【shell】shell实现等待用户输入

序言

• 等待用户输入参数后再继续执行的shell脚本如何实现

使用-n参数

#! /bin/bash
echo -n "enter your name: "
read name
echo "your name is $name"

• -n 表示字符串输出尾端不换行

使用-p参数

#! /bin/bash
read -p "enter your name: " name
echo "your name is $name"

或者：

#! /bin/bash
read -p "Please enter your age: " age
days=$[ $age * 365 ]
echo "That makes you over $days days old"

• -p 用于给出提示符

要输入多个参数时

#! /bin/bash
read -p "enter your name: " name1 name2
echo "your name is $name1 $name2"

输入多个参数但不指定变量

• 把任何数据都放到特殊环境变量$REPLY中

#! /bin/bash
read -p "enter your name: "
echo "your name is $REPLY"

增加计时参数：超时后继续往下执行

• -t单位为s，等待超时后将执行后续命令

#! /bin/bash
if read -t 5 -p "enter your name: " name
then
	echo "your name is $name"
else
	echo "waiting timeout!"
fi

安装选项的实现：Y/N

#! /bin/bash
read -p "do you want to continue [Y/N]: " choice
case $choice in
	Y | y)
		echo "installing";;
	N | n)
		echo "bye";;
	*)
		echo "wrong input, bye";;
esac

隐藏输入参数的信息，比如密码

• -s参数避免输入数据显示在屏幕上，但变量仍可用

#! /bin/bash
read -s -p "enter your password: " pwd	# 屏幕上不会显示
echo "your password is $pwd"	# 变量仍可用

---

【参考文章】
[1]. shell等待用户输入
[2]. read的多个实例，推荐
[3]. read命令，-t和-s参数
[4]. read的参数选项

created by shuaixio, 2024.03.30