How can I “try to do something and then detect if it fails” in bash?

Question

In an answer to a previous question:

How can I use 'do I have root access?' as a conditional in bash?

The suggestion to \'try to do something and de

Answer 1

unless the script you are calling has an exit condition, there isn't much you can do. However look up "set" in the bash man page.

set -e

will cause a script to exit if a simple command in it fails. You can add it to the top of script.sh in your example to cause it to exit if it fails.

also look at trap. I believe

trap 'exit 2' ERR

is similar