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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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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 or at http://tinyogg.com/watch/TORaR/ and http://tinyogg.com/watch/hfxKj/

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 27 Aug 2007 02:16:53 PM UTC
License: GNU General Public License v3 or later
Development Status: 5 - Production/Stable

 

Latest News 
GNU Parallel 20130422 ('Boston') released
     posted by tange, Sun 21 Apr 2013 09:58:59 PM UTC - 0 replies

GNU Parallel 20130422 ('Boston') has been released. It is available for download at: http://ftp.gnu.org/gnu/parallel/

New in this release:

  • 10 seconds installation: wget -O - pi.dk/3 | sh
  • HPUX CPU/core detection. Thanks to Javier Tarradas. ...

[Read more]
GNU Parallel 20130222 ('Chelyabinsk') released
     posted by tange, Thu 21 Feb 2013 11:05:43 PM UTC - 0 replies

GNU Parallel 20130222 ('Chelyabinsk') has been released. It is available for download at: http://ftp.gnu.org/gnu/parallel/

New in this release:

  • --resume works with --pipe.
  • --resume-failed will go through --joblog, redo the failed jobs and then continue like --resume. ...

[Read more]
GNU Parallel 20130122 ('Jyoti Singh Pandey') released
     posted by tange, Mon 21 Jan 2013 11:08:06 PM UTC - 0 replies

GNU Parallel 20130122 ('Jyoti Singh Pandey') has been released. It is available for download at: http://ftp.gnu.org/gnu/parallel/

New in this release:

  • --sshdelay Delay starting next ssh by secs seconds. GNU parallel will pause secs seconds after starting each ssh. secs can be less than 1 seconds. ...

[Read more]
GNU Parallel 20121222 ('End of The World') released
     posted by tange, Sat 22 Dec 2012 04:29:17 PM UTC - 0 replies

GNU Parallel 20121222 ('End of The World') has been released. It is available for download at: http://ftp.gnu.org/gnu/parallel/

New in this release:

  • --shebang-wrap makes is possible to parallelize scripts by putting parallel in the shebang line (the first #! line in scripts). ...

[Read more]
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