03. Handling Crontab Outputs

When running cron jobs, you'll often have some output. If you have a mail client installed, it will send to the email address. If not, it will be sent to /dev/null (aka be discarded). either to standard out or error. You can redirect this to your e-mail.

Mailing output

By default, the output to a cron job will be mailed to whoever owns the process, or whatever the MAILTO variable is set as.

To mail the output to someone else, pipe and use the mail command.

00 * * * * echo "Hello! How are you this hour?" | mail -s "subject of mail" username@example.com

Trashing the output

If you don't want to email altogether, redirect to /dev/null, which is a folder that essentially acts as a trash bin.

0 * * * * echo "No need for this message." >> /dev/null

Appending to a log file

We may also append to a log file, or to both standard out and error by redirecting it.

0 * * * * echo "redirect" >> log.file
0 * * * * echo "redirect" >> log.file 2>&1

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