crontab in Linux can schedule certain task to happen automatically at whatever time you specify, then either e-mail when that happens or not if you disable it
crontab working by editing a file that is then run every so often. here is the list of what the fields mean:
The fields are: Min minute of execution, 0-59 Hour hour of execution, 0-23 Mday day of month of execution, 1-31 Month month of execution, 1-12 (or names) Wday day of week of execution, 1-7 (1 = monday, 7 = sunday, or names) Command Anything that can be launched from the command line
If you want cron to ONLY e-mail you if there are errors, change the end of the command to read:
> /dev/null 2>&1 (don't send anything via email) >/dev/null (only send you errors via email)
1 1 * * * /usr/bin/rdate -s tick.greyware.com > /dev/null 2>&1 (sets time every day at 1:01 a.m., but doesn't email you)
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