shell:读取文件的每一行内容并输出

写法一:

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#!/bin/bash
while read line
do
    echo $line
done < file(待读取的文件)
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写法二:
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#!/bin/bash
cat file(待读取的文件) | while read line
do
    echo $line
done
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写法三:
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for line in `cat file(待读取的文件)`
do
    echo $line
done
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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://www.moneyslow.com/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';

 
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