和有什么区别？和 * 在 Bash 中？

Question

所以你知道，你做你的标准 getopts 设置：

while getopts :a:bc option
do
    case "${option}"
    in
        a)
            # do a manditory thing!
        ;;
        b)
            # do a optional thing!
        ;;
        c)
            # for real, you usually would set variables using getopts
        ;;
        ?) # unexpected flag(?)
            echo "FATAL: Unexpected flag ${OPTARG}"
            exit 2
        ;;
        *) # litterally nothing entered(?)
            show_help
            exit 1
        ;;
    esac
done

据我所知，? 用于未定义的标志，* 用于未输入参数的情况。但是，我不确定....

Answer 1

Bash中问号和星号的区别：

?: matches any single character

*: matches any number of any characters including none

来源：https://en.wikipedia.org/wiki/Glob_(programming)

和有什么区别？和 * 在 Bash 中？

What is the difference between ? and * in Bash?

bash

glob

sh