Triggering a function when error occurs in bash script

Question

How can I trigger a function when a command in bash returns an exit code of 1? I know set -e at the top will just make my code terminate, but I want to call this function first. If the code runs ok I want it to exit normally without the function being called. I don't want to do a $? check after every line. I'm sure there's an easy way to do this but I'm new to bash scripting so I don't know it offhand.

chepner · Accepted Answer · 2013-06-12 15:45:01Z

4

Set a trap on the ERR pseudosignal:

set -e
error_handler () {
    # do stuff here
}

trap error_handler ERR

answered Jun 12, 2013 at 15:45

chepner

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2 Comments

Kvass Over a year ago

So the ERR pseudosignal is fired any time a 1 exit status is returned from a failed command?

chepner Over a year ago

Almost any time. There are a few exceptions that make sense (if the failed command is not the last command in an && or || list, for example).

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