SHELL 读取文件的每一行内容并输出-站长资讯网

假设读取的文件为当期目录下的 test.txt 文件，内容如下：

Google   Runoob  Taobao

实例 1

#!/bin/bash

while read line
do
echo $line
done < test.txt

执行输出结果为：

Google  Runoob  Taobao

#!/bin/bash

cat test.txt | while read line
do
echo $line
done

执行输出结果为：

Google  Runoob  Taobao

for line in `cat test.txt`
do
echo $line
done

执行输出结果为：

Google  Runoob  Taobao

for 逐行读和 while 逐行读是有区别的，如:

$ cat test.txt
Google
Runoob
Taobao

$ cat test.txt | while read line; do echo $line; done
Google
Runoob
Taobao

$ for line in $(<test.txt); do echo $line; done
Google
Runoob
Taobao