cron 3.0pl1-105ubuntu1.1 (amd64 binary) in ubuntu jaunty

 cron is a background process (`daemon') that runs programs at regular
 intervals (for example, every minute, day, week or month); which
 processes are run and at what times are specified in the `crontab'.
 .
 Users may also install crontabs so that processes are run on
 their behalf, though this feature can be disabled or restricted to
 particular users.
 .
 Output from the commands is usually mailed to the system administrator
 (or to the user in question); you should probably install a mail system
 as well so that you can receive these messages.
 .
 This cron package is configured by default to do various standard
 system maintenance tasks, such as ensuring that logfiles do not
 grow endlessly and overflow the disk.
 .
 The lockfile-progs package is only a "Suggests" because of the poor
 way that dselect handles "Recommends", but I do strongly suggest that
 you install it; it prevents /etc/cron.daily/standard from running multiple
 times if something gets jammed.