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Clock Service (Cron)
Cron executes commands at specified dates and times according to the instructions in the file tenon/etc/crontab. Commands may be Perl and Shell scripts, Apple scripts and applications, or any of the UNIX utilities listed in See Appendix G.
The crontab file consists of lines of seven fields each. The fields are separated by spaces or tabs. The first five fields are integer patterns to specify:
day of the month (1-31)
month of the year (1-12)
day of the week (1-7 with 1 = Monday)
Each of these patterns may contain: