curl: Transfer data or interact with servers using various protocols
August 9th, 2024 11:28 AM Mr. Q Categories: Command
Command: curl
Used to transfer data or interact with servers using various protocols, including HTTP, HTTPS, FTP, and more. curl is highly versatile for sending and receiving data from a server.
Sample Command and Output:
$ curl http://example.com
<!doctype html>
<html>
<head>
<title>Example Domain</title>
</head>
<body>
<p>This domain is for use in illustrative examples in documents.</p>
</body>
</html>Description:
curl http://example.com: Fetches and displays the content ofhttp://example.com. The command outputs the HTML content of the webpage.
Sample Command and Output:
$ curl -o file.txt http://example.com/file.txtDescription:
curl -o file.txt http://example.com/file.txt: Downloads the file fromhttp://example.com/file.txtand saves it asfile.txtin the current directory. The-ooption specifies the output file name.
Sample Command and Output:
$ curl -I http://example.com
HTTP/1.1 200 OK
Date: Fri, 09 Aug 2024 12:38:00 GMT
Server: Apache/2.4.41 (Ubuntu)
...Description:
curl -I http://example.com: Fetches and displays only the HTTP headers of the response fromhttp://example.com. The-Ioption retrieves header information only.
Sample Command and Output:
$ curl -d "param1=value1¶m2=value2" http://example.com/submitDescription:
curl -d "param1=value1¶m2=value2" http://example.com/submit: Sends a POST request with form data tohttp://example.com/submit. The-doption is used to include data in the POST request body.
Sample Command and Output:
$ curl -u user:password http://example.com/protectedDescription:
curl -u user:password http://example.com/protected: Performs an HTTP request with basic authentication using the provided username and password. The-uoption specifies the credentials.
Additional Arguments:
- -L: Follows redirects if the requested URL has been moved to another location.
- -s: Operates in silent mode, suppressing progress and error messages.
Sample Command and Output:
$ curl -L -s http://example.com/redirectDescription:
curl -L -s http://example.com/redirect: Follows any redirects fromhttp://example.com/redirectand operates in silent mode, suppressing the usual output.