DavidM DavidM - 24 days ago 15
Linux Question

How can I programmatically create a new cron job?

I want to be able to programatically add a new cron job, what is the best way to do this?

From my research, it seems I could dump the current crontab and then append a new one, piping that back into crontab:

(crontab -l ; echo "0 * * * * wget -O - -q http://www.example.com/cron.php") | crontab -


Is there a better way?

Answer

It's always worked well for me.

You should consider a slightly more sophisticated script that can do three things.

  1. Append a crontab line; assuring that it didn't exist. Adding when it already exists is bad.

  2. Remove the crontab line. Perhaps only warning if it didn't exist.

  3. A combination of the above two features to replace the crontab line.

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