Shell Script (v)

Shell Script (v)

4. Sed and awk

(1) SED

A, common parameters

#文件编辑工具, text files and standard input can be edited, the standard input is keyboard input,

#文件重定向, string, variable, and pipe text.

#-n: Do not print all rows to standard output;-e: Resolves the next string to the sed edit command

#-f: Calling sed script file

B. Positioning text

#x: Specify the line number; x, y: Specifies the range from X line to Y line;

#/pattern/: Query for rows that contain patterns;

#/pattern/pattern/: Query for rows containing two patterns;

#/pattern/,x: line from match pattern to row to X row

#x,/pattern/: Rows from x rows to matching rows with/pattern/

#x, y!: The query does not include rows with x and Y lines;

C, edit command

#p: print matching lines; =: Print the file line number; A\: Append text after locating the line;

#i \: Append text before locating the line;

#d: Delete the anchor row; C\: replace the positioned text with the new text; s: replace the pattern with the replacement mode

#r: Reads text from another file; W: Writes the file to a file; y: transforms the character;

#q: Exits after the first pattern is matched;

#1: Displays the equivalent control character of the octal ASCII code; {}: The command group executed on the anchor line;

#n: Reads the next input line and processes the new row with the next command

d. Examples

#打印第1行, and print/not print all lines of the file

Sed ' 1p ' a.txt

Sed-n ' 1p ' a.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6E/46/wKiom1V33VTRKyADAADqfpYLAag962.jpg "/>

#打印第2行到第4行

Sed-n ' 2,4p ' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6E/42/wKioL1V33vniNyHeAAEN19zWcN8690.jpg "/>

#打印不在第2到第4行的行

Sed-n ' 2,4!p ' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6E/46/wKiom1V33VTB7RgaAAEoB3ZE1q8215.jpg "/>

#定位行前1行追加文本

Sed '/name5/i\add_string ' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/6E/42/wKioL1V33vrSXR5oAADTsThS5Ms598.jpg "/>

#定位行后1行追加文本

Sed '/name5/a\add_string ' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/6E/46/wKiom1V33VXiPupYAACu9JMJjbY957.jpg "/>

#使用正则表达式需要使用s选项

#同1行定位字符串前面追加文本

Sed ' s/name5/addstring&/' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6E/42/wKioL1V33vvi_uWrAACkSx90f2Y614.jpg "/>

#同1行定位字符串后面追加文本

Sed ' s/name5/&addstring/' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6E/42/wKioL1V33vugZJrRAAChIsOeKVs817.jpg "/>

#修改定位文本

#将NAME5替换成rp_string

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6E/46/wKiom1V33VbyII_0AACDp3luL0I277.jpg "/>

#将NAME5定位行整行替换成rp_string

Sed '/name5/c\rp_string ' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/6E/42/wKioL1V33vzAe7iDAAB-yg0aoXE041.jpg "/>

#删除文本, delete line 6th, line 2nd to 5th, respectively

Sed ' 6d ' bkname.txt

Sed ' 2,5d ' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/6E/42/wKioL1V33vyhOuWbAADBCxhuWDs254.jpg "/>

#删除不在第2到第9行的行, it's actually showing lines 2nd through 9th.

Sed ' 2,9!d ' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/6E/46/wKiom1V33VfRepTmAACbVw4Mk0M151.jpg "/>

#参数p和g区别, P: The ball replaces only the 1th occurrence of matching text;

#g: Represents replacing all occurrences of the matched text

#sed是按行来处理的, so to delete the matching text in 1 rows more than once, you need to use G, notice the difference between the two

Sed-n ' s/name/*/p ' bkname.txt

Sed-n ' s/name/*/g ' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6E/42/wKioL1V33vygtmLtAADMp-Oz4S0032.jpg "/>

#字符变换, each of which corresponds to a replacement

#a替换成E, b Replace with f,c Replace with g,d Replace with H

Sed ' y/abcd/efgh/' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/6E/46/wKiom1V33VjD_l3ZAABdEXOG6_k671.jpg "/>

#元字符匹配, navigate to the last 1 rows

Sed-n ' $p ' bkname.txt

Sed-n ' $ ' p bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6E/46/wKiom1V33VjBspAtAABTHX0Fg8U363.jpg "/>

#定位以test结尾的行

Sed-n '/test$/p ' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6E/42/wKioL1V33v3zIQm2AABPHrKKYc4624.jpg "/>

#定位行到指定行, if you specify a row value > position row value, it will print

#指定行到最后1行, such as the specified row 8>4 (name4 row value)

Sed-n ' 3,/name4/p ' bkname.txt

Sed-n ' 8,/name4/p ' bkname.txt

#等价于

Sed-n ' 8, $p ' Bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6E/42/wKioL1V33v7AedRVAAEOf7h07YE981.jpg "/>

#定位行到指定行, if you specify a row value > anchor row value, only the anchor row is printed

Sed-n '/name4/,6p ' bkname.txt

Sed-n '/name4/,2p ' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6E/46/wKiom1V33VmDhZxQAACbUSf1xMs763.jpg "/>

#"!" Exclamation mark: Indicates non, shows rows not in line 2nd to 9th

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/6E/42/wKioL1V33v7y0sGoAABxxat2olg910.jpg "/>

#=: Print line numbers only

Sed-n '/name4/= ' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6E/46/wKiom1V33VnhKL3rAAB6XXXUQKc687.jpg "/>

#l (lowercase L): Display control

Sed-n ' 1, $l ' Bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/6E/46/wKiom1V33VnTMQ3FAADXy3UPRyE639.jpg "/>

#-e: Using multiple Edit commands

Sed-n '/name4/{p;=} ' bkname.txt

Sed-n-E '/name4/p '-e '/name4/= ' bkname.txt650) this.width=650; "Src=" http://s3.51cto.com/wyfs02/M02/6E/42/ Wkiol1v33v6jn9khaacrbx76xkc695.jpg "/>

#n: Handles the next row of the anchor row, replacing "00" with "*" for the next 1 rows of the anchor row

Sed '/name1/{n;s/00/*/g;} ' Bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6E/46/wKiom1V33VniibCXAADSHdr9f6M513.jpg "/>

#打印定位行的下一行

Sed-n '/name2/{n;p} ' bkname.txt

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6E/42/wKioL1V33v6TSAzJAABSoPwGKDE335.jpg "/>

# To execute a command group on the anchor row, note that the anchor row operation

Sed '/name1/{s/100/*/g;s/name/ttt/g;} ' Bkname.txt

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/6E/43/wKioL1V34cDBnX9SAAC39XNVfpE680.jpg "title=" Shell.png "alt=" Wkiol1v34cdbnx9saac39xnvfpe680.jpg "/>

This article is from the "Love On Action" blog, please be sure to keep this source http://1055745601.blog.51cto.com/5003160/1660411

Shell Script (v)