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

Project description

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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Files for single, version 0.2.0
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