Bash Shell脚本 – 返回键/ Enter键

我需要将输入与输入/返回键进行比较

read -n1 key
if [ $key == "\n" ]
   echo "@@@"
fi

但这不工作..这个代码有什么问题

发布代码的几个问题.内联评论详细说明要修复的内容：

#!/bin/bash 
# ^^ Bash,not sh,must be used for read options

read -s -n 1 key  # -s: do not echo input character. -n 1: read only 1 character (separate with space)

# double brackets to test,single equals sign,empty string for just 'enter' in this case...
# if [[ ... ]] is followed by semicolon and 'then' keyword
if [[ $key = "" ]]; then 
    echo 'You pressed enter!'
else
    echo "You pressed '$key'"
fi