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Id: 9478
System Name: parallel
Name: GNU Parallel
Group Type: Official GNU software

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This software 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 https://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 rss feed
GNU Parallel 20240122 ('Frederik X') released
     posted by tange, Wed 24 Jan 2024 03:19:35 AM UTC

GNU Parallel 20240122 ('Frederik X') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  GNU Parallel alone provides more value than moreutils
    -- -email is unavailable- [...]

GNU Parallel 20231222 ('Sundhnúkagígur') released
     posted by tange, Sat 23 Dec 2023 06:51:53 PM UTC

GNU Parallel 20231222 ('Sundhnúkagígur') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  Parallel is so damn good! You’ve got to use it.
    -- @ThePrimeTimeagen@youtube.com [...]

GNU Parallel 20231122 ('Grindavík') released
     posted by tange, Thu 23 Nov 2023 10:50:50 PM UTC

GNU Parallel 20231122 ('Grindavík') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  Got around to using GNU parallel for the first time from a suggestion by @jdwasmuth ... now I'm wishing I started using this years ago [...]

GNU Parallel 20231022 ('Al-Aqsa Deluge') released [stable]
     posted by tange, Tue 24 Oct 2023 09:15:42 PM UTC

GNU Parallel 20231022 ('Al-Aqsa Deluge') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  Love to make a dual processor workstation absolutely whir running dozens of analysis scripts at once [...]

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