一:read倾听是一种美德
1.倾听键盘的输入并保存到变量中
例如:#! /bin/bash
echo "please input your name"
read name
echo "welcome $name !"
exit 0
或是read自带的显示提示语
例如:
#! /bin/bash
read -p "please input two args" name place
echo "welcome $name to $place"
exit 0
2.如果不输入变量,其值保存在REPLY变量中
例如:
#! /bin/bash
read -p "please input two args"
echo "the content of you just input is $REPLY"
exit 0
3.read加时间限制
#! /bin/bash
# 5秒内不输入则
if read -t 5 -p "please input two args"
then
echo "the content of you just input is $REPLY"
else
echo "sorry you are too late"
exit 0
4.隐蔽输入内容
#! /bin/bash
read -s -p "please input your password" password
echo "here,your password is $password"
5.使用 -u选项读取文件
#! /bin/bash
exec 3<~/文档/test.txt # ~/文档/test.txt代表的是读取的文件目录
count=0
while read -u 3 -r var #这里使用-r预防读入每行时未正常换行
do
let count=$count+1 #let是执行计算的命令
echo "LIne $count:$var"
done
echo "finished!"
echo "Line num is $count"
exec 3<&- #关闭文件描述符