shell读取文件的每一行
shell读取文件的每一行写法一：
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#!/bin/bash
while read line
do
echo $line
done < filename(待读取的文件)
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写法二：
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#!/bin/bash
cat filename(待读取的文件)|while read line
do
echo $line
done
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如果有需要输出含指定字符的行，可以写成
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#!/bin/bash
cat filename(待读取的文件) | grep word(指定字符)|while read line
do
echo $line
done
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写法三：
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for line in `cat filename(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:
file文件内容如下：
$ cat file
1111
2222
3333 4444 555
$ cat file | while read line; do echo $line; done
1111
2222
3333 4444 555
$ for line in $(
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