shell读取文件的每一行内容并输出【转】

写法一：

#!/bin/bash

while read line
do
    echo $line
done < file(待读取的文件)

 

写法二：

#!/bin/bash

cat file(待读取的文件) | while read line
do
    echo $line
done

写法三：

for line in `cat file(待读取的文件)`
do
    echo $line
done

 

说明：
for逐行读和while逐行读是有区别的,如:

$ cat file
aaaa
bbbb
cccc dddd

$ cat file | while read line; do echo $line; done
aaaa
bbbb
cccc dddd

$ for line in $(<file); do echo $line; done
aaaa
bbbb
cccc
dddd

 

== 实践 === 

#! bin/sh
 
#$str='http://images.stylight.de/static/res200/s2870/2870657.1.jpg%0D'
#echo ${str##*fo}
#echo ${str#fo}
while read line
do
   wget -p ${line:0:59}
done < '/root/mysql/mysql.log';

转自

shell:读取文件的每一行内容并输出 - cbwcwy - 博客园
http://www.cnblogs.com/iloveyoucc/archive/2012/07/10/2585529.html