如何在shell脚本中使用if / else语句？

Question

我想知道如何使用if / else语句来检查我的unix shell中的密码是否正确。

Answer 1

以下是语法：

#!/bin/sh
# This is some secure program that uses security.

VALID_PASSWORD="secret" #this is our password.

echo "Please enter the password:"
read PASSWORD

if [ "$PASSWORD" == "$VALID_PASSWORD" ]; then
    echo "You have access!"
else
    echo "ACCESS DENIED!"
fi

bash-3.2$ Please enter the password:
secr
ACCESS DENIED!
bash-3.2$ 

bash-3.2$ Please enter the password:
secret
You have access!"
bash-3.2$ 

Click here for more on if/else syntax in scripts.

Answer 2

 read -s -e -p "Enter your password: " PASSWORD
 if [ "$PASSWORD" == "password"}; then
      echo "You have access!"
 fi