一、前言
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
二、实现
实例(1)
#!/bin/bash
while read line
do
echo $line
done < test.txt
- 执行输出结果为:
Google
Runoob
Taobao
实例(2)- 推荐(原因:易读)
#!/bin/bash
cat test.txt | while read line
do
echo $line
done
- 执行输出结果为:
Google
Runoob
Taobao
实例(3)
for line in `cat test.txt`
do
echo $line
done
- 执行输出结果为:
Google
Runoob
Taobao
三、for 逐行读和 while 逐行读是有区别的
- 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