[patzoul]

This is my first time to use cron. I have updated crontab with the task I want to run. It does not seem to be working. Do I need to restart cron after changing crontab? The path to the command specified in crontab is correct.

[patzoul]

does cron work when the mac is sleeping?

[drmbb2]

After you edit the crontab file, you must execute it with the command

"crontab <name of crontab file>

Cron jobs do not execute while the computer is in sleep mode - NO processes execute as the cpu is idled. However, Cron entries should be preserved as sleep maintains things already resident in RAM. Those jobs should become active again when the computer is awakened. However, if you want them to run all the time, you will have to disable sleep (although, of course, the monitor's power save settings can still be set independently).