Basic Linux Commands - CentOS
Linux CronTabs, Cron Jobs, Task Schedulers
The crontab is a list of commands that you want to run on a regular schedule, and also the name of the command used to manage that list.
crontab stands for "cron table," because it uses the job scheduler cron to execute tasks; cron itself is named after "chronos," the Greek word for time.
Read more: http://www.computerhope.com/unix/ucrontab.htm
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