Linux Three Musketeers--sed

1.1 sedIntroduction

1. Sed-stream editor

2. Sed features and versions:

Working with text files, logs, configuration files

Add, delete, modify, query

Sed--version

3. Syntax format:sed [ options ] [sed directive ] [ input file ]

Sed-i.bak ' S#boy#girl#g ' oldboy.txt

parameters of the- i sed command

s sed command

G Small tail / decoration

1.2 sedCommand Function Example

1. equals '=' Displays line numbers

# sed = person.txt

2. Single row-Enter line number

# sed-n ' 3p ' Person.txt

103,alex,coo

3. display multiple lines

# sed-n ' 3,6p ' person.txt

4. rows that contain Oldboy

# sed-n '/oldboy/p ' person.txt

101,oldboy,ceo

5. display lines containing Oldboy to display yy

# sed-n '/oldboy/,/yy/p ' person.txt

101,oldboy,ceo

102,zhangyao,cto

103,alex,coo

104,yy,cfo

6. display lines that contain Oldboy or yy

# sed-nr '/oldboy|yy/p ' person.txt

7. display discontinuous rows

# sed-nr ' 1p;3p;4p ' person.txt

8. Add two lines to the last line of the file

# sed ' $a 106,wuxingge,ufo\n107,lee,xo ' person.txt

#a ==append Append

#i ==insert Insertion

# echo-e ' 106,wuxingge,ufo\n107,lee,xo ' >>person.txt

# Cat >>person.txt <<eof

> 106,wuxingge,ufo

> 107,lee,xo

>eof

9. do not show blank line method ! represents an inverse

# sed '/^$/d ' person.txt

# sed-n '/^$/!p ' person.txt

# awk '!/^$/' person.txt

# grep-v ' ^$ ' person.txt

's###' means replacing the first object that meets the criteria by line

# sed ' s#1#dou# ' person.txt

Dou01,oldboy,ceo

-I means OK to modify

-i.bak means to back up and modify first

Double quotes inside the SED variable can be executed

A. sed command & symbol indicates what was previously matched to

# echo ' 123456 ' |sed ' s#.*#<&> #g '

<123456>

# echo ' 123456 ' |sed-r ' s# ([0-9]) #<\1> #g '

<1><2><3><4><5><6>

# echo ' 123456 ' |sed ' s#.#<&> #g '

<1><2><3><4><5><6>

1.3Batch Modify file name

1. Replace with sed

# ls *.jpg|sed-r ' s# (. *) JPG#MV & \1avi#g '

MV Oldboy01.jpg Oldboy01.avi

MV Oldboy02.jpg Oldboy02.avi

# ls *.jpg|sed-r ' s# (. *) JPG#MV & \1avi#g ' |bash

2. use The rename method to bulk modify file names

# rename jpg avi old*.jpg

Rename from to File

Replace what replaces the content with what files

1.4UseSedCommand Common pits

1. -R is used in conjunction with -I:

-r parameter in front:-ri Normal result

The-i parameter is in front:-ir indicates that the file is backed up XXR before replacing the contents of the file

2. - R and -N are used simultaneously: the contents of the source file will be emptied to show only eligible content

1.5 sedCommand Summary diagram

Linux Three Musketeers--sed