What's the best way to check that environment variables are set in Unix shellscript
- by AndrewR
I've got a few Unix shell scripts where I need to check that certain environment variables are set before I start doing stuff, so I do this sort of thing:
if [ -z "$STATE" ]; then
echo "Need to set STATE"
exit 1
fi
if [ -z "$DEST" ]; then
echo "Need to set DEST"
exit 1
fi
which is a lot of typing. Is there a more elegant idiom for checking that a set of environment variables is set?
EDIT: I should mention that these variables have no meaningful default value - the script should error out if any are unset.
