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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 20230822 ('Chandrayaan') released [stable]
     posted by tange, Thu 24 Aug 2023 04:31:43 AM UTC

GNU Parallel 20230822 ('Chandrayaan') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  GNU parallel is your friend. Unleash your cores! #GNU
    -- Blake L @BlakeDL@twitter

New in this release: [...]

GNU Parallel 20230722 ('Приго́жин') released [stable]
     posted by tange, Sun 23 Jul 2023 12:41:47 PM UTC

GNU Parallel 20230722 ('Приго́жин') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  GNU parallel is the greatest productivity hack of all time.
    -- ashpool @solanobahn@twitter [...]

GNU Parallel 20230622 ('Nova Kakhovka') released [stable]
     posted by tange, Thu 22 Jun 2023 09:03:26 AM UTC

GNU Parallel 20230622 ('Nova Kakhovka') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  gnu parallel is actually like. really easy
    -- tom (era) @slimefiend@twitter

New in this release: [...]

GNU Parallel 20230522 ('Charles') released [stable]
     posted by tange, Mon 22 May 2023 08:31:29 PM UTC

Subject: GNU Parallel 20230522 ('Charles') released [stable]

GNU Parallel 20230522 ('Charles') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  Recently learned how to use GNU parallel (from ChatGPT, no less!) and I've gone mad with power [...]

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