A default crontab header that will make the life easier for those who don't remember cron fields or keywords.

crontab_header.sh

##  Disable E-mail notifications
#MAILTO=""
##  Set where to look for executable files
#PATH=/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/sbin:/usr/local/bin:$PATH
##
##  Entry      Equivalent  Description     
##  @yearly    0 0 1 1 *   Run once a year at midnight in the morning of January 1
##  @annually  0 0 1 1 *   Run once a year at midnight in the morning of January 1
##  @monthly   0 0 1 * *   Run once a month at midnight in the morning of the first of the month
##  @weekly    0 0 * * 0   Run once a week at midnight in the morning of Sunday
##  @daily     0 0 * * *   Run once a day at midnight
##  @hourly    0 * * * *   Run once an hour at the beginning of the hour
##  @reboot                Run at startup
##
##	┌──────────────────────────────────────	min (0 - 59)
##	│	┌──────────────────────────────	hour (0 - 23)
##	│	│	┌──────────────────────	day of month (1 - 31)
##	│	│	│	┌──────────────	month (1 - 12)
##	│	│	│	│	┌──────	day of week (0 - 7) (0 or 7 are Sunday, or use names)
##	┴	┴	┴	┴	┴
##	*	*	*	*	*	command to be executed
## ---------------------------------------------------------------------------------------------
##	0	0	*	*	*	/home/<user>/bin/daily-midnight-script-example.sh