Bash Shell 脚本 - 检测 Enter 键

Question

我需要将我的输入与 Enter/Return 键进行比较...

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

但这行不通..这段代码有什么问题

Answer 1

发布的代码有几个问题。内联评论详细说明了要修复的内容:

#!/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