I am trying to play around with getopt options. I want both short options and long options.
For my following test script, it does not produce my required output.
#!/bin/bash
options=$(getopt -o d:f:t: -l domain -l from -l to -- "$@")
[ $? -eq 0 ] || {
echo "Incorrect options provided"
exit 1
}
eval set -- "$options"
while true; do
case "$1" in
-d | --domain)
DOMAIN=$2;
shift 2
;;
-f | --from)
FROM=$2;
shift 2
;;
-t | --to)
TO=$2;
shift 2
;;
--)
shift
break
;;
esac
shift
done
echo "Domain is $DOMAIN"
echo "From address is $FROM"
echo "To address is $TO"
exit 0;
When I try to run it, nothing happens, it just hangs:
# bash getopt_check.sh -d hello.com -f from@test.com -t to@test.com
Expecting output:
Domain is hello.com
From address is from@test.com
To address is to@test.com
You are shifting 3 values per option, -d hello.com are 2 positions, not three.
-d | --domain)
...
shift 2
...
-f | --from)
...
shift 2
...
-t | --to)
...
shift 2
...
shift # shift 2 + shift = shift 3!
change it to:
-d|--domain)
shift
...
-f|--from)
shift
...
-t|--to)
shift
...
shift
Prefer to use lower case variables in your script - use upper case for exported variables. Check your script with http://shellcheck.net . Prefer not to use $?, instead check the command in if like if ! options=$(getopt ...); then echo "Incorrect....
while true; do is unsafe, in case you do not handle some option it will endlessly loop. Do while (($#)); do and handle that *) echo "Internal error - I forgot to add case for my option" >&2; exit 1; ;; in the case statement.