How to exit if a command failed?

user_459246 0
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I am a noob in shell-scripting. I want to print a message and exit my script if a command fails. I've tried:

my_command && (echo 'my_command failed; exit)

but it does not work. It keeps executing the instructions following this line in the script. I'm using Ubuntu and bash.

exitstatus exit linux bash
9 Answers

Using exit directly may be tricky as the script may be sourced from other places (e.g. from terminal). I prefer instead using subshell with set -e (plus errors should go into cerr, not cout) :

set -e
ERRCODE=0
my_command || ERRCODE=$?
test $ERRCODE == 0 ||
    (>&2 echo "My command failed ($ERRCODE)"; exit $ERRCODE)
user_1024840
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