shell讀取檔案

寫法一：
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#!/bin/bash
while read line
do
    echo $line
done < file(待讀取的檔案)
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寫法二：
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#!/bin/bash
cat file(待讀取的檔案) | while read line
do
    echo $line
done
----------------------------------------------------------------------------

寫法三：
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for line in `cat file(待讀取的檔案)`
do
    echo $line
done
----------------------------------------------------------------------------

說明：
for逐行讀和while逐行讀是有區別的,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

== 實踐 === 
#! bin/sh
while read line
do
   wget -p ${line:0:59}

done < '/root/mysql/mysql.log'

轉自：http://blog.sina.com.cn/s/blog_67b7d7e40101b723.html