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flock

Manage locks from shell scripts.

It can be used to ensure that only one process of a command is running.

More information.

• Run a command with a file lock as soon as the lock is not required by others:

flock {path/to/lock.lock} --command "{command}"

• Run a command with a file lock, and exit if the lock doesn't exist:

flock {path/to/lock.lock} --nonblock --command "{command}"

• Run a command with a file lock, and exit with a specific error code if the lock doesn't exist:

flock {path/to/lock.lock} --nonblock --conflict-exit-code {error_code} -c "{command}"

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