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GNU Parallel 20110122 released

Item posted by Ole Tange <tange> on Sat 22 Jan 2011 10:56:20 PM UTC.

GNU Parallel 20110122 has been released. It is available for download at:

New in this release:

  • --joblog makes a simple log of completed jobs.
  • -X now spreads arguments between job slots when reaching last argument. Use -j1 to avoid this.
  • People on the email list have voted -j+0 to be the new default instead of -j9.
  • Bug fixes and man page updates.

About GNU Parallel

GNU Parallel is a shell tool for executing jobs in parallel using one or more 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 in parallel. If you use ppss or pexec you will find GNU Parallel will often make the command easier to read.

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.

You can find more about GNU Parallel at:

Watch the intro video on or at and


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