Download a single file and print the output to standard output (STDOUT) by default
Curl http://www.centos.org
Save the downloaded file to the specified file by using the-o/-o option:
-O: Save the file as a file name specified in the command line
-O: Saves files to local using the default file name in the URL
# Download the file locally and name it mygettext.html Curl-o mygettext.html http://www.gnu.org/software/gettext/manual/gettext.html # Save the file locally and name it gettext.html Curl-o http://www.gnu.org/software/gettext/manual/gettext.html
You can also use the turn character ">" to turn output to output
Get multiple files at the same time
Curl-o Url1-o URL2
If you download multiple files from the same site at the same time, Curl tries to reuse the links (connection).
Redirecting through the-l option
By default, curl does not send HTTP Location headers (redirection). When a requested page is moved to another site, an HTTP loaction is sent
Header as a request, and then redirect the request to the new address.
For example, when accessing Google.com, the address is automatically redirected to the google.com.hk.
Curl http://www.google.com <HTML> <HEAD> <meta http-equiv= content-type "content=" text /html;charset=utf-"> <TITLE> moved</title> </HEAD> <BODY> <H> Moved
The above output indicates that the requested file was transferred to the http://www.google.com.hk.
This can be forced redirection by using the-l option
1 # Let Curl use address redirection, the GOOGLE.COM.HK site will be queried at this time
2 Curl-l http://www.google.com
Breakpoint Continuation
Using the-C option allows you to use breakpoint continuation functions on large files, such as:
# When the file ends the process before the download is complete $ curl-o http://www.gnu.org/software/gettext/manual/gettext.html ############## .% # Continue downloading the file by adding the-C option, the downloaded files will not be downloaded curl-c-o http://www.gnu.org/software/gettext/manual/gettext.html ############### .%
Using network speed limit for curl
Limit the maximum network use of curl through the--limit-rate option
# download Speed Max no more than 1000b/second
Curl--limit-rate 1000b-o http://www.gnu.org/software/gettext/manual/gettext.html
Download the modified file in the specified time
When downloading a file, you can make a judgment on the date of the last modification of the file and download it if it has been modified within the specified date.
This feature can be achieved by using the-Z option:
# If the yy.html file is updated after 2011/12/21, it will be downloaded.
Curl-z 21-dec-11 http://www.example.com/yy.html
Curl Authorization
When accessing a page that requires authorization, you can provide a username and password with the-u option to authorize
Curl-u Username:password URL
# The usual practice is to enter a username at the command line and then prompt for a password to ensure that the password is not compromised when viewing the history
4 curl-u username URL
Downloading files from an FTP server
Curl also supports FTP downloads, and if you specify a file path in the URL rather than a specific file name to download, curl lists all the file names under that directory instead of downloading all the files in that directory.
# list all folders and files under public_html
Curl-u Ftpuser:ftppass-o ftp://ftp_server/public_html/
# download xss.php file
Curl-u Ftpuser:ftppass-o ftp://ftp_server/public_html/xss.php
Uploading files to an FTP server
Upload the specified local file to the FTP server with the-t option
# upload MyFile.txt files to server
curl-u ftpuser:ftppass-t myfile.txt ftp://ftp.testserver.com
# Simultaneously uploading multiple files
curl-u Ftpuser:ftppass-t "{file1,file2}" ftp://ftp.testserver.com
# Save from standard input to the server-specified file
curl-u ftpuser:ftppass- T-ftp://ftp.testserver.com/myfile_1.txt
Get more information
Get more link information by using-V and-trace
Query words by dictionary
# Query The meaning of bash words
Curl Dict://dict.org/d:bash
# List all available dictionaries
Curl Dict://dict.org/show:db
# Query The meaning of bash words in the Foldoc dictionary
Curl Dict://dict.org/d:bash:foldoc
Set up agents for curl
-X option to add agent functionality to curl
# Specify proxy host and port
Curl-x proxysever.test.com:3128 http://google.co.in
Other website finishing
Save and use site cookie information
# Save cookies from the website to sugarcookies file
curl-d sugarcookies http://localhost/sugarcrm/index.php
# using the last saved cookie information
Curl-b sugarcookies http://localhost/sugarcrm/index.php
Passing Request data
The default curl uses a Get method to request data, which passes data directly through the URL
You can specify that the post is used to pass data by--data/-d
# get
Curl-u username Https://api.github.com/user?access_token=XXXXXXXXXX
# POST
Curl-u username--data "Param=value¶m=value" https://api.github.com
# You can also specify a file to pass the contents of the file as data to the server side
Curl--data @filename Https://github.api.com/authorizations
Note: By default, passing the past data in the post mode if there are special characters, the first need to pass the special character escape on the server side, such as the value contains a space, you need to first convert the space to%20, such as:
Curl-d "value%201" http://hostname.com
In the new version of Curl, a new option--data-urlencode is provided, and the parameters provided by this option automatically escape special characters.
Curl--data-urlencode "value 1" http://hostname.com
In addition to using the Get and post protocols, you can also specify other protocols through the-X option, such as:
Curl-i-X DELETE HTTPS://API.GITHUB.CIM
Uploading files
Curl--form "fileupload= @filename. txt" Http://hostname/resource
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