crontab

@reboot	    Run once, at startup.
@yearly	    Run once a year, "0 0 1 1 *".
@annually   (same as @yearly)
@monthly	Run once a month, "0 0 1 * *".
@weekly	    Run once a week, "0 0 * * 0".
@daily	    Run once a day, "0 0 * * *".
@midnight   (same as @daily)
@hourly	    Run once an hour, "0 * * * *".

# run five minutes after midnight, every day
5 0 * * *       $HOME/bin/daily.job >> $HOME/tmp/out 2>&1
# run at 2:15pm on the first of every month -- output mailed to paul
15 14 1 * *     $HOME/bin/monthly
# run at 10 pm on weekdays, annoy Joe
0 22 * * 1-5    mail -s "It's 10pm" joe%Joe,%%Where are your kids?%
23 0-23/2 * * * echo "run 23 minutes after midn, 2am, 4am ..., everyday"
5 4 * * sun     echo "run at 5 after 4 every sunday"

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