庆典1.4.3无效选项

Question

说我有以下脚本来处理选项：[？]

while getopts dsf opts 2>/dev/null 
do 
    case $opts in 
    d) echo "d";; 
    s) echo "s";; 
    \?) echo "Error: An invalid option [?] was entered."; 
     exit 1;; 
    esac 
done 

我想更换与无效开关我进入。 所以，如果我进入

./myscript -z //output: Error: An invalid option [-z] was entered. 

我怎么会赶上无效开关？使用我的$ opts变量显示一个问号。

Answer 1

从help getopts：

getopts reports errors in one of two ways. If the first character 
of OPTSTRING is a colon, getopts uses silent error reporting. In 
this mode, no error messages are printed. If an invalid option is 
seen, getopts places the option character found into OPTARG.