docs/cmdline-opts/page-header - platform/external/curl - Git at Google

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 .\" *                                  _   _ ____  _
 .\" *  Project                     ___| | | |  _ \| |
 .\" *                             / __| | | | |_) | |
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
 .\" * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
 .\" * are also available at https://curl.se/docs/copyright.html.
 .\" *
 .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 .\" * copies of the Software, and permit persons to whom the Software is
 .\" * furnished to do so, under the terms of the COPYING file.
 .\" *
 .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 .\" * KIND, either express or implied.
 .\" *
 .\" **************************************************************************
 .\"
 .\" DO NOT EDIT. Generated by the curl project gen.pl man page generator.
 .\"
 .TH curl 1 "16 Dec 2016" "Curl 7.52.0" "Curl Manual"
 .SH NAME
 curl \- transfer a URL
 .SH SYNOPSIS
 .B curl [options / URLs]
 .SH DESCRIPTION
 .B curl
 is a tool to transfer data from or to a server, using one of the supported
 protocols (DICT, FILE, FTP, FTPS, GOPHER, HTTP, HTTPS, IMAP, IMAPS, LDAP,
 LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP,
 SMTPS, TELNET or TFTP). The command is designed to work without user
 interaction.

 curl offers a busload of useful tricks like proxy support, user
 authentication, FTP upload, HTTP post, SSL connections, cookies, file transfer
 resume and more. As you will see below, the number of features will make your
 head spin!

 curl is powered by libcurl for all transfer-related features. See
 *libcurl(3)* for details.
 .SH URL
 The URL syntax is protocol-dependent. You'll find a detailed description in
 RFC 3986.

 You can specify multiple URLs or parts of URLs by writing part sets within
 braces and quoting the URL as in:

   "http://site.{one,two,three}.com"

 or you can get sequences of alphanumeric series by using [] as in:

   "ftp://ftp.example.com/file[1-100].txt"

   "ftp://ftp.example.com/file[001-100].txt"    (with leading zeros)

   "ftp://ftp.example.com/file[a-z].txt"

 Nested sequences are not supported, but you can use several ones next to each
 other:

   "http://example.com/archive[1996-1999]/vol[1-4]/part{a,b,c}.html"

 You can specify any amount of URLs on the command line. They will be fetched
 in a sequential manner in the specified order. You can specify command line
 options and URLs mixed and in any order on the command line.

 You can specify a step counter for the ranges to get every Nth number or
 letter:

   "http://example.com/file[1-100:10].txt"

   "http://example.com/file[a-z:2].txt"

 When using [] or {} sequences when invoked from a command line prompt, you
 probably have to put the full URL within double quotes to avoid the shell from
 interfering with it. This also goes for other characters treated special, like
 for example '&', '?' and '*'.

 Provide the IPv6 zone index in the URL with an escaped percentage sign and the
 interface name. Like in

   "http://[fe80::3%25eth0]/"

 If you specify URL without protocol:// prefix, curl will attempt to guess what
 protocol you might want. It will then default to HTTP but try other protocols
 based on often-used host name prefixes. For example, for host names starting
 with "ftp." curl will assume you want to speak FTP.

 curl will do its best to use what you pass to it as a URL. It is not trying to
 validate it as a syntactically correct URL by any means but is instead
 **very** liberal with what it accepts.

 curl will attempt to re-use connections for multiple file transfers, so that
 getting many files from the same server will not do multiple connects /
 handshakes. This improves speed. Of course this is only done on files
 specified on a single command line and cannot be used between separate curl
 invocations.
 .SH OUTPUT
 If not told otherwise, curl writes the received data to stdout. It can be
 instructed to instead save that data into a local file, using the --output or
 --remote-name options. If curl is given multiple URLs to transfer on the
 command line, it similarly needs multiple options for where to save them.

 curl does not parse or otherwise "understand" the content it gets or writes as
 output. It does no encoding or decoding, unless explicitly asked to with
 dedicated command line options.
 .SH PROTOCOLS
 curl supports numerous protocols, or put in URL terms: schemes. Your
 particular build may not support them all.
 .IP DICT
 Lets you lookup words using online dictionaries.
 .IP FILE
 Read or write local files. curl does not support accessing file:// URL
 remotely, but when running on Microsoft Windows using the native UNC approach
 will work.
 .IP FTP(S)
 curl supports the File Transfer Protocol with a lot of tweaks and levers. With
 or without using TLS.
 .IP GOPHER
 Retrieve files.
 .IP HTTP(S)
 curl supports HTTP with numerous options and variations. It can speak HTTP
 version 0.9, 1.0, 1.1, 2 and 3 depending on build options and the correct
 command line options.
 .IP IMAP(S)
 Using the mail reading protocol, curl can "download" emails for you. With or
 without using TLS.
 .IP LDAP(S)
 curl can do directory lookups for you, with or without TLS.
 .IP MQTT
 curl supports MQTT version 3. Downloading over MQTT equals "subscribe" to a
 topic while uploading/posting equals "publish" on a topic. MQTT support is
 experimental and TLS based MQTT is not supported (yet).
 .IP POP3(S)
 Downloading from a pop3 server means getting a mail. With or without using
 TLS.
 .IP RTMP(S)
 The Realtime Messaging Protocol is primarily used to server streaming media
 and curl can download it.
 .IP RTSP
 curl supports RTSP 1.0 downloads.
 .IP SCP
 curl supports SSH version 2 scp transfers.
 .IP SFTP
 curl supports SFTP (draft 5) done over SSH version 2.
 .IP SMB(S)
 curl supports SMB version 1 for upload and download.
 .IP SMTP(S)
 Uploading contents to an SMTP server means sending an email. With or without
 TLS.
 .IP TELNET
 Telling curl to fetch a telnet URL starts an interactive session where it
 sends what it reads on stdin and outputs what the server sends it.
 .IP TFTP
 curl can do TFTP downloads and uploads.
 .SH "PROGRESS METER"
 curl normally displays a progress meter during operations, indicating the
 amount of transferred data, transfer speeds and estimated time left, etc. The
 progress meter displays number of bytes and the speeds are in bytes per
 second. The suffixes (k, M, G, T, P) are 1024 based. For example 1k is 1024
 bytes. 1M is 1048576 bytes.

 curl displays this data to the terminal by default, so if you invoke curl to
 do an operation and it is about to write data to the terminal, it
 *disables* the progress meter as otherwise it would mess up the output
 mixing progress meter and response data.

 If you want a progress meter for HTTP POST or PUT requests, you need to
 redirect the response output to a file, using shell redirect (>), --output or
 similar.

 This does not apply to FTP upload as that operation does not spit out any
 response data to the terminal.

 If you prefer a progress "bar" instead of the regular meter, --progress-bar is
 your friend. You can also disable the progress meter completely with the
 --silent option.
 .SH OPTIONS
 Options start with one or two dashes. Many of the options require an
 additional value next to them.

 The short "single-dash" form of the options, -d for example, may be used with
 or without a space between it and its value, although a space is a recommended
 separator. The long "double-dash" form, --data for example, requires a space
 between it and its value.

 Short version options that don't need any additional values can be used
 immediately next to each other, like for example you can specify all the
 options -O, -L and -v at once as -OLv.

 In general, all boolean options are enabled with --**option** and yet again
 disabled with --**no-**option. That is, you use the exact same option name
 but prefix it with "no-". However, in this list we mostly only list and show
 the --option version of them. (This concept with --no options was added in
 7.19.0. Previously most options were toggled on/off through repeated use of
 the same command line option.)
	.\" **************************************************************************
	.\" * _ _ ____ _
	.\" * Project ___\| \| \| \| _ \\| \|
	.\" * / __\| \| \| \| \|_) \| \|
	.\" * \| (__\| \|_\| \| _ <\| \|___
	.\" * \___\|\___/\|_\| \_\_____\|
	.\" *
	.\" * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, et al.
	.\" *
	.\" * This software is licensed as described in the file COPYING, which
	.\" * you should have received as part of this distribution. The terms
	.\" * are also available at https://curl.se/docs/copyright.html.
	.\" *
	.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
	.\" * copies of the Software, and permit persons to whom the Software is
	.\" * furnished to do so, under the terms of the COPYING file.
	.\" *
	.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
	.\" * KIND, either express or implied.
	.\" *
	.\" **************************************************************************
	.\"
	.\" DO NOT EDIT. Generated by the curl project gen.pl man page generator.
	.\"
	.TH curl 1 "16 Dec 2016" "Curl 7.52.0" "Curl Manual"
	.SH NAME
	curl \- transfer a URL
	.SH SYNOPSIS
	.B curl [options / URLs]
	.SH DESCRIPTION
	.B curl
	is a tool to transfer data from or to a server, using one of the supported
	protocols (DICT, FILE, FTP, FTPS, GOPHER, HTTP, HTTPS, IMAP, IMAPS, LDAP,
	LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP,
	SMTPS, TELNET or TFTP). The command is designed to work without user
	interaction.

	curl offers a busload of useful tricks like proxy support, user
	authentication, FTP upload, HTTP post, SSL connections, cookies, file transfer
	resume and more. As you will see below, the number of features will make your
	head spin!

	curl is powered by libcurl for all transfer-related features. See
	libcurl(3) for details.
	.SH URL
	The URL syntax is protocol-dependent. You'll find a detailed description in
	RFC 3986.

	You can specify multiple URLs or parts of URLs by writing part sets within
	braces and quoting the URL as in:

	"http://site.{one,two,three}.com"

	or you can get sequences of alphanumeric series by using [] as in:

	"ftp://ftp.example.com/file[1-100].txt"

	"ftp://ftp.example.com/file[001-100].txt" (with leading zeros)

	"ftp://ftp.example.com/file[a-z].txt"

	Nested sequences are not supported, but you can use several ones next to each
	other:

	"http://example.com/archive[1996-1999]/vol[1-4]/part{a,b,c}.html"

	You can specify any amount of URLs on the command line. They will be fetched
	in a sequential manner in the specified order. You can specify command line
	options and URLs mixed and in any order on the command line.

	You can specify a step counter for the ranges to get every Nth number or
	letter:

	"http://example.com/file[1-100:10].txt"

	"http://example.com/file[a-z:2].txt"

	When using [] or {} sequences when invoked from a command line prompt, you
	probably have to put the full URL within double quotes to avoid the shell from
	interfering with it. This also goes for other characters treated special, like
	for example '&', '?' and '*'.

	Provide the IPv6 zone index in the URL with an escaped percentage sign and the
	interface name. Like in

	"http://[fe80::3%25eth0]/"

	If you specify URL without protocol:// prefix, curl will attempt to guess what
	protocol you might want. It will then default to HTTP but try other protocols
	based on often-used host name prefixes. For example, for host names starting
	with "ftp." curl will assume you want to speak FTP.

	curl will do its best to use what you pass to it as a URL. It is not trying to
	validate it as a syntactically correct URL by any means but is instead
	very liberal with what it accepts.

	curl will attempt to re-use connections for multiple file transfers, so that
	getting many files from the same server will not do multiple connects /
	handshakes. This improves speed. Of course this is only done on files
	specified on a single command line and cannot be used between separate curl
	invocations.
	.SH OUTPUT
	If not told otherwise, curl writes the received data to stdout. It can be
	instructed to instead save that data into a local file, using the --output or
	--remote-name options. If curl is given multiple URLs to transfer on the
	command line, it similarly needs multiple options for where to save them.

	curl does not parse or otherwise "understand" the content it gets or writes as
	output. It does no encoding or decoding, unless explicitly asked to with
	dedicated command line options.
	.SH PROTOCOLS
	curl supports numerous protocols, or put in URL terms: schemes. Your
	particular build may not support them all.
	.IP DICT
	Lets you lookup words using online dictionaries.
	.IP FILE
	Read or write local files. curl does not support accessing file:// URL
	remotely, but when running on Microsoft Windows using the native UNC approach
	will work.
	.IP FTP(S)
	curl supports the File Transfer Protocol with a lot of tweaks and levers. With
	or without using TLS.
	.IP GOPHER
	Retrieve files.
	.IP HTTP(S)
	curl supports HTTP with numerous options and variations. It can speak HTTP
	version 0.9, 1.0, 1.1, 2 and 3 depending on build options and the correct
	command line options.
	.IP IMAP(S)
	Using the mail reading protocol, curl can "download" emails for you. With or
	without using TLS.
	.IP LDAP(S)
	curl can do directory lookups for you, with or without TLS.
	.IP MQTT
	curl supports MQTT version 3. Downloading over MQTT equals "subscribe" to a
	topic while uploading/posting equals "publish" on a topic. MQTT support is
	experimental and TLS based MQTT is not supported (yet).
	.IP POP3(S)
	Downloading from a pop3 server means getting a mail. With or without using
	TLS.
	.IP RTMP(S)
	The Realtime Messaging Protocol is primarily used to server streaming media
	and curl can download it.
	.IP RTSP
	curl supports RTSP 1.0 downloads.
	.IP SCP
	curl supports SSH version 2 scp transfers.
	.IP SFTP
	curl supports SFTP (draft 5) done over SSH version 2.
	.IP SMB(S)
	curl supports SMB version 1 for upload and download.
	.IP SMTP(S)
	Uploading contents to an SMTP server means sending an email. With or without
	TLS.
	.IP TELNET
	Telling curl to fetch a telnet URL starts an interactive session where it
	sends what it reads on stdin and outputs what the server sends it.
	.IP TFTP
	curl can do TFTP downloads and uploads.
	.SH "PROGRESS METER"
	curl normally displays a progress meter during operations, indicating the
	amount of transferred data, transfer speeds and estimated time left, etc. The
	progress meter displays number of bytes and the speeds are in bytes per
	second. The suffixes (k, M, G, T, P) are 1024 based. For example 1k is 1024
	bytes. 1M is 1048576 bytes.

	curl displays this data to the terminal by default, so if you invoke curl to
	do an operation and it is about to write data to the terminal, it
	disables the progress meter as otherwise it would mess up the output
	mixing progress meter and response data.

	If you want a progress meter for HTTP POST or PUT requests, you need to
	redirect the response output to a file, using shell redirect (>), --output or
	similar.

	This does not apply to FTP upload as that operation does not spit out any
	response data to the terminal.

	If you prefer a progress "bar" instead of the regular meter, --progress-bar is
	your friend. You can also disable the progress meter completely with the
	--silent option.
	.SH OPTIONS
	Options start with one or two dashes. Many of the options require an
	additional value next to them.

	The short "single-dash" form of the options, -d for example, may be used with
	or without a space between it and its value, although a space is a recommended
	separator. The long "double-dash" form, --data for example, requires a space
	between it and its value.

	Short version options that don't need any additional values can be used
	immediately next to each other, like for example you can specify all the
	options -O, -L and -v at once as -OLv.

	In general, all boolean options are enabled with --option and yet again
	disabled with --no-option. That is, you use the exact same option name
	but prefix it with "no-". However, in this list we mostly only list and show
	the --option version of them. (This concept with --no options was added in
	7.19.0. Previously most options were toggled on/off through repeated use of
	the same command line option.)