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Tag selected: cron.
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Saved by uncleflo on February 8th, 2017.
Sometimes there's a need to ensure only one copy of a script runs, i.e prevent two or more copies running simultaneously. Imagine an important cronjob doing something very important, which will fail or corrupt data if two copies of the called program were to run at the same time. To prevent this, a form of MUTEX (mutual exclusion) lock is needed. The basic procedure is simple: The script checks if a specific condition (locking) is present at startup, if yes, it's locked - the scipt doesn't start. This article describes locking with common UNIX® tools. There are other special locking tools available, But they're not standardized, or worse yet, you can't be sure they're present when you want to run your scripts. A tool designed for specifically for this purpose does the job much better than general purpose code.
cron parallel administration development exclusion lock howto ksh run script execute start
Saved by uncleflo on January 24th, 2014.
cron is a unix, solaris utility that allows tasks to be automatically run in the background at regular intervals by the cron daemon. These tasks are often termed as cron jobs in unix , solaris. Crontab (CRON TABle) is a file which contains the schedule of cron entries to be run and at specified times. This document covers following aspects of Unix cron jobs
cron crontab linux setup administration howto explanation guide time schedule command reference manager configuration entry list
Saved by uncleflo on March 27th, 2012.
Setting up cron jobs in Unix and Solaris. cron is a unix, solaris utility that allows tasks to be automatically run in the background at regular intervals by the cron daemon. These tasks are often termed as cron jobs in unix , solaris. Crontab (CRON TABle) is a file which contains the schedule of cron entries to be run and at specified times. This document covers following aspects of Unix cron jobs
cron crontab schedule linux user admin reference quick choice daemon jobs unix time command
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