Linux Shell 输入内容进行格式化

#!/bin/bash
if [ $# -eq 1 ];then
        if [ $1 == "quit"  ];then
                echo "exit"
        elif [ $1 == "yes" ]; then
                echo "running."
        else
        echo "Use:yes|quit"
        exit 11
        fi
else 
        echo "Use:yes|quit"
        exit 11
fi