linux shell 之read命令

read可以从控制台或者文件读取输入内容

 

1、从控制台读取输入

 

#!/bin/bash
# -n 选项移除字符串末尾的换行符
echo -n "Enter your name:"
read name
echo "Hello $name,welcome to my program"

 

    

#!/bin/bash
# -p 允许直接在read命令行指定提示符
read -p "please enter your name:" name
echo "Hello $name,welcome to my program"

 

    

#!/bin/bash
# -p 允许直接在read命令行指定提示符
# -t 指定超时的时间
read -t 10 -p "please enter your name:" name
echo "Hello $name,welcome to my program"

 

   

#!/bin/bash
# -p 允许直接在read命令行指定提示符
# -s 隐藏方式读取，比如输入密码等，实际是将输入文本颜色变成和背景色一致
# -t 指定超时的时间
read -t 10 -s -p "please enter your name:" name
echo "Hello $name,welcome to my program"

 

2、从文件中读取

  

    

#!/bin/bash
count=1
cat testfile | while read line
do
 echo "line #$count: $line"
 count=$[ $count + 1 ]
done
echo "finished processing the file"