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curl command


Transferring data from one place to another is one of the main task done using computers connected to a network. There are so many GUI tools out there to send and receive data, but when you are working on a console, only equipped with command line functionality, using curl is inevitable. A less known fact is that curl can work with a wide range of protocols and can solve most of your scripting tasks with ease.

Haxx is a team of developer consultants offering solutions to programming problems. They offer solutions in the field of Embedded programming, Unix/Linux, Network, Device Drivers, Perl scripts etc. One of the co-founder of Haxx gifted the open-source community with a tool called CURL. The man behind its development is none other than Daniel Stenberg(who is currently a Senior Network Engineer @ Mozilla.)

CURL comes by default installed in most of the distributions. If you do not have curl tool installed, then its a single apt-get(apt-get install curl) or yum(yum install curl) command away. Installing curl will install the curl command line tool as well as libcurl library. On an Ubuntu system the package names are as follows.

  1. curl_7.22.0-3ubuntu4.7_amd64.deb
  2. libcurl3_7.22.0-3ubuntu4.7_amd64.deb

CURL is simply awesome because of the following reasons...
  1. CURL is an easy to use command line tool to send and receive files, and it supports almost all major protocols(DICT, FILE, FTP, FTPS, GOPHER, HTTP, HTTPS,  IMAP, IMAPS,  LDAP,  LDAPS,  POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMTP, SMTPS, TELNET and TFTP) in use.
  2. Can be used inside your shell scripts with ease
  3. Supports features like pause and resume of downloads
  4. It has around 120 command line options for various tasks
  5. It runs on all major operating systems(More than 40+ Operating systems)
  6. Supports cookies, forms and SSL
  7. Both curl command line tool and libcurl library are open source, so they can be used in any of your programs
  8. It supports configuration files
  9. Multiple upload with a single command
  10. Progress bar, rate limiting, and download time details
  11. ipv6 support

And much more. Refer: http://curl.haxx.se/docs/features.html For more feature sets and other details....
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