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flock:tldr:88093
This command is using the flock
utility in Unix-based systems to acquire an exclusive lock on a specified file or resource, execute a command, and release the lock afterward.
Here is how the different parts of the command work:
-
${path-to-lock-lock}
: This should be replaced with the path to the lock file or resource you want to acquire exclusive access to. -
--nonblock
: This flag instructsflock
to not wait if the lock is currently held by another process. Instead, it will exit immediately with a specific exit code (${error_code}
) indicating a conflict. -
--conflict-exit-code ${error_code}
: This flag sets the exit code forflock
when a conflict occurs.${error_code}
should be replaced with an actual numeric value that you want to use as the exit code. -
-c "${command}"
: This is the command that will be executed while holding the lock.${command}
should be replaced with the actual command you want to run within the lock.
In summary, this command attempts to acquire a lock on a specified file, runs a command in that locked state, and exits immediately with a specific exit code if the lock is already held by another process.