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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.youtub ... tch?v=OpaiGYxkSuQ

Go through the tutorial http://www.gnu.or ... lel_tutorial.html or
see the man page or https://www.gnu.o ... rgument-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 20251022 ('Goodall') released [stable]
     posted by tange, Thu 30 Oct 2025 10:58:26 PM UTC

GNU Parallel 20251022 ('Goodall') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  idk who built GNU parallel but I owe them a beer
    -- ram @h4x0r1ng

New in this release: [...]

GNU Parallel 20250922 ('Iryna Zarutska') released [stable]
     posted by tange, Mon 22 Sep 2025 07:53:05 PM UTC

GNU Parallel 20250922 ('Iryna Zarutska') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  GNU parallel is awesome. Use it more often in your scripts!
    -- Wade @WadeGrimshire@twitter [...]

GNU Parallel 20250822 ('Петропавловск') released [stable]
     posted by tange, Mon 25 Aug 2025 07:09:04 PM UTC

GNU Parallel 20250822 ('Петропавловск') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  gnuparallel is sacred Unix magic
    -- Dr. Dylan Beaudette, Soil Scientis ‪@dylanbeaudette.bsky.social [...]

GNU Parallel 20250722 ('Fordow') released [stable]
     posted by tange, Mon 21 Jul 2025 09:48:09 PM UTC

GNU Parallel 20250722 ('Fordow') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  My party trick is Map/Reduce with GNU Parallel XD
    -- Paweł Lasek @pawel_lasek@twitter [...]

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