shell 脚本编程学习

case (in) / esac
        The case construct is the shell scripting analog to switch in C/C++. It permits branching to one of a
        number of code blocks, depending on condition tests. It serves as a kind of shorthand for multiple
        if/then/else statements and is an appropriate tool for creating menus.
        case "$variable" in
         "$condition1" )
         command...
         ;;
         "$condition2" )
         command...
         ;;
        esac

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