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Id: #9478
System Name: parallel
Name: GNU 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 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 20220922 ('Elizabeth') released
     posted by tange, Thu 22 Sep 2022 07:49:30 PM UTC - 0 replies

GNU Parallel 20220922 ('Elizabeth') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  reduced our backend test pipelines from 4 to 1.30 hrs. gnu parallel for the win!!!
     -- Swapnil Sahu @CaffeinatedWryy@twitter ...


[Read more]
GNU Parallel 20220822 ('Rushdie') released
     posted by tange, Mon 22 Aug 2022 08:25:43 PM UTC - 0 replies

GNU Parallel 20220822 ('Rushdie') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  Parallel is Good Stuff (tm)
    -- bloopernova@ycombinator

New in this release:

  • --header 0 allows using {filename} as replacement string ...

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GNU Parallel 20220722 ('Roe vs Wade') released
     posted by tange, Sun 24 Jul 2022 07:25:07 AM UTC - 0 replies

GNU Parallel 20220722 ('Roe vs Wade') has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  The syntax for GNU Parallel is so slick that I often use it just to make my script read nicer, and the parallelism is a cherry on top. ...


[Read more]
GNU Parallel 20220622 ('Bongbong') released
     posted by tange, Thu 23 Jun 2022 08:29:39 AM UTC - 0 replies

GNU Parallel 20220622 ('Bongbong') has been released. It is available for download at: http://ftpmirror.gnu.org/parallel/

Quote of the month:

  Parallel has been (and still is) super useful and simple tool for speeding up all kinds of shell tasks during my career. ...


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