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My scripts have as first instruction:
set -e
So that whenever an error occurs, the script aborts. I would like to trap this situation to show an information message, but I do not want to show that message whenever the script exits; ONLY when set -e triggers the abortion. Is it possible to trap this situation?
This:
set -e
function mytrap {
echo "Abnormal termination!"
}
trap mytrap EXIT
error
echo "Normal termination"
Is called in any exit (whether an error happens or not), which is not what I want.
429
To set a trap in Bash, use trap followed by a list of commands you want to be executed, followed by a list of signals to trigger it. For complex actions, you can simplify trap statements with Bash functions.
set -o pipefail causes a pipeline (for example, curl -s https://sipb.mit.edu/ | grep foo ) to produce a failure return code if any command errors. Normally, pipelines only return a failure if the last command errors. In combination with set -e , this will make your script exit if any command in a pipeline errors.
Instead of using trap on EXIT, use it on ERR event:
trap mytrap ERR
Full Code:
set -e
function mytrap {
echo "Abnormal termination!"
}
trap mytrap ERR
(($#)) && error
echo "Normal termination"
Now run it for error generation:
bash sete.sh 123
sete.sh: line 9: error: command not found
Abnormal termination!
And here is normal exit:
bash sete.sh
Normal termination
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