Command = crontab
Aka = Task Scheduler (Windows)
Utility = Schedule frequent task

Command line :

delorimier:/# crontab sample.cron

Sample output :

[No Output]

Sample Crontab file "sample.cron":

1 * * * * echo "I am your first crontab!" > /dev/stderr

Usage :

usage:  crontab [-u user] file
        crontab [-u user] { -e | -l | -r }
                (default operation is replace, per 1003.2)
        -e      (edit user's crontab)
        -l      (list user's crontab)
        -r      (delete user's crontab)

Note :

Format of crontab file :
	M  H  d  m  w  C

	M = minute
	H = hour
	d = day of month
	m = month        0-12 (or names)
	w = day of week  0-7  (0 or 7 is Sun, or use names)
	C = the command to execute