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System Name: parallel
Name: GNU Parallel - build and execute command lines from standard input in parallel
Group Type: Official GNU software

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This project is part of the GNU Project.

NAME

parallel - build and execute shell command lines from standard input in parallel

DESCRIPTION

GNU parallel is a shell tool for executing jobs concurrently locally or using remote computers. A job is typically a single command or a small script that has to be run for each of the lines in the input. The typical input is a list of files, a list of hosts, a list of users, a list of URLs, or a list of tables.

If you use xargs today you will find GNU parallel very easy to use as GNU parallel is written to have the same options as xargs. If you write loops in shell, you will find GNU parallel may be able to replace most of the loops and make them run faster by running several jobs simultaneously.

GNU parallel makes sure output from the commands is the same output as you would get had you run the commands sequentially. This makes it possible to use output from GNU parallel as input for other programs.

For each line of input GNU parallel will execute command with the line as arguments. If no command is given, the line of input is executed. Several lines will be run in parallel. GNU parallel can often be used as a substitute for xargs or cat | bash.

Before looking at the options you may want to check out the examples after the list of options. That will give you an idea of what GNU parallel is capable of.

EXAMPLES

You may want to watch the intro video for a quick introduction: http://www.youtube.com/watch?v=OpaiGYxkSuQ

Go through the tutorial http://www.gnu.org/software/parallel/parallel_tutorial.html or
see the man page or http://www.gnu.org/software/parallel/man.html#example__working_as_xargs__n1__argument_appending for more examples.

Registration Date: Mon 27 Aug 2007 02:16:53 PM UTC
License: GNU General Public License v3 or later
Development Status: 5 - Production/Stable

 

Latest News 
GNU Parallel 20141022 ('Shellshock') released
     posted by tange, Wed 22 Oct 2014 08:23:35 PM UTC - 0 replies

GNU Parallel 20141022 ('Shellshock') has been released. It is available for download at: http://ftp.gnu.org/gnu/parallel/

Shellshock has also hit GNU Parallel. It is not a security issue, per se (the security issue was in Bash), but Bash's solution affects --env when exporting a function. ...


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GNU Parallel 20140922 ('Scotland') released
     posted by tange, Mon 22 Sep 2014 05:35:01 PM UTC - 0 replies

GNU Parallel 20140922 ('Scotland') has been released. It is available for download at: http://ftp.gnu.org/gnu/parallel/

Haiku of the month:

bash for loops vanquished
jobs fan out over network
collated results!

New in this release: ...


[Read more]
GNU Parallel 20140822 ('Williams') released
     posted by tange, Fri 22 Aug 2014 10:43:00 PM UTC - 0 replies

GNU Parallel 20140822 ('Williams') has been released. It is available for download at: http://ftp.gnu.org/gnu/parallel/

Haiku of the month:

code fork headache blues?
option P is your new friend
`man parallel` now!
-- Malcolm Cook ...


[Read more]
GNU Parallel 20140815alpha released
     posted by tange, Thu 14 Aug 2014 10:29:59 PM UTC - 0 replies

GNU Parallel 20140815alpha has been released. It is available for download at: http://alpha.gnu.org/gnu/parallel/

New in this release:

  • GNU Parallel now uses the same shell it was started from as the command shell for local jobs. So if GNU ...

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