crontab is the configuration file for the cron program, which is a
scheduler.
Every minute, cron checks the crontab file to see if there's anything
there that should be launched.
the crontab format is like:
Minutes Hours DayOfMonth Months DayOfWeek Command
so
22 3 * * * updatedb
means that every day, even on weekends, the updatedb command will run
at 3:22 AM.
cron is great for doing repeated tasks, especially file maintenance,
backups, etc. I use the following crontab entry to delete any
TrackStat backups older than 4 days:
10 3 * * * find /mnt/jukebox/playlist/ts/*.xml -mtime +4 -exec rm {} \;
crontab -l
will list the crontab file
crontab -e
allows you to edit the crontab file
crontab -r
will remove the crontab file for the current user account
I don't usually edit crontab directly. What I do is us a separate file
for editing, called root.cron. I make all crontab changes to this file
using the nano editor, then load it into crontab with the command:
crontab root.cron
hope this helps
--
Pale Blue Ego
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