A curl is a tool that can be used to transfer data from or to a server. It supports multiple protocols. According to its man page, the following protocols are supported DICT, FILE, FTP, FTPS, GOPHER, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, and TFTP.

As you can imagine, you can do a lot with these. As you probably figured it out, curl supports proxies, user authentication, FTP upload/download, file transfer resume and many many more.

Here are some examples of using curl:
Download a file:

$ curl -O
Download a file to output file by your choice:
$ curl -o
To resume an interrupted download you can use:

$ curl -C – O
You can check more useful curl examples here: 15 Tips on how to use curl in Linux.

To install curl, you can use:

$ sudo apt install curl # Debian/Ubuntu

yum install curl # CentOS/RHEL

dnf install curl # Fedora

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