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A common thing to do with a shell is making it run as a cronjob to clean up the database once in a while or send newsletters. This is trivial to setup, for example:
*/5 * * * * cd /full/path/to/app && Console/cake myshell myparam
# * * * * * command to execute
# │ │ │ │ │
# │ │ │ │ │
# │ │ │ │ \───── day of week (0 - 6) (0 to 6 are Sunday to Saturday,
# | | | | or use names)
# │ │ │ \────────── month (1 - 12)
# │ │ \─────────────── day of month (1 - 31)
# │ \──────────────────── hour (0 - 23)
# \───────────────────────── min (0 - 59)
You can see more info here: https://en.wikipedia.org/wiki/Cron