#!/bin/bash

# -r 防止特殊字符被转义，例如 \n
read -r pwd1
read -r pwd2

echo "$pwd1 is zero string?"
[ -z "$pwd1" ]
echo $?

[ "$pwd1" = "$pwd2" ]
if [ $? -eq 0 ]
then
    echo "pwd1 is equal to pwd2"
else
    echo "pwd1 is not equal to pwd2"
fi