hostname\fP
|
|
.SH EXIT CODES
|
|
There are a bunch of different error codes and their corresponding error
|
|
messages that may appear during bad conditions. At the time of this writing,
|
|
the exit codes are:
|
|
.IP 1
|
|
Unsupported protocol. This build of curl has no support for this protocol.
|
|
.IP 2
|
|
Failed to initialize.
|
|
.IP 3
|
|
URL malformed. The syntax was not correct.
|
|
.IP 4
|
|
A feature or option that was needed to perform the desired request was not
|
|
enabled or was explicitly disabled at build-time. To make curl able to do
|
|
this, you probably need another build of libcurl!
|
|
.IP 5
|
|
Couldn't resolve proxy. The given proxy host could not be resolved.
|
|
.IP 6
|
|
Couldn't resolve host. The given remote host was not resolved.
|
|
.IP 7
|
|
Failed to connect to host.
|
|
.IP 8
|
|
FTP weird server reply. The server sent data curl couldn't parse.
|
|
.IP 9
|
|
FTP access denied. The server denied login or denied access to the particular
|
|
resource or directory you wanted to reach. Most often you tried to change to a
|
|
directory that doesn't exist on the server.
|
|
.IP 11
|
|
FTP weird PASS reply. Curl couldn't parse the reply sent to the PASS request.
|
|
.IP 13
|
|
FTP weird PASV reply, Curl couldn't parse the reply sent to the PASV request.
|
|
.IP 14
|
|
FTP weird 227 format. Curl couldn't parse the 227-line the server sent.
|
|
.IP 15
|
|
FTP can't get host. Couldn't resolve the host IP we got in the 227-line.
|
|
.IP 17
|
|
FTP couldn't set binary. Couldn't change transfer method to binary.
|
|
.IP 18
|
|
Partial file. Only a part of the file was transferred.
|
|
.IP 19
|
|
FTP couldn't download/access the given file, the RETR (or similar) command
|
|
failed.
|
|
.IP 21
|
|
FTP quote error. A quote command returned error from the server.
|
|
.IP 22
|
|
HTTP page not retrieved. The requested url was not found or returned another
|
|
error with the HTTP error code being 400 or above. This return code only
|
|
appears if \fI-f, --fail\fP is used.
|
|
.IP 23
|
|
Write error. Curl couldn't write data to a local filesystem or similar.
|
|
.IP 25
|
|
FTP couldn't STOR file. The server denied the STOR operation, used for FTP
|
|
uploading.
|
|
.IP 26
|
|
Read error. Various reading problems.
|
|
.IP 27
|
|
Out of memory. A memory allocation request failed.
|
|
.IP 28
|
|
Operation timeout. The specified time-out period was reached according to the
|
|
conditions.
|
|
.IP 30
|
|
FTP PORT failed. The PORT command failed. Not all FTP servers support the PORT
|
|
command, try doing a transfer using PASV instead!
|
|
.IP 31
|
|
FTP couldn't use REST. The REST command failed. This command is used for
|
|
resumed FTP transfers.
|
|
.IP 33
|
|
HTTP range error. The range "command" didn't work.
|
|
.IP 34
|
|
HTTP post error. Internal post-request generation error.
|
|
.IP 35
|
|
SSL connect error. The SSL handshaking failed.
|
|
.IP 36
|
|
FTP bad download resume. Couldn't continue an earlier aborted download.
|
|
.IP 37
|
|
FILE couldn't read file. Failed to open the file. Permissions?
|
|
.IP 38
|
|
LDAP cannot bind. LDAP bind operation failed.
|
|
.IP 39
|
|
LDAP search failed.
|
|
.IP 41
|
|
Function not found. A required LDAP function was not found.
|
|
.IP 42
|
|
Aborted by callback. An application told curl to abort the operation.
|
|
.IP 43
|
|
Internal error. A function was called with a bad parameter.
|
|
.IP 45
|
|
Interface error. A specified outgoing interface could not be used.
|
|
.IP 47
|
|
Too many redirects. When following redirects, curl hit the maximum amount.
|
|
.IP 48
|
|
Unknown option specified to libcurl. This indicates that you passed a weird
|
|
option to curl that was passed on to libcurl and rejected. Read up in the
|
|
manual!
|
|
.IP 49
|
|
Malformed telnet option.
|
|
.IP 51
|
|
The peer's SSL certificate or SSH MD5 fingerprint was not OK.
|
|
.IP 52
|
|
The server didn't reply anything, which here is considered an error.
|
|
.IP 53
|
|
SSL crypto engine not found.
|
|
.IP 54
|
|
Cannot set SSL crypto engine as default.
|
|
.IP 55
|
|
Failed sending network data.
|
|
.IP 56
|
|
Failure in receiving network data.
|
|
.IP 58
|
|
Problem with the local certificate.
|
|
.IP 59
|
|
Couldn't use specified SSL cipher.
|
|
.IP 60
|
|
Peer certificate cannot be authenticated with known CA certificates.
|
|
.IP 61
|
|
Unrecognized transfer encoding.
|
|
.IP 62
|
|
Invalid LDAP URL.
|
|
.IP 63
|
|
Maximum file size exceeded.
|
|
.IP 64
|
|
Requested FTP SSL level failed.
|
|
.IP 65
|
|
Sending the data requires a rewind that failed.
|
|
.IP 66
|
|
Failed to initialise SSL Engine.
|
|
.IP 67
|
|
The user name, password, or similar was not accepted and curl failed to log in.
|
|
.IP 68
|
|
File not found on TFTP server.
|
|
.IP 69
|
|
Permission problem on TFTP server.
|
|
.IP 70
|
|
Out of disk space on TFTP server.
|
|
.IP 71
|
|
Illegal TFTP operation.
|
|
.IP 72
|
|
Unknown TFTP transfer ID.
|
|
.IP 73
|
|
File already exists (TFTP).
|
|
.IP 74
|
|
No such user (TFTP).
|
|
.IP 75
|
|
Character conversion failed.
|
|
.IP 76
|
|
Character conversion functions required.
|
|
.IP 77
|
|
Problem with reading the SSL CA cert (path? access rights?).
|
|
.IP 78
|
|
The resource referenced in the URL does not exist.
|
|
.IP 79
|
|
An unspecified error occurred during the SSH session.
|
|
.IP 80
|
|
Failed to shut down the SSL connection.
|
|
.IP 82
|
|
Could not load CRL file, missing or wrong format (added in 7.19.0).
|
|
.IP 83
|
|
Issuer check failed (added in 7.19.0).
|
|
.IP 84
|
|
The FTP PRET command failed
|
|
.IP 85
|
|
RTSP: mismatch of CSeq numbers
|
|
.IP 86
|
|
RTSP: mismatch of Session Identifiers
|
|
.IP 87
|
|
unable to parse FTP file list
|
|
.IP 88
|
|
FTP chunk callback reported error
|
|
.IP XX
|
|
More error codes will appear here in future releases. The existing ones
|
|
are meant to never change.
|
|
.SH AUTHORS / CONTRIBUTORS
|
|
Daniel Stenberg is the main author, but the whole list of contributors is
|
|
found in the separate THANKS file.
|
|
.SH WWW
|
|
http://curl.haxx.se
|
|
.SH FTP
|
|
ftp://ftp.sunet.se/pub/www/utilities/curl/
|
|
.SH "SEE ALSO"
|
|
.BR ftp (1),
|
|
.BR wget (1)
|