平常有玩終端機，curl本來就是UNIX的下載套件，身邊的人使用蘋果的也慢慢多了起來，不希望玩MAC只限於GUI介面，
它是個好系統...更是一個培養學習電腦的好幫手，重點就是看你怎麼去用它囉，不過前提是請把Windows的觀念先丟掉，
玩終端機介面時最好對於Unix-like的權限管理啊..檔案架構啊這些有點了解比較好。
這一篇介紹會比較落落長， 除了介紹curl的使用方法外，也會大概介紹一下終端機怎麼使用，不過只是基本而已；
在應用程式裡面有個工具程式，工具程式裡有個終端機～沒錯就是它..點擊兩下打開，ok...這邊我們先介紹怎麼切斷目錄，
沒錯,跟DOS一樣，cd 路徑，
預設的環境變數底下，滑鼠游標前面會有個$號，所以下面的範例如果要打指令時，都會以$開頭。
假設我們桌面有個叫做abc的資料夾，而我們要切換到那邊的話，我們就打：
$ cd ~/Desktop/abc 或者 直接打cd Desktop/abc
前者跟後者的差異我們講解一下，前面是絕對路徑，這個方式不論你目前在那個資料夾都可以到你要的位置，而~的意思就是你的家目錄，
後者叫做相對路徑，代表著你現在的目錄下的Desktop資料夾裡的abc資料夾；
ls這個指令就是list的意思，主要是用來看目前目錄的檔案
pwd這個指令是顯示你目前目錄的路徑
請記住，在這些系統裡的檔案檔名是有分大小寫的喔，假設你有abc這個資料夾，而目前的路徑底下a開頭的也只有這個檔案，
按下tab就會補字，也就是會幫你補上bc囉，可以節省許多輸入時間。
好啦..其他的東西就先不介紹，再來我們講curl，
1.基本下載
2.批次下載
3.檔案續傳下載
4.分割下載
5.上傳檔案
1.$ curl -O "http://123.com/123.txt"
大概的語法就是這樣，如果你希望抓下來的123.txt直接可以改成tutorial.tx的話，可以下以下的指令
$ curl -O "tutorial.txt" "http://123.com/123.txt"
2.假設我們要抓的檔案是某個網址上的1.txt,2.txt一直到10.txt，我們可以這樣下指令
$ curl -O "http://123.com/[1-10].txt"
其實這是正規表示法的應用，對它有興趣的可以在網路先看看參考資料。
3.當你在抓一個檔案時，例如1.txt，但是抓到一半斷線了，這時我們請加上一個參數-c，範例如下
$ curl -c -o "1.txt" "http://123.com/"
4.這個指令有點麻煩，之前在網路上有看過一個shell來簡化，不過暫時找不到，所謂的分割檔案下載就跟Flashget裡問你要分成幾個點來下載是一樣的，不過在這邊先不介紹，免得會有更多的問題。
5.% curl -T "123.txt" -u user:password "ftp://123.com/file/1.txt"
-u後面的user:password就是你上傳空間的帳號密碼。
奇怪...怎麼越打到後面越沒力XD，可能是想到要教學的資料東西實在太多了，反正最近想要學習cocoa，試試看能不能寫出一個以curl為基礎的下載軟體，功能一定不夠=.=...不過可以免除終端機輸入的問題，祝福我吧...(另外cocoa中文化真的不難，但是我想不到中文化時要怎麼支援中文顯示的變數，試著去中文化Teamspeak是成功了..可惜中文顯示名稱這個問題還是沒有解決，這部份可能有編碼及原始碼和伺服端的問題，暫時不考慮！！！）
以下是curl的manpage，供大家參考：
curl(1) Curl Manual curl(1)
NNAAMMEE
curl - transfer a URL
SSYYNNOOPPSSIISS
ccuurrll [[ooppttiioonnss]] _[_U_R_L_._._._]
DDEESSCCRRIIPPTTIIOONN
ccuurrll is a tool to transfer data from or to a server, using one of the
supported protocols (HTTP, HTTPS, FTP, FTPS, GOPHER, DICT, TELNET, LDAP
or FILE). The command is designed to work without user interaction.
curl offers a busload of useful tricks like proxy support, user authen-
tication, ftp upload, HTTP post, SSL (https:) connections, cookies,
file transfer resume and more. As you will see below, the amount of
features will make your head spin!
curl is powered by libcurl for all transfer-related features. See
lliibbccuurrll(3) for details.
UURRLL
The URL syntax is protocol dependent. You'll find a detailed descrip-
tion in RFC 2396.
You can specify multiple URLs or parts of URLs by writing part sets
within braces as in:
http://site.{one,two,three}.com
or you can get sequences of alphanumeric series by using [] as in:
ftp://ftp.numericals.com/file[1-100].txt
ftp://ftp.numericals.com/file[001-100].txt (with leading zeros)
ftp://ftp.letters.com/file[a-z].txt
No nesting of the sequences is supported at the moment, but you can use
several ones next to each other:
http://any.org/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.
Curl will attempt to re-use connections for multiple file transfers, so
that getting many files from the same server will not do multiple con-
nects / 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 invokes.
OOPPTTIIOONNSS
-a/--append
(FTP) When used in an FTP upload, this will tell curl to append
to the target file instead of overwriting it. If the file
doesn't exist, it will be created.
If this option is used twice, the second one will disable append
mode again.
-A/--user-agent
(HTTP) Specify the User-Agent string to send to the HTTP server.
Some badly done CGIs fail if its not set to "Mozilla/4.0". To
encode blanks in the string, surround the string with single
quote marks. This can also be set with the _-_H_/_-_-_h_e_a_d_e_r option
of course.
If this option is set more than once, the last one will be the
one that's used.
--anyauth
(HTTP) Tells curl to figure out authentication method by itself,
and use the most secure one the remote site claims it supports.
This is done by first doing a request and checking the response-
headers, thus inducing an extra network round-trip. This is used
instead of setting a specific authentication method, which you
can do with _-_-_b_a_s_i_c, _-_-_d_i_g_e_s_t, _-_-_n_t_l_m, and _-_-_n_e_g_o_t_i_a_t_e. (Added
in 7.10.6)
Note that using --anyauth is not recommended if you do uploads
from stdin, since it may require data to be sent twice and then
the client must be able to rewind. If the need should arise when
uploading from stdin, the upload operation will fail.
If this option is used several times, the following occurrences
make no difference.
-b/--cookie
(HTTP) Pass the data to the HTTP server as a cookie. It is sup-
posedly the data previously received from the server in a "Set-
Cookie:" line. The data should be in the format "NAME1=VALUE1;
NAME2=VALUE2".
If no '=' letter is used in the line, it is treated as a file-
name to use to read previously stored cookie lines from, which
should be used in this session if they match. Using this method
also activates the "cookie parser" which will make curl record
incoming cookies too, which may be handy if you're using this in
combination with the _-_L_/_-_-_l_o_c_a_t_i_o_n option. The file format of
the file to read cookies from should be plain HTTP headers or
the Netscape/Mozilla cookie file format.
NNOOTTEE that the file specified with _-_b_/_-_-_c_o_o_k_i_e is only used as
input. No cookies will be stored in the file. To store cookies,
use the _-_c_/_-_-_c_o_o_k_i_e_-_j_a_r option or you could even save the HTTP
headers to a file using _-_D_/_-_-_d_u_m_p_-_h_e_a_d_e_r!
If this option is set more than once, the last one will be the
one that's used.
-B/--use-ascii
Enable ASCII transfer when using FTP or LDAP. For FTP, this can
also be enforced by using an URL that ends with ";type=A". This
option causes data sent to stdout to be in text mode for win32
systems.
If this option is used twice, the second one will disable ASCII
usage.
--basic
(HTTP) Tells curl to use HTTP Basic authentication. This is the
default and this option is usually pointless, unless you use it
to override a previously set option that sets a different
authentication method (such as _-_-_n_t_l_m, _-_-_d_i_g_e_s_t and _-_-_n_e_g_o_t_i_-
_a_t_e). (Added in 7.10.6)
If this option is used several times, the following occurrences
make no difference.
--ciphers
(SSL) Specifies which ciphers to use in the connection. The list
of ciphers must be using valid ciphers. Read up on SSL cipher
list details on this URL:
_h_t_t_p_:_/_/_w_w_w_._o_p_e_n_s_s_l_._o_r_g_/_d_o_c_s_/_a_p_p_s_/_c_i_p_h_e_r_s_._h_t_m_l
If this option is used several times, the last one will override
the others.
--compressed
(HTTP) Request a compressed response using one of the algorithms
libcurl supports, and return the uncompressed document. If this
option is used and the server sends an unsupported encoding,
Curl will report an error.
If this option is used several times, each occurrence will tog-
gle it on/off.
--connect-timeout
Maximum time in seconds that you allow the connection to the
server to take. This only limits the connection phase, once
curl has connected this option is of no more use. See also the
_-_m_/_-_-_m_a_x_-_t_i_m_e option.
If this option is used several times, the last one will be used.
-c/--cookie-jar
Specify to which file you want curl to write all cookies after a
completed operation. Curl writes all cookies previously read
from a specified file as well as all cookies received from
remote server(s). If no cookies are known, no file will be writ-
ten. The file will be written using the Netscape cookie file
format. If you set the file name to a single dash, "-", the
cookies will be written to stdout.
NNOOTTEE If the cookie jar can't be created or written to, the whole
curl operation won't fail or even report an error clearly. Using
-v will get a warning displayed, but that is the only visible
feedback you get about this possibly lethal situation.
If this option is used several times, the last specified file
name will be used.
-C/--continue-at
Continue/Resume a previous file transfer at the given offset.
The given offset is the exact number of bytes that will be
skipped counted from the beginning of the source file before it
is transferred to the destination. If used with uploads, the
ftp server command SIZE will not be used by curl.
Use "-C -" to tell curl to automatically find out where/how to
resume the transfer. It then uses the given output/input files
to figure that out.
If this option is used several times, the last one will be used.
--create-dirs
When used in conjunction with the -o option, curl will create
the necessary local directory hierarchy as needed. This option
creates the dirs mentioned with the -o option, nothing else. If
the -o file name uses no dir or if the dirs it mentions already
exist, no dir will be created.
To create remote directories when using FTP, try _-_-_f_t_p_-_c_r_e_a_t_e_-
_d_i_r_s.
--crlf (FTP) Convert LF to CRLF in upload. Useful for MVS (OS/390).
If this option is used twice, the second will again disable crlf
converting.
-d/--data
(HTTP) Sends the specified data in a POST request to the HTTP
server, in a way that can emulate as if a user has filled in a
HTML form and pressed the submit button. Note that the data is
sent exactly as specified with no extra processing (with all
newlines cut off). The data is expected to be "url-encoded".
This will cause curl to pass the data to the server using the
content-type application/x-www-form-urlencoded. Compare to
_-_F_/_-_-_f_o_r_m. If this option is used more than once on the same
command line, the data pieces specified will be merged together
with a separating &-letter. Thus, using '-d name=daniel -d
skill=lousy' would generate a post chunk that looks like
'name=daniel&skill=lousy'.
If you start the data with the letter @, the rest should be a
file name to read the data from, or - if you want curl to read
the data from stdin. The contents of the file must already be
url-encoded. Multiple files can also be specified. Posting data
from a file named 'foobar' would thus be done with _-_-_d_a_t_a @foo-
bar".
To post data purely binary, you should instead use the _-_-_d_a_t_a_-
_b_i_n_a_r_y option.
_-_d_/_-_-_d_a_t_a is the same as _-_-_d_a_t_a_-_a_s_c_i_i.
If this option is used several times, the ones following the
first will append data.
--data-ascii
(HTTP) This is an alias for the _-_d_/_-_-_d_a_t_a option.
If this option is used several times, the ones following the
first will append data.
--data-binary
(HTTP) This posts data in a similar manner as _-_-_d_a_t_a_-_a_s_c_i_i does,
although when using this option the entire context of the posted
data is kept as-is. If you want to post a binary file without
the strip-newlines feature of the _-_-_d_a_t_a_-_a_s_c_i_i option, this is
for you.
If this option is used several times, the ones following the
first will append data.
--digest
(HTTP) Enables HTTP Digest authentication. This is a authentica-
tion that prevents the password from being sent over the wire in
clear text. Use this in combination with the normal _-_u_/_-_-_u_s_e_r
option to set user name and password. See also _-_-_n_t_l_m, _-_-_n_e_g_o_t_i_-
_a_t_e and _-_-_a_n_y_a_u_t_h for related options. (Added in curl 7.10.6)
If this option is used several times, the following occurrences
make no difference.
--disable-eprt
(FTP) Tell curl to disable the use of the EPRT and LPRT commands
when doing active FTP transfers. Curl will normally always first
attempt to use EPRT, then LPRT before using PORT, but with this
option, it will use PORT right away. EPRT and LPRT are exten-
sions to the original FTP protocol, may not work on all servers
but enable more functionality in a better way than the tradi-
tional PORT command. (Added in 7.10.5)
If this option is used several times, each occurrence will tog-
gle this on/off.
--disable-epsv
(FTP) Tell curl to disable the use of the EPSV command when
doing passive FTP transfers. Curl will normally always first
attempt to use EPSV before PASV, but with this option, it will
not try using EPSV.
If this option is used several times, each occurrence will tog-
gle this on/off.
-D/--dump-header
Write the protocol headers to the specified file.
This option is handy to use when you want to store the headers
that a HTTP site sends to you. Cookies from the headers could
then be read in a second curl invoke by using the _-_b_/_-_-_c_o_o_k_i_e
option! The _-_c_/_-_-_c_o_o_k_i_e_-_j_a_r option is however a better way to
store cookies.
When used on FTP, the ftp server response lines are considered
being "headers" and thus are saved there.
If this option is used several times, the last one will be used.
-e/--referer
(HTTP) Sends the "Referer Page" information to the HTTP server.
This can also be set with the _-_H_/_-_-_h_e_a_d_e_r flag of course. When
used with _-_L_/_-_-_l_o_c_a_t_i_o_n you can append ";auto" to the referer
URL to make curl automatically set the previous URL when it fol-
lows a Location: header. The ";auto" string can be used alone,
even if you don't set an initial referer.
If this option is used several times, the last one will be used.
--engine
Select the OpenSSL crypto engine to use for cipher operations.
Use _-_-_e_n_g_i_n_e _l_i_s_t to print a list of build-time supported
engines. Note that not all (or none) of the engines may be
available at run-time.
--environment
(RISC OS ONLY) Sets a range of environment variables, using the
names the -w option supports, to easier allow extraction of use-
ful information after having run curl.
If this option is used several times, each occurrence will tog-
gle this on/off.
--egd-file
(HTTPS) 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 _-_-_r_a_n_d_o_m_-_f_i_l_e option.
-E/--cert
(HTTPS) Tells curl to use the specified certificate file when
getting a file with HTTPS. The certificate must be in PEM for-
mat. If the optional password isn't specified, it will be
queried for on the terminal. Note that this certificate is the
private key and the private certificate concatenated!
If this option is used several times, the last one will be used.
--cert-type
(SSL) Tells curl what certificate type the provided certificate
is in. PEM, DER and ENG are recognized types.
If this option is used several times, the last one will be used.
--cacert
(HTTPS) Tells curl to use the specified certificate file to ver-
ify the peer. The file may contain multiple CA certificates. The
certificate(s) must be in PEM format.
curl recognizes the environment variable named 'CURL_CA_BUNDLE'
if that 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 direc-
tory as curl.exe, or in the Current Working Directory, or in any
folder along your PATH.
If this option is used several times, the last one will be used.
--capath
(HTTPS) Tells curl to use the specified certificate directory to
verify the peer. The certificates must be in PEM format, and the
directory must have been processed using the c_rehash utility
supplied with openssl. Using _-_-_c_a_p_a_t_h can allow curl to make
https connections much more efficiently than using _-_-_c_a_c_e_r_t if
the _-_-_c_a_c_e_r_t file contains many CA certificates.
If this option is used several times, the last one will be used.
-f/--fail
(HTTP) Fail silently (no output at all) on server errors. This
is mostly done like this 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 a HTML document stating
so (which often also describes why and more). This flag will
prevent curl from outputting that and fail silently instead.
If this option is used twice, the second will again disable
silent failure.
--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 pre-
vious use.
--ftp-create-dirs
(FTP) When an FTP URL/operation uses a path that doesn't cur-
rently exist on the server, the standard behavior of curl is to
fail. Using this option, curl will instead attempt to create
missing directories. (Added in 7.10.7)
If this option is used twice, the second will again disable
silent failure.
--ftp-pasv
(FTP) Use PASV when transfering. PASV is the internal default
behavior, but using this option can be used to override a previ-
ous --ftp-port option. (Added in 7.11.0)
If this option is used twice, the second will again disable
silent failure.
--ftp-ssl
(FTP) Make the FTP connection switch to use SSL/TLS. (Added in
7.11.0)
If this option is used twice, the second will again disable
this.
-F/--form
(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 RFC1867.
This enables uploading of binary files etc. To force the 'con-
tent' 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 letter <. 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 'pass-
word' is the name of the form-field to which /etc/passwd will be
the input:
ccuurrll -F password=@/etc/passwd www.mypasswords.com
To read the file's content from stdin instead of a file, use -
where the file name should've been. This goes for both @ and <
constructs.
You can also tell curl what Content-Type to use by using
'type=', in a manner similar to:
ccuurrll -F "web=@index.html;type=text/html" url.com
or
ccuurrll -F "name=daniel;type=text/foo" url.com
You can also explicitly change the name field of an file upload
part by setting filename=, like this:
ccuurrll -F "file=@localfile;filename=nameinpost" url.com
See further examples and details in the MANUAL.
This option can be used multiple times.
-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.
-G/--get
When used, this option will make all data specified with
_-_d_/_-_-_d_a_t_a or _-_-_d_a_t_a_-_b_i_n_a_r_y 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 used multiple times, nothing special happens.
-h/--help
Usage help.
-H/--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 trick-
ier stuff than curl would normally do. You should not replace
internally set headers without knowing perfectly well what
you're doing. Replacing an internal header with one without con-
tent on the right side of the colon will prevent that header
from appearing.
See also the _-_A_/_-_-_u_s_e_r_-_a_g_e_n_t and _-_e_/_-_-_r_e_f_e_r_e_r options.
This option can be used multiple times to add/replace/remove
multiple headers.
-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...
If this option is used twice, the second will again disable
header include.
--interface
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.
-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.
If this option is used twice, the second will again disable
header only.
-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. (Added in 7.9.7)
If this option is used several times, each occurrence will tog-
gle this on/off.
-k/--insecure
(SSL) This option explicitly allows curl to perform "insecure"
SSL connections and transfers. Starting with curl 7.10, all SSL
connections will be attempted to be made secure by using the CA
certificate bundle installed by default. This makes all connec-
tions considered "insecure" to fail unless _-_k_/_-_-_i_n_s_e_c_u_r_e is
used.
If this option is used twice, the second time will again disable
it.
--key
(SSL) 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.
--key-type
(SSL) Private key file type. Specify which type your _-_-_k_e_y pro-
vided private key is. DER, PEM and ENG are supported.
If this option is used several times, the last one will be used.
--krb4
(FTP) Enable kerberos4 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 that the library was built with kerberos4
support. This is not very common. Use _-_V_/_-_-_v_e_r_s_i_o_n to see if
your curl supports it.
If this option is used several times, the last one will be used.
-K/--config
Specify which config file to read curl arguments from. The con-
fig 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 speci-
fied on the same config file line. If the parameter is to con-
tain white spaces, the parameter must be inclosed within quotes.
If the first column of a config line is a '#' character, the
rest of the line will be treated as a comment.
Specify the filename 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 _-_-_u_r_l 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/"
This option can be used multiple times.
--limit-rate
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 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 kilo-
bytes, 'm' or M' makes it megabytes while 'g' or 'G' makes it
gigabytes. Examples: 200K, 3m and 1G.
If you are also using the _-_Y_/_-_-_s_p_e_e_d_-_l_i_m_i_t option, that option
will take precedence and might cripple the rate-limiting
slightly, to help keeping the speed-limit logic working.
This option was introduced in curl 7.10.
If this option is used several times, the last one will be used.
-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.
If this option is used twice, the second will again disable list
only.
-L/--location
(HTTP/HTTPS) If the server reports that the requested page has a
different location (indicated with the header line Location:)
this flag will let curl attempt to reattempt the get on the new
place. If used together with _-_i_/_-_-_i_n_c_l_u_d_e or _-_I_/_-_-_h_e_a_d, headers
from all requested pages will be shown. If authentication is
used, curl will only send its credentials to the initial host,
so if a redirect takes curl to a different host, it won't inter-
cept the user+password. See also _-_-_l_o_c_a_t_i_o_n_-_t_r_u_s_t_e_d on how to
change this.
If this option is used twice, the second will again disable
location following.
--location-trusted
(HTTP/HTTPS) Like _-_L_/_-_-_l_o_c_a_t_i_o_n, 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
do a site to which you'll send your authentication info (which
is plaintext in the case of HTTP Basic authentication).
If this option is used twice, the second will again disable
location following.
--max-filesize
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.
NOTE: The file size is not always known prior to download, and
for such files this option has no effect even if the file trans-
fer ends up being larger than this given limit. This concerns
both FTP and HTTP transfers.
-m/--max-time
Maximum time in seconds that you allow the whole operation to
take. This is useful for preventing your batch jobs from hang-
ing for hours due to slow networks or links going down. This
doesn't work fully in win32 systems. See also the _-_-_c_o_n_n_e_c_t_-
_t_i_m_e_o_u_t option.
If this option is used several times, the last one will be used.
-M/--manual
Manual. Display the huge help text.
-n/--netrc
Makes curl scan the _._n_e_t_r_c 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
nneettrrcc((44)) or ffttpp((11)) for details on the file format. Curl will not
complain if that file hasn't the right permissions (it should
not be world nor group readable). The environment variable
"HOME" is used to find the home directory.
A quick and very simple example of how to setup a _._n_e_t_r_c to
allow curl to ftp to the machine host.domain.com with user name
'myself' and password
mmaacchhiinnee hhoosstt..ddoommaaiinn..ccoomm llooggiinn mmyysseellff ppaasssswwoorrdd sseeccrreett
If this option is used twice, the second will again disable
netrc usage.
--netrc-optional
Very similar to _-_-_n_e_t_r_c, but this option makes the .netrc usage
ooppttiioonnaall and not mandatory as the _-_-_n_e_t_r_c does.
--negotiate
(HTTP) Enables GSS-Negotiate authentication. The GSS-Negotiate
method was designed by Microsoft and is used in their web appli-
cations. It is primarily meant as a support for Kerberos5
authentication but may be also used along with another authenti-
cation methods. For more information see IETF draft draft-
brezak-spnego-http-04.txt. (Added in 7.10.6)
This option requires that the library was built with GSSAPI sup-
port. This is not very common. Use _-_V_/_-_-_v_e_r_s_i_o_n to see if your
version supports GSS-Negotiate.
If this option is used several times, the following occurrences
make no difference.
-N/--no-buffer
Disables the buffering of the output stream. In normal work sit-
uations, 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.
If this option is used twice, the second will again switch on
buffering.
--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, reversed engineered by clever peo-
ple 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 authentica-
tion method instead. Such as Digest. (Added in 7.10.6)
If you want to enable NTLM for your proxy authentication, then
use _-_-_p_r_o_x_y_-_n_t_l_m.
This option requires that the library was built with SSL sup-
port. Use _-_V_/_-_-_v_e_r_s_i_o_n to see if your curl supports NTLM.
If this option is used several times, the following occurrences
make no difference.
-o/--output
Write output to
[] to fetch multiple documents, you can use '#' followed by a
number in the
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 you have number of
URLs.
See also the _-_-_c_r_e_a_t_e_-_d_i_r_s option to create the local directo-
ries dynamically.
-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
You may use this option as many times as you have number of
URLs.
--pass
(SSL) Pass phrase for the private key
If this option is used several times, the last one will be used.
--proxy-basic
Tells curl to use HTTP Basic authentication when communicating
with the given proxy. Use _-_-_b_a_s_i_c for enabling HTTP Basic with a
remote host. Basic is the default authentication method curl
uses with proxies.
If this option is used twice, the second will again disable
proxy HTTP Basic authentication.
--proxy-digest
Tells curl to use HTTP Digest authentication when communicating
with the given proxy. Use _-_-_d_i_g_e_s_t for enabling HTTP Digest with
a remote host.
If this option is used twice, the second will again disable
proxy HTTP Digest.
--proxy-ntlm
Tells curl to use HTTP NTLM authentication when communicating
with the given proxy. Use _-_-_n_t_l_m for enabling NTLM with a remote
host.
If this option is used twice, the second will again disable
proxy HTTP NTLM.
-p/--proxytunnel
When an HTTP proxy is used (_-_x_/_-_-_p_r_o_x_y), 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 tun-
nel 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.
If this option is used twice, the second will again disable
proxy tunnel.
-P/--ftp-port
(FTP) Reverses the initiator/listener roles when connecting with
ftp. This switch makes Curl use the PORT command instead of
PASV. In practice, PORT tells the server to connect to the
client's specified address and port, while PASV asks the server
for an ip address and port to connect to. should be
one of:
interface
i.e "eth0" to specify which interface's IP address you
want to use (Unix only)
IP address
i.e "192.168.10.1" to specify exact IP number
host name
i.e "my.host.domain" to specify machine
- (any single-letter string) to make it pick the machine's
default
If this option is used several times, the last one will be used. Dis-
able the use of PORT with _-_-_f_t_p_-_p_a_s_v. Disable the attempt to use the
EPRT command instead of PORT by using _-_-_d_i_s_a_b_l_e_-_e_p_r_t. EPRT is really
PORT++.
-q If used as the first parameter on the command line, the
_$_H_O_M_E_/_._c_u_r_l_r_c file will not be read and used as a config file.
-Q/--quote
(FTP) Send an arbitrary command to the remote FTP server. Quote
commands are sent BEFORE the transfer is taking place (just
after the initial PWD command to be exact). To make commands
take place after a successful transfer, prefix them with a dash
'-'. To make commands get sent after libcurl has changed working
directory, just before the transfer command(s), prefix the com-
mand with '+'. You may specify any amount of commands. If the
server returns failure for one of the commands, the entire oper-
ation will be aborted. You must send syntactically correct FTP
commands as RFC959 defines.
This option can be used multiple times.
--random-file
(HTTPS) 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 _-_-_e_g_d_-_f_i_l_e option.
-r/--range
(HTTP/FTP) Retrieve a byte range (i.e a partial document) from a
HTTP/1.1 or FTP server. Ranges can be specified in a number of
ways.
00--449999 specifies the first 500 bytes
550000--999999 specifies the second 500 bytes
--550000 specifies the last 500 bytes
99550000 specifies the bytes from offset 9500 and forward
00--00,,--11 specifies the first and last byte only(*)(H)
550000--770000,,660000--779999
specifies 300 bytes from offset 500(H)
110000--119999,,550000--559999
specifies two separate 100 bytes ranges(*)(H)
(*) = NOTE that this will cause the server to reply with a multipart
response!
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 range downloads only support the simple syntax 'start-stop'
(optionally with one of the numbers omitted). It depends on the non-RFC
command SIZE.
If this option is used several times, the last one will be used.
-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.
If this option is used twice, the second time disables this
again.
--retry
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 5xx
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 _-_-_r_e_t_r_y_-_d_e_l_a_y
you disable this exponential backoff algorithm. See also
_-_-_r_e_t_r_y_-_m_a_x_-_t_i_m_e to limit the total time allowed for retries.
(Option added in 7.12.3)
If this option is used multiple times, the last occurrence
decide the amount.
--retry-delay
Make curl sleep this amount of time between 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 _-_-_r_e_t_r_y is also used. Setting this delay to
zero will make curl use the default backoff time. (Option added
in 7.12.3)
If this option is used multiple times, the last occurrence
decide the amount.
--retry-max-time
The retry timer is reset before the first transfer attempt.
Retries will be done as usual (see _-_-_r_e_t_r_y) 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 perform-
ing, it may take longer than this given time period. To limit a
single request's maximum time, use _-_m_/_-_-_m_a_x_-_t_i_m_e. Set this
option to zero to not timeout retries. (Option added in 7.12.3)
If this option is used multiple times, the last occurrence
decide the amount.
-s/--silent
Silent mode. Don't show progress meter or error messages. Makes
Curl mute.
If this option is used twice, the second will again disable
mute.
-S/--show-error
When used with -s it makes curl show error message if it fails.
If this option is used twice, the second will again disable show
error.
--socks
Use the specified SOCKS5 proxy. If the port number is not speci-
fied, it is assumed at port 1080. (Option added in 7.11.1)
This option overrides any previous use of _-_x_/_-_-_p_r_o_x_y, as they
are mutually exclusive.
If this option is used several times, the last one will be used.
--stderr
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.
--tcp-nodelay
Turn on the TCP_NODELAY option. See the _c_u_r_l___e_a_s_y___s_e_t_o_p_t_(_3_) man
page for details about this option. (Added in 7.11.2)
If this option is used several times, each occurrence toggles
this on/off.
-t/--telnet-option
Pass options to the telnet protocol. Supported options are:
TTYPE=
XDISPLOC=
NEW_ENV=
-T/--upload-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.
Before 7.10.8, when this option was used several times, the last
one was used.
In curl 7.10.8 and later, 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/
--trace
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.
If this option is used several times, the last one will be used.
(Added in 7.9.7)
--trace-ascii
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 _-_-_t_r_a_c_e, 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.
If this option is used several times, the last one will be used.
(Added in 7.9.7)
-u/--user
Specify user and password to use for server authentication.
Overrides _-_n_/_-_-_n_e_t_r_c and _-_-_n_e_t_r_c_-_o_p_t_i_o_n_a_l.
If this option is used several times, the last one will be used.
-U/--proxy-user
Specify user and password to use for proxy authentication.
If this option is used several times, the last one will be used.
--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 _-_o_/_-_-_o_u_t_p_u_t or the _-_O_/_-_-_r_e_m_o_t_e_-_n_a_m_e
options.
-v/--verbose
Makes the fetching more verbose/talkative. Mostly usable for
debugging. Lines starting with '>' means data sent by curl, '<'
means data received by curl that is hidden in normal cases and
lines starting with '*' means additional info provided by curl.
Note that if you only want HTTP headers in the output,
_-_i_/_-_-_i_n_c_l_u_d_e might be option you're looking for.
If you think this option still doesn't give you enough details,
consider using _-_-_t_r_a_c_e or _-_-_t_r_a_c_e_-_a_s_c_i_i instead.
If this option is used twice, the second will again disable ver-
bose.
-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:
IPv6 You can use IPv6 with this.
krb4 Krb4 for ftp is supported.
SSL HTTPS and FTPS are supported.
libz Automatic decompression of compressed files over HTTP is
supported.
NTLM NTLM authentication is supported.
GSS-Negotiate
Negotiate authentication is supported.
Debug This curl uses a libcurl built with Debug. This enables
more error-tracking and memory debugging etc. For curl-
developers only!
AsynchDNS
This curl uses asynchronous name resolves.
SPNEGO SPNEGO Negotiate authentication is supported.
Largefile
This curl supports transfers of large files, files larger
than 2GB.
IDN This curl supports IDN - international domain names.
-w/--write-out
Defines what to display after a completed and successful opera-
tion. 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 like %{variable_name} and to output
a normal % you just write them like %%. You can output a newline
by using \n, a carriage return with \r and a tab space with \t.
NNOOTTEE:: The %-letter is a special letter in the win32-environment,
where all occurrences of % must be doubled when using this
option.
Available variables are at this point:
uurrll__eeffffeeccttiivvee The URL that was fetched last. This is mostly
meaningful if you've told curl to follow loca-
tion: headers.
hhttttpp__ccooddee The numerical code that was found in the last
retrieved HTTP(S) page.
hhttttpp__ccoonnnneecctt The numerical code that was found in the last
response (from a proxy) to a curl CONNECT
request. (Added in 7.12.4)
ttiimmee__ttoottaall The total time, in seconds, that the full opera-
tion lasted. The time will be displayed with mil-
lisecond resolution.
ttiimmee__nnaammeellooookkuupp
The time, in seconds, it took from the start
until the name resolving was completed.
ttiimmee__ccoonnnneecctt The time, in seconds, it took from the start
until the connect to the remote host (or proxy)
was completed.
ttiimmee__pprreettrraannssffeerr
The time, in seconds, it took from the start
until the file transfer is just about to begin.
This includes all pre-transfer commands and nego-
tiations that are specific to the particular pro-
tocol(s) involved.
ttiimmee__rreeddiirreecctt The time, in seconds, it took for all redirection
steps include name lookup, connect, pretransfer
and transfer before final transaction was
started. time_redirect shows the complete execu-
tion time for multiple redirections. (Added in
7.12.3)
ttiimmee__ssttaarrttttrraannssffeerr
The time, in seconds, it took from the start
until the first byte is just about to be trans-
ferred. This includes time_pretransfer and also
the time the server needs to calculate the
result.
ssiizzee__ddoowwnnllooaadd The total amount of bytes that were downloaded.
ssiizzee__uuppllooaadd The total amount of bytes that were uploaded.
ssiizzee__hheeaaddeerr The total amount of bytes of the downloaded head-
ers.
ssiizzee__rreeqquueesstt The total amount of bytes that were sent in the
HTTP request.
ssppeeeedd__ddoowwnnllooaadd The average download speed that curl measured for
the complete download.
ssppeeeedd__uuppllooaadd The average upload speed that curl measured for
the complete upload.
ccoonntteenntt__ttyyppee The Content-Type of the requested document, if
there was any. (Added in 7.9.5)
nnuumm__ccoonnnneeccttss Number of new connects made in the recent trans-
fer. (Added in 7.12.3)
nnuumm__rreeddiirreeccttss Number of redirects that were followed in the
request. (Added in 7.12.3)
If this option is used several times, the last one will be used.
-x/--proxy
Use specified HTTP proxy. If the port number is not specified,
it is assumed at port 1080.
This option overrides existing environment variables that sets
proxy to use. If there's an environment variable setting a
proxy, you can set proxy to "" to override it.
NNoottee that 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 done with the
_-_p_/_-_-_p_r_o_x_y_t_u_n_n_e_l option.
If this option is used several times, the last one will be used.
-X/--request
(HTTP) Specifies a custom request to use when communicating with
the HTTP server. The specified request will be used instead of
the standard GET. Read the HTTP 1.1 specification for details
and explanations.
(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.
-y/--speed-time
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