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I've run some commands using sem -j <number> <command>. Then I cancelled the whole script.

Now, even after rebooting the machine, I cannot use sem any more, even sem -j 2 "echo HELLO" waits eternally.

How can I clean up the semaphores?

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1 Answer 1

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They are stored in ~/.parallel/semaphores, but they should really clean themselves over time.

Are you running a very old version?

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  • sem --version brings GNU parallel 20181223. Can I delete the directories in semaphores?
    – Bowi
    Commented Jan 21, 2020 at 11:26
  • 1
    You can. It is perfectly safe.
    – Ole Tange
    Commented Jan 21, 2020 at 11:31

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