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GNU Parallel 20101222 released

Item posted by Ole Tange <tange> on Tue Dec 21 20:27:32 2010.

GNU Parallel 20101222 has been released. It is available for download at:

New in this release:

  • GNU niceload is now part of GNU Parallel. GNU niceload slows down a program if the load average is above a certain limit.
  • Implemented --tmpdir to buffer standard output and standard error in a different place.
  • Implemented --load to wait until the load is below a limit before starting another job on that computer.
  • Implemented --nice set the niceness of jobs running both locally and remotely.
  • Implemented --dry-run to print the job without running it.
  • Implemented --tty as the old default of assigning a tty to the first job causes problems.
  • Quite a few 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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