Linux sed command

Action:
P Print Output
D Delete operation
A adds a line following the specified line
I add a line before the specified line

1. View operation

123	sed-n ‘5p‘file//只查看文件的第5行sed-n ‘3,5p‘file//查看文件的第3到第5行sed-n ‘5,$ p‘file//打印第5到最后一行

　　

2. Delete operation

123	sed‘3 d‘1.txt                                //删除文件的第3行 ，然后将内容进行输出，不是直接操作的文件。sed ‘3,5 d‘1.txt                            //删除第三行到五行。sed‘3,$ d‘1.txt                           //删除第三行到最后一行。

　　

3. Add operation

123	sed‘2a word‘ file                          //在第二行后面添加一行，内容为word sed ‘3i word‘ file//在第三行前面添加一行，内容为word

　　

3, Find operations

123	sed  -n   '/root/p '  file                            //  sed   '/root/d '  < Code class= "Bash functions" >file                              // Delete the row containing the root, then output, plus-I can manipulate the original file

　　

4. Replace operation

123	sed‘s/root/new/‘file//将文件中的root替换成new，每行只替换一次sed‘s/root/new/g‘file//将每行的所有root全部替换成new        g替换多次sed‘3,4s/root/new/g‘1.txt                  //只替换第3到第4行的root为new

　　

Integrated use of SED

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The contents of the document are as follows:

19-Lo Jinhui: http://www.cnblogs.com/jw1519
20-Honeydew Autumn: Http://www.cnblogs.com/bazhahei
21-Zhang Jing: http://www.cnblogs.com/zj21
22-Huang Tinghui: http://www.cnblogs.com/1796440575hth
23-Liu Bo: http://www.cnblogs.com/oppppo
24-Jie: Http://www.cnblogs.com/duolaameng
25-Houbao:

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1、只输出学生姓名catjw |sed‘s/[0-9 a-Z ://.\-]/ /g‘2、只输出每个学生的urlcatjw |sed‘s/.*:\/.//g‘|sed‘/.*:/d‘ 3、只输出个人博客里的学号catjw |sed‘s/-.*/ /g‘4、只输出个人博客中，两个字姓名的学生名catjw |sed‘s/[0-9 a-Z ://.\-]//g‘|grep-v‘...‘ 5、只输出每个人博客地址的最后一段，即.com/后面的一段内容catjw |sed‘s/.*\// /g‘|sed‘s/.*://g‘6、只输出最后一段全部是字母的catjw |sed‘s/.*\// /g‘|sed ‘s/.*[0-9].*/ /‘|7、只输出最后一段含有大写字母的catjw |sed‘s/.*\// /g‘|sed-n ‘/[A-Z]/p‘

Change the last line of/etc/passwd to/bin/bash

1	cat/etc/passwd|sed ‘s/\(.*:\)\(.*\)/\1\/bin\/bash/‘                       //(.*:) 第一部分  (.*)第二部分        1表示第一部分

2. Add the user name in front of/etc/passwd per line to the last paragraph
such as: Root:x:0:0:root:/root:/bin/bash
Should be processed after the
Root:x:0:0:root:/root:/bin/bash:root

1	catpasswd |sed ‘s/\(^[a-Z]*\)\(.*\)/&:\1/‘                       //&表示全部

　

3. A text reads as follows:
192.168.100.2
172.16.5.4
10.101.2.5
133.37.25.21

It is processed by command to the following effect (converted to a line, separated by commas, each line of content enclosed in single quotation marks)
' 192.168.100.2 ', ' 172.16.5.4 ', ' 10.101.2.5 ', ' 133.37.25.21 '

1	cat  1.txt | sed     | tr   \ n ' |sed ' s/,$/\ n /g                        //

　

Linux sed command