A 'cron job' is a recurring, scheduled job entry on Unix/Linux systems. Consequently, this question should likely be re-categorized to fall under the Linux OS category.
For example, say we have written a nifty little shell script or 'C' program that starts ntpd (Network Time Protocol Daemon) to set the system time accurately and then shuts down the ntp daemon. If we wanted to run our little program twice a day, for instance, at a specific time, we would likely use cron to handle it for us.
Our cron tab entry might look something like the following...
01 06,18 * * * /usr/local/bin/ntpstart.sh
The above entry will run the /usr/local/bin/ntpstart.sh shell script at 1 minute after 06:00 and 1 minute after 18:00 hours, every day of the week, every week of the year. See the man page for 'cron' on your system for more details. [JMH]
A cron job is a time based job scheduler on a computer system.
A cron job is a time oriented planner/organizer. The word cron comes from cronos in greek, meaning time. In other words, its pretty much a planner of some sort. A cron job is preformed at a certain time of the day as it's programmed to.
/var/spool/cron/crontabs/ - cron files of users /var/adm/cron/ - other cron settings
The definition of a cron job is timed scheduler in operating systems such as unix based operating systems. You can get more information about this at the Wikipedia. Once on the website, type "Chron" into the search field at the top of the page and press enter to bring up the information.
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