Tip: Easier Linux crontab Editing
Corntab for CrontabsScheduled jobs are a basic server administrator task. Joe Brockmeier shows an easy way to use crontab, the Linux job scheduler.
Never memorize what you can look up. This is one of the essential rules of system administration, and it applies very well to creating crontab entries. If you're not an expert on cron, don't worry -- just use the Corntab site or iPhone app.
Generally speaking, cron syntax is not hard to remember. You have five fields to specify the minute, hour, day of the month, month of the year, and/or day of the week that you want to run a job automatically. It seems straightforward, but plenty of users and admins get it wrong -- not because it's really difficult, but just because it's not something they do often enough to memorize the correct syntax for oddball times.
Read the rest of this Linux system administration story at ServerWatch.