Possible Duplicate:
Automatic exit from bash shell script on error
How can I have bash stop on the first command failure, without putting stuff like this all through my code?
some_prog || exit 1
some_other_prog || exit 1
This question is related to
bash
Maybe you want set -e:
www.davidpashley.com/articles/writing-robust-shell-scripts.html#id2382181:
This tells bash that it should exit the script if any statement returns a non-true return value. The benefit of using -e is that it prevents errors snowballing into serious issues when they could have been caught earlier. Again, for readability you may want to use set -o errexit.
Source: Stackoverflow.com