cron timing cheat sheet

cron_cheat_sheet.txt

#kudos: Alain Kelder

#+--------------- minute (0-59)
#| +------------- hour (0-23)
#| | +----------- day of month (1-31)
#| | | +--------- month (1-12)
#| | | | +------- day of week (0-7), 0=Sunday
#| | | | |     user    command
17 * * * *     root    cd / && run-parts --report /etc/cron.hourly
25 6 * * *     root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6 * * 7     root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6 1 * *     root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
 
# place custom jobs below

# runs script - sends email to root if script fails
*/15 *  * * *   www-data        drush.cron || mail -s "Error $? running $_" root
# runs script - discard standard output - sends email if script fails
*/15 *  * * *   www-data        drush.cron 1>/dev/null || mail -s "Error $? running $_" root