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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: https://manned.org/flock.

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}}"