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curl Command in Linux

curl Command in Linux

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Overview

In this article, we will discuss the curl command in Linux. The curl command is a powerful tool used for transferring data from or to a server. It supports various protocols, including HTTP, FTP, SMTP, and more. It is a command-line tool that can be used to perform different types of operations on URLs.

Linux curl Command Syntax

The syntax for the curl command is as follows:

curl Command Options:

  • -X, --request: Specifies the HTTP request method.
  • -H, --header: Allows to pass additional headers.
  • -d, --data: Sends HTTP POST data.
  • -o, --output: Writes output to a file.
  • -O, --remote-name: Writes output to a file with the same name as the remote file.
  • -I, --head: Shows headers only.
  • -L, --location: Follows redirects.
  • -u, --user: Specifies the user name and password for authentication.
  • -k, --insecure: Allows connections to SSL sites without certificates.
  • -s, --silent: Silent mode.
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Example Usages

  • Downloading a file using curl::

    Explanation: This command downloads a file from the specified URL and saves it in the current directory with the same name as the remote file.

  • Sending POST data using curl::

    Explanation: This command sends a POST request to the specified URL with the given data.

  • Displaying only the response headers using curl::

    Explanation: This command displays only the response headers of the specified URL.

  • Following redirects using curl::

    Explanation: This command follows any redirects that occur while accessing the specified URL.

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Tips

  • You can use the -o option to write the output to a specific file instead of stdout.

  • You can use the -u option to specify a user name and password for server authentication.

Advanced Use Cases of curl Command in Linux

  • Uploading a file using curl::

    Explanation: This command uploads a file to the specified URL using HTTP POST method.

  • Using a proxy server with curl::

    Explanation: This command accesses the specified URL using the specified proxy server and port.

  • Displaying SSL certificate information using curl::

    Explanation: This command displays SSL certificate information while accessing the specified URL.

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1200+Hiring Partners
89%Placement Rate
11,000+Placements
147%Avg Salary Increment
2.5XCareer Growth
₹23 LPAAvg Post-Scaler Salary

Conclusion

  • The curl command is a powerful tool for transferring data to and from a server.

  • It supports various protocols including HTTP, FTP, SMTP, and more.

  • The curl command has many options for customizing requests and responses.

  • It is a command-line tool that is available on most Linux distributions.

  • Curl can be used for downloading files, sending POST data, displaying headers, following redirects, and more.