Ensure single instance of a command without leaving stale lock files.

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  • License: GNU Library or Lesser General Public License (LGPL) (LGPL)
  • Author: tengu
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Wrap a command with single to ensure there is at most single instance of the command at a time.

This comes in handy when periodically invoking potentially long-running commands by cron. single avoids the problem of stale lock suffered by lock file approach. Even if the command crashes the lock is cleared.

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