tldr/pages/common/flock.md

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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}}"`