循环

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';

解压多个tar.gz文件

for tar in *.tar.gz;do tar xvf $tar;done

解压多个gz文件

for gz in *.gz;do gunzip $gz; done