How to find the curl Command in Linux and What Can You Do With It?

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How to find the curl Command in Linux and What Can You Do With It? – Guide

The curl command on Linux is a great way to automate the process of uploading and downloading data from a server. Curl supports all major protocols like HTTP, HTTPS, SFTP, FTP and more.

Features such as pausing and resuming transfers, limiting bandwidth, proxy support and user authentication make it a perfect command line utility for data transfer.

Let’s take a deep dive and explore what curl and how to use the.

What is the curl command?

Curl was initially developed to automate the downloading of exchange rates from a web page periodically. Real-time exchange rates provided Swedish Krona equivalents in US dollars for IRC users. Curl’s popularity grew exponentially as people started using its widespread applications.

Curl is one of the oldest and most popular open source projects that have ever existed. The name stands for Customer URL and is used in numerous systems around the world. Curl finds its use in a variety of applications such as web development and bug testing.

Developers don’t need to type commands manually; they can group them into scripts and use them to automate complex operations. Here are some examples of how to use curl.

Installing curl on Linux

Although this popular package comes pre-installed on most Linux distros, you can easily download curl if it isn’t already installed on yours. Use the following commands to install curl on your machine.

On Ubuntu and Debian:

sudo apt install curl

On RHEL-based distros such as CentOS and Fedora:

sudo yum install curl

To install curl on Arch Linux, type:

sudo pacman -S curlHow to use curl command

Curl uses the following syntax for all of its commands

curl options you

… Where the options and url change according to the task at hand. Curl downloads the source code from the URL whenever you don’t mention the option / task. The latest version of curl also guesses the protocol – if not mentioned in the URL – and defaults to HTTP

Here are some useful curl commands to perform various functional tasks

Download a file using cu

You can download resources via a specified URL using curl. This command has two flags you can use; -o and -O

The -O command saves the file in the current directory with the same name as the remote server

The -o command, on the other hand, lets you choose the filename and location

Here is an example of both commands.

curl -O https://cdn.jsdelivr.net/npm/vue/dist/vue.

The file is downloaded into the current directory, with its original name as on the remote server

curl -o newfile.tar.gz http://yourdomain.com/yourfile.tar.

When you run the mentioned command, curl will download and save the file as newfile.tar.gz. Note that you will have to specify the filename and path to the directory as input.

Resume an interrupted download using cu

Downloads can be interrupted for various reasons, such as network outages or an expired link. O feature resuming an interrupted download helps in such situations, avoiding the hassle of downloading the entire file again.

Use the -C flag with -o or -O to resume an interrupted download using cur

curl -C -O http://yourdomain.com/yourfile.tar.

Downloading multiple files using cur

There is no dedicated command for downloading multiple files simultaneously through curl, but you can use the -o or -O flags multiple times in the same command to get similar results

For example

curl -O http://website1.com/file1.iso -O https://website2.com/file2.i

The mentioned command will download ISO files from both URLs simultaneously into the current directory

Get HTTP headers from a Web Pa

HTTP headers contain crucial information such as the user agent, content type and encoding. You can request the HTTP header of a URL using the -I (uppercase I, not L) and -http2 flags

curl -I –http2 https://www.ubuntu.com/:ge.soe:.lgzl..rl.gz.js:.r..rls:.rl:

Specify a maximum transfer rate

File transfers usually take up most of your bandwidth, preventing you from doing anything else.

To solve this problem, you can set a maximum transfer rate for your downloads using curl. Use the –limit-rate method followed by the ak, m or g modifier (denotes kilobytes, megabytes or gigabytes, respectively).

The following command restricts the transfer speed to 1 MBps:

curl –limit-rate 1m -O https://dl.google

Transfer files via FTP and curl

You can transfer files using the File Transfer Protocol by accessing any FTP server using curl. Curl provides the functionality to download and upload files after connecting to the FTP server.

Use the following command to connect to an FTP server:

curl -u username: password ftp://ftp.example.com/

… Where username and password are the credentials for logging into the server.

You can download any file from the server by specifying the file’s URL in the following command:

curl -u username: password -O ftp://ftp.example.com/file.tar.gz

You can also upload files to the FTP server using the -T flag:

curl -T newfile.tar.gz -u username: password ftp://ftp.example.com

The -T command followed by the specified file uploads to the FTP server.

Final note

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