if you want it to run as a specific user, login as that user, then enter in "crontab -e", though you should be prepared to deal with vi.
the format of the file is as such:
#minute hour mday month wday command
so, to run something on the 30th minute of every day, you would have:
30 /path/command
You can also place it int he systems cron file, by modifying /etc/crontab. The format of this file varies slightly, because you need to specify the user that the command will run as:
#minute hour mday month wday who command
/5 1,5-7 * root /path/command
*Note: specifying /5, like I did for minute, means to execute every 5 minutes. You can also specify a list or a range, like I did under month. The example entry would run /path/command as user root, every 5 minutes, but only for January, May, June & July.
