CRON Fields

CRON Fields

# (Use to post in the top of your crontab)
# ------------- minute (0 - 59)
# | ----------- hour (0 - 23)
# | | --------- day of month (1 - 31)
# | | | ------- month (1 - 12)
# | | | | ----- day of week (0 - 6) (Sunday=0)
# | | | | |
# * * * * * command to be executed

* The comma (',') operator specifies a list of values, for example: "1,3,4,7,8"
* The dash ('-') operator specifies a range of values, for example: "1-6", which is equivalent to "1,2,3,4,5,6"
* The asterisk ('*') operator specifies all possible values for a field. For example, an asterisk in the hour time field would be equivalent to 'every hour'..

Source: http://en.wikipedia.org/wiki/Crontab