给shell 脚本加一个启动密码

#!/bin/bash
clear && date
function pass(){
echo -e "请输入脚本启动密码: \c"

while : ;do
 char=`stty cbreak -echo
 dd if=/dev/tty bs=1 count=1 2>/dev/null
 stty -cbreak echo`
 if [ "$char" = "" ];then
     echo
     break
 fi
 PAS="$PAS$char"
 echo -n "*"
done

}

function pass_check(){
while : ;do
if [ `echo "$PAS"| md5sum |awk '{print $1}'` != "4d8702dc88b38fa64defa49bd22ef4e0" ];then
    clear && date
    echo -e "\033[31m 密码错误，请重新输入。\033[0m"
    PAS=''
    pass
else
    echo "密码正确，开始执行脚本....."
 break
fi
done

}

pass
pass_check
echo "asdf"

######### 脚步执行测试：