shell:讀取檔案的每一行內容並輸出

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
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寫法三：
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for line in `cat file(待讀取的檔案)`
do
    echo $line
done
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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 #$str='http://images.stylight.de/static/res200/s2870/2870657.1.jpg%0D'#echo ${str##*fo}#echo ${str#fo}while read linedo   wget -p ${line:0:59}done < '/root/mysql/mysql.log';