shell:读取文件的每一行内容并输出

http://hi.baidu.com/buptwinnie/item/db82df3abbf79141023edcdb

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