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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 Aug 27 14:16:53 2007
License: GNU General Public License v3 or later
Development Status: 5 - Production/Stable

 

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GNU Parallel 20170322 ('TRAPPIST-1') released
     posted by tange, Tue Mar 21 22:36:09 2017 - 0 replies

GNU Parallel 20170322 ('TRAPPIST-1') has been released. It is available for download at: http://ftpmirror.gnu.org/parallel/

Haiku of the month:

--rpl
used to be a static string
Now it can take args
--ole-tange

New in this release: ...


[Read more]
GNU Parallel 20170222 ('13769') released
     posted by tange, Tue Feb 21 23:31:42 2017 - 0 replies

GNU Parallel 20170222 ('13769') has been released. It is available for download at: http://ftpmirror.gnu.org/parallel/

Haiku of the month:

--tee will pipe
all data to all the jobs
used with --pipe
--ole-tange

New in this release: ...


[Read more]
GNU Parallel 20170122 ('George Michael') released
     posted by tange, Sat Jan 21 17:07:56 2017 - 0 replies

GNU Parallel 20170122 ('George Michael') has been released. It is available for download at: http://ftpmirror.gnu.org/parallel/

Haiku of the month:

Speed is good for you
Multi speed is better still
Use GNU Parallel
-- Ole Tange ...


[Read more]
GNU Parallel 20161222 ('Castro') released
     posted by tange, Thu Dec 22 13:07:42 2016 - 0 replies

GNU Parallel 20161222 ('Castro') has been released. It is available for download at: http://ftpmirror.gnu.org/parallel/

Haiku of the month:

CSV is great:
Simple format to import.
Use --results
-- Ole Tange

  • --results foo.csv will save output as a CSV-file. Can be directly imported into R or LibreCalc. ...

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