Lock file

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File Format
Name Lock file
Ontology
Extension(s) .lck, .lock

Lock files are used to prevent simultaneous access to a specific file, device, or to prevent an application from being started twice. Lock files are found in Unix-like systems under the directory /var/lock (or more recently, /run/lock).

A lock file may be empty, but it usually contains the process ID of the program holding the lock.

Not to be confused with a File lock, although a lock file often has a file lock.

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