The spring of cron jobs

crontab -l
/etc/cron.hourly/*
/etc/cron.daily/*
/etc/cron.weekly/*
/etc/cron.monthly/*
/etc/cron.d/*
/etc/crontab
/var/spool/cron/*

/var/spool/at/*
/etc/anacrontab
/var/spool/anacron/*

# For details see man 4 crontabs
# 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) 
# |  |  |  |  |
# *  *  *  *  * user-name command to be executed