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#!/bin/bash
#这是shell脚本自动创建的文件
# 测试可读变量
echo '请输入可读变量的值:';
read var;
echo '可读变量var的值为----'$var;
# read命令作用:
# 从标准输入中读取一行,并把输入行的每个字段的值指定给shell变量
# 常用参数 功能
## -a 后跟一个变量,该变量会被认为是个数组,然后给其赋值,默认是以空格为分割符。
## -d 后面跟一个标志符,其实只有其后的第一个字符有用,作为结束的标志,会举例说明。
## -p 后面跟提示信息,即在输入前打印提示信息。
## -e 在输入的时候可以时候命令补全功能。
## -n 后跟一个数字,定义输入文本的长度,很实用。
## -r 屏蔽,如果没有该选项,则作为一个转义字符,有的话 就是个正常的字符了。
## -s 安静模式,在输入字符时不再屏幕上显示,例如login时输入密码。
## -t 后面跟秒数,定义输入字符的等待时间。
## -u 后面跟fd,从文件描述符中读入,该文件描述符可以是exec新开启的。
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