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GNU Parallel 20110422 ('Libya') released

Item posted by Ole Tange <tange> on Fri Apr 22 13:02:15 2011.

GNU Parallel 20110422 ('Libya') has been released. It is available for download at:

New in this release:

  • {#} now works an alias for $PARALLEL_PID.
  • --eta now estimates way more accurately.
  • CPU detection code for AIX thanks to Christian Netrwal.
  • --joblog contains exitcode.
  • Thanks to Ævar Arnfjörð Bjarmason for reading my code.
  • GNU Parallel was presented at:

- LUGA, Augsburg, 2011-03-26,
-, Aarhus, 2011-04-12

  • First example of using GNU Parallel in Hebrew. Thanks to omry.
  • 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 can be 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. A job can also be a command that reads from a pipe. GNU Parallel can then split the input and pipe it into commands in parallel.

If you use xargs and tee 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.

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

When using GNU Parallel for a publication please cite:

O. Tange (2011): GNU Parallel - The Command-Line Power Tool, ;login: The USENIX Magazine, February 2011:42-47.


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