Question

4

How to control output from crontab?

rated 0 times [ 4] [ 0] / answers: 1 / hits: 6284 / 1 Year ago, sun, december 4, 2022, 8:35:47

I am trying to run a test case via automation testing (sahi) , so I am running it repeatedly after 1 hour (via crontab).

What I want is that whenever my test case fails i should receive the email otherwise not. Right now I am receiving mail whether it passes or fails.

In short, can I send mail to a person depending upon the output I get in terminal.

I am using Ubuntu 10.10.

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imberst

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answered 1 Year ago fatuatexen · Accepted Answer

Pipelineing works in cron just as well as in bash. You could pipe the output to a script, that examines it and sends the mail. Or even easier use grep:

# in /etc/crontab



[email protected]

SHELL=/bin/bash



# m h dom mon dow user      command

30  * *   *   *   confus    /home/confus/bin/someCommand.sh | grep -A 11 -B 10 "Error:"

This will send an e-mail to [email protected] when the stirng "Error: " occures in the output of someCommand.sh. In this case the text of the e-mail will be the output from 10 lines before and 11 lines after the occurrence of "Error: " (hence the -A for after and -B for before).

The mail is only send if the computer running cron has a working mail-server installed. A script to process the output is of course more flexible and considerably more work.