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I prefer to stick scheduled tasks in /etc/crontab so I can see at a glance what's scheduled to run, regardless of which user the task runs as.

The only gotcha is that the format isn't validated on save, unlike crontab -e -- so a stray character can quietly break the entire cron.

Is there a way to validate the /etc/crontab format before/after save?

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If, like me, you came here looking for a simple (non-scriptable) way to tell you whether you'd got your cron entry right, you might be interested in — it's an online validator for cron entries with human-friendly output. – Matt Gibson Dec 20 '14 at 11:18

3 Answers 3

up vote 0 down vote accepted

This has already been answered over on Stack Overflow.

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It should be noted that the answer on Stack Overflow was specifically solving the question with PHP, which may or may not be useful for some people. – Dave Wongillies Aug 30 '13 at 2:17
not the kind of answer I was looking for.. perhaps something which is not specific to php.. anything but a library.. – Gaurav Agarwal Jan 13 '14 at 8:41

Wicked cool shell scripts by Dave Taylor has a shell script that validates crontab files.

You can get the script at the site for the books: verifycron.
Thanks to seth for the hint.

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Source is on the site for the book as well: Really like that book. – seth Jul 21 '09 at 19:58
@seth: Added the link to the answer, thanks. – Ludwig Weinzierl Jul 21 '09 at 20:18

Another more recent solution is the python script chkcrontab

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It doesn't check users' cronjobs yet – userlond Oct 19 at 7:22

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