use getopt in shell script
 

Hi,
I want to use getopt(1) to check the shell script's option and its' option arguments!
e.g.
test.sh --version|-V
test.sh --update {a | b}
when i type:
test.sh --up
it should prompt that it can not recognize --up this option, other than lack of option arguments
test.sh --update
it should prompt that it lacks of option arguments
i wrote this shell script:

#!/bin/bash

ARGS=`getopt -o ab:c:: -l a-long,b-long:,c-long:: -- "$@"`


but, when i input:
./test.sh --b-lo
it prompts that the --b-lo lacks of arguments, other than it can not recognize it

The error message from ./test.sh --b-lo is correct. --b-lo is an "unambiguous abbreviation" of the --b-long defined in your getopt command as requiring an option argument which is not present in ./test.sh --b-lo