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Sunday, 17 September 2017

lockfile Linux Command


lockfile [options] filenames
Create semaphore file(s), used to limit access to a file. When lockfile fails to create some of the specified files, it pauses for eight seconds and retries the last one on which it failed. The command processes flags as they are encountered (i.e., a flag that is specified after a file will not affect that file). This command is most often used by scripts and applications as a way to avoid multiple users changing the same file at once.


Number of seconds lockfile waits before retrying after a failed creation attempt. Default is 8.

Invert return value. Useful in shell scripts.

-l lockout_time
Time (in seconds) after a lockfile was last modified at which it will be removed by force. See also -s.

-ml, -mu
If the permissions on the system mail spool directory allow it or if lockfile is suitably setgid, lockfile can lock and unlock your system mailbox with the options -ml and -mu, respectively.

-r retries
Stop trying to create files after this many retries. The default is -1 (never stop trying). When giving up, remove all created files.

-s suspend_time
After a lockfile has been removed by force (see -l), a suspension of 16 seconds takes place by default. (This is intended to prevent the inadvertent immediate removal of any lockfile newly created by another program.) Use -s to change the default suspend time.
Annamalai Thangaraj

Annamalai is working as Technical Lead in Leading Telecom company with 5+ years experience in Identity and Access Management , Telecom and Networks, BigData, Java, Spring, Struts, Hibernate, AngularJS, and Enterprise Web Application Development.

Website: Java Tutorials Corner

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Item Reviewed: lockfile Linux Command Rating: 5 Reviewed By: Annamalai Thangaraj