sed命令是一个管道命令，具有替换，删除，新增， 选取特定行等功能。下面介绍一下其的简单用法：
源文件：
1 "Open Source" is a good mechanism to develop programs.$
2 apple is my favorite food.$
3 Football game is not use feet only.$
4 this dress doesn't fit me.$
5 However, this dress is about $ 3183 dollars.^M$
6 GNU is free air not free beer.^M$
7 Her hair is very beauty.^M$
8 I can't finish the test.^M$
9 Oh! The soup taste good.^M$
10 motorcycle is cheap than car.$
11 This window is clear.$
12 the symbol '*' is represented as start.$
13 Oh!^IMy god!$
14 The gd software is a library for drafting programs.^M$
15 You are the best is mean you are the no. 1.$
16 The world <Happy> is the same with "glad".$
17 I like dog.$
18 google is the best tools for search keyword.$
19 goooooogle yes!$
20 go! go! Let's go.$
21 # I am VBird$
22 $
- 删除2-5行：nl regular_express.txt | sed '2,5d'，这里2-5行都被删除。d代表删除 sed后面接的动作必须以两个单引号'括住
[root@192 Desktop]# nl regular_express.txt | sed '2,5d'
1 "Open Source" is a good mechanism to develop programs.
6 GNU is free air not free beer.
7 Her hair is very beauty.
8 I can't finish the test.
9 Oh! The soup taste good.
10 motorcycle is cheap than car.
11 This window is clear.
12 the symbol '*' is represented as start.
13 Oh! My god!
14 The gd software is a library for drafting programs.
15 You are the best is mean you are the no. 1.
16 The world <Happy> is the same with "glad".
17 I like dog.
18 google is the best tools for search keyword.
19 goooooogle yes!
20 go! go! Let's go.
21 # I am VBird
- 删除第3到最后一行：nl regular_express.txt | sed '3,$d'，其中$代表最后一行
[root@192 Desktop]# nl regular_express.txt | sed '3,$d'
1 "Open Source" is a good mechanism to develop programs.
2 apple is my favorite food.
- 在第二行后加上（即加在第三行）drink tea：nl regular_express.txt | sed '2a drink tea',如果在第二行前加上的话：nl regular_express.txt | sed '2i drink tea' 和删除类似，2是行数，a代表第二行后添加，i代表第二行前添加
[root@192 Desktop]# nl regular_express.txt | sed '2a drink tea'
1 "Open Source" is a good mechanism to develop programs.
2 apple is my favorite food.
drink tea
3 Football game is not use feet only.
4 this dress doesn't fit me.
[root@192 Desktop]# nl regular_express.txt | sed '2i drink tea'
1 "Open Source" is a good mechanism to develop programs.
drink tea
2 apple is my favorite food.
3 Football game is not use feet only.
4 this dress doesn't fit me.
- 添加多行 ，比如在第二行后面添加两行：nl regular_express.txt | sed '2a drink tea or ......\ drink beer ?' 注意其中有一个反斜杠\来进行换行。
[root@192 Desktop]# nl regular_express.txt | sed '2a drink tea or ...... \
> drink beer ?'
1 "Open Source" is a good mechanism to develop programs.
2 apple is my favorite food.
drink tea or ......
drink beer ?
3 Football game is not use feet only.
4 this dress doesn't fit me.
5 However, this dress is about $ 3183 dollars.
6 GNU is free air not free beer.
...
- 将第2-5行的内容替换为 NO 2-5 number:nl regular_express.txt | sed '2,5c No 2-5 number', 其中的c代表替换
[root@192 Desktop]# nl regular_express.txt | sed '2,5c No 2-5 number'
1 "Open Source" is a good mechanism to develop programs.
No 2-5 number
6 GNU is free air not free beer.
7 Her hair is very beauty.
8 I can't finish the test.
9 Oh! The soup taste good.
10 motorcycle is cheap than car.
...
- 仅列出 第5~7行:nl regular_express.txt | sed -n '3,7p' -n代表安静模式，在一般sed的用法中，所有来自STDIN的数据一般都会列出到屏幕上。但如果加上-n参数后，则只有经过sed特殊处理的那一行（或者操作）才会被列出来。
我们对比一下两个结果：
[root@192 Desktop]# nl regular_express.txt | sed '3,7p'
1 "Open Source" is a good mechanism to develop programs.
2 apple is my favorite food.
3 Football game is not use feet only.
3 Football game is not use feet only.
4 this dress doesn't fit me.
4 this dress doesn't fit me.
5 However, this dress is about $ 3183 dollars.
5 However, this dress is about $ 3183 dollars.
6 GNU is free air not free beer.
6 GNU is free air not free beer.
7 Her hair is very beauty.
7 Her hair is very beauty.
8 I can't finish the test.
9 Oh! The soup taste good.
10 motorcycle is cheap than car.
11 This window is clear.
12 the symbol '*' is represented as start.
13 Oh! My god!
14 The gd software is a library for drafting programs.
15 You are the best is mean you are the no. 1.
16 The world <Happy> is the same with "glad".
17 I like dog.
18 google is the best tools for search keyword.
19 goooooogle yes!
20 go! go! Let's go.
21 # I am VBird
加-n的时候，3-7行每一行都重复了一次。下面是不加-n的结果。只有被sed操作的行被显示出来。
[root@192 Desktop]# nl regular_express.txt | sed -n '3,7p'
3 Football game is not use feet only.
4 this dress doesn't fit me.
5 However, this dress is about $ 3183 dollars.
6 GNU is free air not free beer.
7 Her hair is very beauty.
- 将[.]替换为[*]：nl regular_express.txt | sed 's/.//g'* (sed 's/要被替换的字符串/新的字符串/g' g代表全局替换)
[root@192 Desktop]# nl regular_express.txt | sed 's/\./***/g'
1 "Open Source" is a good mechanism to develop programs***
2 apple is my favorite food***
3 Football game is not use feet only***
4 this dress doesn't fit me***
5 However, this dress is about $ 3183 dollars***
6 GNU is free air not free beer***
7 Her hair is very beauty***
8 I can't finish the test***
9 Oh! The soup taste good***
10 motorcycle is cheap than car***
11 This window is clear***
12 the symbol '*' is represented as start***
13 Oh! My god!
14 The gd software is a library for drafting programs***
15 You are the best is mean you are the no*** 1***
16 The world <Happy> is the same with "glad"***
17 I like dog***
18 google is the best tools for search keyword***
19 goooooogle yes!
20 go! go! Let's go***
21 # I am VBird
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