Some uses of shell SED

#1, replace

Replace 2017 in #将1. txt file with 2016 display on screen

Sed "s/2017/2016/g" 1.txt

Replace 2017 in #将1. txt file with 2016 display to completely modify the file on the screen, plus I modify the file

Sed-i "S/2017/2016/g" 1.txt

#Sed读取系统变量, variable substitution

date= "sed" s/2017/$DATE/g "1.txt

#关闭SELinux, modify the SELinux policy enforcing to Disabled, find the SELinux row, and then change its row enforcing value to disabled,!s to not include SELinux rows:

Sed-i "/selinux/s/enforcing/disabled/g"/etc/selinux/configsed-i "/selinux/!s/enforcing/disabled/g"/etc/selinux/ Config

#2, printing

#打印1 the first line of the. txt text to the third line

Sed-n "1,3p" 1.txt

#3打印1 the first and last line of the. txt text

Sed-n "1p, $p" 1.txt

#3, delete

#删除第一行至第三行

Sed ' 1,3d ' 1.txt

#删除匹配行至最后一行

Sed '/2017/, $d ' 1.txt

#删除最后一行

Sed ' $d ' 1.txt

#删除最后6行 (do 6 delete last line)

For i in {1..6};d o sed-i ' $d ' 1.txt;d One

#删除1. txt any space before and at the end of a line:

Sed ' s/^[\t]*//;s/[\t]*$//' 1.txt

#删除所有空格

Sed ' s/[\t]//g ' 1.txt

#4, adding characters

#在1. txt to find the row for you and add the me character to the next line, a means to add a string on its next line:

Sed '/you/ame ' 1.txt

#在1. txt to find the row where you are, and add the me character on the line above it, I means to add a string on its previous line:

Sed '/you/ime ' 1.txt

#在1. txt to find the end of the line ending with a string me,$ to indicate the end of the identification,& in sed to add:

Sed ' s/you$/&me/g ' 1.txt

#在1. txt to find a line for you, add a string at the beginning of the me,^ to represent the starting identity,& in sed to add:

Sed '/you/s/^/&me/' 1.txt

#5, multiple sed command combinations

#使用-e parameter

Sed-e '/www.jd.com/s/^/&1./'-e ' s/www.jd.com$/&./g ' 1.txt

#使用分号 ";" Segmentation

Sed-e '/www.jd.com/s/^/&1./;s/www.jd.com$/&./g ' 1.txt

#6, inserting blank lines

#每一行后边插入一行空行

Sed '/^$/d; G ' 1.txtsed ' G ' 1.txt

#每一行后边插入两行空行

Sed '/^$/d; G G ' 1.txtsed ' G; G ' 1.txt

#前三行每行后插入空行

Sed '/^$/d;1,3g; ' 1.txt

#第三行后插入空行

Sed '/^$/d;3g; ' 1.txt

#第三行后插入3行空行

Sed '/^$/d;3{g; G G} ' 1.txt

#匹配行后插入空行

Sed '/2017/g ' 1.txt

#在匹配行前一行插入空行

Sed '/2017/{x;p;x;} ' 1.txt

#同时在匹配前后插入空行

Sed '/2017/{x;p;x; G;} ' 1.txt

#7, add sequential number, tab \ t, and. Symbol before 1.txt per line:

sed = 1.txt| Sed ' n;s/\n//' sed = 1.txt| Sed ' n;s/\n/\t/' sed = 1.txt| Sed ' n;s/\n/\./'

#8, print, and delete the last two lines of 1.txt:

Sed ' $! n;$! D ' 1.txtsed ' n;$! p;$! D; $d ' 1.txt

#9, merge the next two lines, that is, two lines of merging:

Sed ' $! n;s/\n//' 1.txtsed ' n;s/\n//' 1.txt

This article is from the "Mo Jing" blog, reproduced please contact the author!

Some uses of shell SED