Linux sed command (daily one learns)

1th SED Foundation 1.1 sed options

-R supports extended regular

-N cancels the default output

-I direct modification does not output to the desktop

-i.bak Backup

The writing format of 1.2 sed

Sed ' conditional command '

Sed ' pattern command '

Sed ' mode command '

1.3 sed command execution process

1. Read the contents of the file 1th line

2. Whether the conditions are met

1). The command that satisfies the condition executes the corresponding P s D

2). Not satisfied continue to 1th step

3. To the last line of the file

Chapter 2nd use of the SED command

Sed add and delete to change the no I option will only change the contents of the output to not really modify, plus I option will directly modify the file content

2.1 Sed increased CAI

C Replace replacement

A append Append

I insert Inserts

2.1.1 Append 12306,xiao,ufo to the third line of the Person.txt file

View Person.txt File

[email protected] lx]# cat Person.txt101,zeq,ceo102,zhang,cto103,love,coo104,yy,cfo105,faker,cio110,ahao,coco

Append 12306,xiao,ufo to the third line

[[Email protected] lx]# sed ' 3a12306,xiao,ufo ' person.txt      a append, 3a added 101,zeq,ceo102,zhang,cto103,love under the third line, Coo12306,xiao,ufo104,yy,cfo105,faker,cio110,ahao,coco

2.1.2 inserting 12306,xiao,ufo on the third line of the Person.txt file

[Email protected] lx]# sed ' 3i12306,xiao,ufo ' person.txt101,zeq,ceo102,zhang,cto12306,xiao,ufo103,love,coo104,yy, Cfo105,faker,cio110,ahao,coco

2.1.3 Replace the third line of the Person.txt file with 12306,xiao,ufo

[roo[email protected] lx]# sed ' 3c12306,xiao,ufo ' person.txt101,zeq,ceo102,zhang,cto12306,xiao,ufo104,yy,cfo105, Faker,cio110,ahao,coco

2.1.4 added in last line of file

12306,xiao,ufo

12580,tao,xo

[[Email protected] lx]# sed  ' $a 12306,xiao,ufo\n12580,tao,xo ' person.txt    $ last line   \ n Enter 101,zeq,ceo102,zhang , Cto103,love,coo104,yy,cfo105,faker,cio110,ahao,coco12306,xiao,ufo12580,tao,xo

2.2 sed Delete d 2.2.1 Delete Row 2nd to line 5th

[[Email protected] lx]# sed ' 2,5d ' Person.txt101,zeq,ceo110,ahao,coco

2.2.2 Delete the line from YY to the end of the file

[[Email protected] lx]# sed   '/yy/, $d ' person.txt             $ file End 101,zeq,ceo102,zhang,cto103,love,coo

2.2.3 Delete rows that contain Ahao

[[Email protected] lx]# sed '/ahao/d ' Person.txt101,zeq,ceo102,zhang,cto103,love,coo104,yy,cfo105,faker,cio

2.2.4 Delete rows that do not contain Ahao

[[Email protected] lx]# sed '/ahao/!d ' person.txt             ! Take the reverse, exclude 110,ahao,coco

2.3 sed replaces ' s## #g ' 2.3.1 Replace all numbers

[[Email protected] lx]# sed ' s#[0-9]# #g '  Person.txt,zeq,ceo,zhang,cto,love,coo,yy,cfo,faker,cio,ahao,coco

2.3.2 Replace the first digit in each line

[[Email protected] lx]# sed ' s#[0-9]## '  person.txt       sed ' s#[0-9]## ' without G, default is match to the first number of each line       sed ' s#[0-9]## ' Match the second digit of each line 01,zeq,ceo02,zhang,cto03,love,coo04,yy,cfo05,faker,cio10,ahao,coco

2.3.3 The IP address after the reference is taken

[Email protected] ~]# ifconfig eth0 |sed-rn ' 2s#^.*r: (. *)  BC.*#\1#GP ' 10.0.0.200

[[email protected] ~]# ifconfig eth0 |awk-f ' [:]+ ' Nr==2{print $4   } ' 10.0.0.200

[[email protected] ~]# ifconfig eth0 |awk-f ' addr:|  Bc ' nr==2{print $   ' 10.0.0.200

[Email protected] ~]# ifconfig eth0 |awk-f ' [^0-9.] + '   nr==2{print $ ' 10.0.0.200

2.4 sed 2.4.1 Display the 5th line of the file

[Email protected] ~]# sed-n 5p Person.txt105,faker,cio

2.4.2 Show the file line 2nd to line 5th

[Email protected] ~]# sed-n ' 2,5p ' Person.txt102,zhang,cto103,love,coo104,yy,cfo105,faker,cio

2.4.3 display the last line of the file

[Email protected] ~]# sed-n ' $p ' Person.txt110,ahao,coco

2.4.4 displays the lines in the file that contain Zeq

[Email protected] ~]# sed-n '/zeq/p ' Person.txt101,zeq,ceo

2.4.5 display a line from a file that contains 101 lines to 105

[Email protected] ~]# sed-n '/101/,/105/p ' Person.txt101,zeq,ceo102,zhang,cto103,love,coo104,yy,cfo105,faker,cio

2.4.6 Special wording: Displays the 1th and 4 lines and 5 lines of the file

[Email protected] ~]# sed-n ' 1p; 4p; 5p ' Person.txt101,zeq,ceo104,yy,cfo105,faker,cio

2.4.7 Show a regular line

[[email protected] ~]# seq |sed-n ' 1~2p ' 13579

Using variables in 2.5 sed commands

[Email protected] ~]# X=zeq               set x variable to zeq[[email protected] ~]# y=zeq1             set y variable to zeq1[[email protected] ~]# sed ' s# $x # $y #g '  Person.txt101,zeq1,ceo102,zhang,cto103,love,coo104,yy,cfo105,faker,cio110,ahao,coco12306,xiao. Ufo

2.5.1 Replace the contents of each line in the file Person.txt file with the corresponding line number

The                     for loop in the shell script used here for n in {1..7} does     Sed-i.bak "${n}s#.*# $n #g" Person.txtdone

2.5.2 Batch rename: Delete html_ in file name

Touch zeq_html_{01..10}.jpg

Method 1  command-line format [[email protected] data]# ls *.jpg|sed-r "s# (. *) (_.*) #mv & Zeq\2#g" |bash

Method 2 for  loop for I on {01..10}domv zeq_${i}.jpg  zeq_html_${i}.jpg Done

Method 3  renamerename  html_  ""    *.jpg        rename   modify who    changed what    file

Linux sed command (daily one learns)