Log output from a cronjob to a file, but also e-mail if a string is found

some_cronjobed_script.sh 2>&1 | tee -a output.log | grep -C 1000 ERROR
The large context number (-C 1000) is a bit of a hack, but in most of my use cases, it makes sure I'll see the whole log output.

-1
2009-03-06 17:51:13

What Others Think

I thought you wanted to mail it? What if the log is greater than 1000 lines? What's ERROR? some_cronjobed_script.sh 2>&1 | tee -a output.log | mail -s "some subject" some.address@example.com
atoponce · 505 weeks and 3 days ago
Cron can be configured to automatically e-mail the STDOUT results of any commands run to $MAILTO. This can be great, but sometimes, you only want to get an e-mail if something went wrong. That is what this script does. It logs the output to a file for archive purposes, but if the string "ERROR" is found in the output, the output goes to STDOUT as well which means cron will e-mail it. I suppose you could use a subshell or called script that logged the output to the file then grepped the file and catted it if the grep returned true, but this was a oneliner and that was convenient for me.
DEinspanjer · 500 weeks and 1 day ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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