• Controlling WHEN jobs are executed can maximize efficiency
• Using cron & at, CPU-hog jobs can be run in off-hours
• crontab command is used to edit cron entries: crontab -e
• format of crontab entries:
  MINUTE HOUR DAY MONTH DAYOFWEEK COMMAND
  15 5 * * * /root/backup.bash # runs the backup script at 0515 every day
  30 2 * * 3 /root/wedjob.bash # runs the wednesday job script 0230, weds
• cron checks every minute to see if the crontabs have changed, and if so, if jobs need to be run
• /etc/cron.allow, /etc/cron.deny
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