Crontab

crontab

# Example of job definition:
# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  * user-name command to be executed


Every minute
*/1 * * * * date >> /home/al/crondate

Every hour first minute
01 * * * * date >> /home/al/crondate

Every day at 4:02am
02 4 * * * date >> /home/al/crondate

Every Sunday at 4:22am
22 4 * * 0 date >> /home/al/crondate

Every First of the month at 4:42 am
42 4 1 * * date >> /home/al/crondate