在bash中使用getopts覆盖无效的选项消息

Question

I am using getopts to track options that are given to my script. However, I want to able to detect whether an option that was specified is invalid. I can do this, but it will always echo a message that I haven't written.

The result

my.sh: illegal option -- x
Error: Invalid option was specified --

What I want to achieve

Error: Invalid option was specified --

A snippet of my code

while getopts g:r: option; do
        case $option in
                g) guesses=$OPTARG;;
                r) range=$OPTARG;;
                ?) echo "Error: Invalid option was specified -- $OPTARG";;
        esac
done

How can I achieve the desired result?

Answer 1

Assuming you want two short options -g and -r , the following example will not trigger the illegal option message on passing -x :

while getopts ":g :r" option; do
    case $option in
        g) guesses=$OPTARG;;
        r) range=$OPTARG;;
        ?) echo "Error: Invalid option was specified -$OPTARG";;
    esac
done

Answer 2

通过在标志之前添加: ，我告诉getopts我想控制不在我设置的列表中的标志。

Answer 3

In bash you can set OPTERR to 0 before commencing parsing:

OPTERR=0
while getopts 'option string' opt; do
    echo    "opt    = $opt"
    echo    "OPTIND = $OPTIND"
    echo    "OPTARG = $OPTARG"
    echo    "OPTERR = $OPTERR"
done