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.
Details here:
http://www.adminschoice.com/docs/crontab.htm
