Sed additional commands

Append command (Command a)

Sed ' [address] a the-line-to-append ' input-file

Append a row after the second line (there may be a problem with the original, there is no line number to write the name)

[[Email protected] ~]# sed ' 2 a 203,jack johnson,engineer ' Employee.txt

101,johnnynynyny Doe,ceo

102,jason Smith,it Manager

203,jack Johnson,engineer

103,raj Reddy,sysadmin

104,anand Ram,developer

105,jane Miller,sales Manager

#106, Jane miller,sales Manager

#107, Jane miller,sales Manager

Append a line to the end of the Employee.txt file:

[[Email protected] ~]# sed ' $ A 106,jack johnny,engineer ' Employee.txt

101,johnnynynyny Doe,ceo

102,jason Smith,it Manager

103,raj Reddy,sysadmin

104,anand Ram,developer

105,jane Miller,sales Manager

#106, Jane miller,sales Manager

#107, Jane miller,sales Manager

106,jack Johnny,engineer

Append two lines after the line that matches Jason

[[Email protected] ~]# sed '/jason/a\

> 203,jack johnson,engineer\

> 204,mark smith,slaes Engineer ' Employee.txt

101,johnnynynyny Doe,ceo

102,jason Smith,it Manager

203,jack Johnson,engineer

204,mark Smith,slaes Engineer

103,raj Reddy,sysadmin

104,anand Ram,developer

105,jane Miller,sales Manager

#106, Jane miller,sales Manager

#107, Jane miller,sales Manager

You can use \ n to wrap between multiple rows, so that you do not have to break the line, the above command is equivalent to:

[[Email protected] ~]# sed '/jason/a 203,jack johnson,engineer\n204,mark smith,slaes Engineer ' Employee.txt

101,johnnynynyny Doe,ceo

102,jason Smith,it Manager

203,jack Johnson,engineer

204,mark Smith,slaes Engineer

103,raj Reddy,sysadmin

104,anand Ram,developer

105,jane Miller,sales Manager

#106, Jane miller,sales Manager

#107, Jane miller,sales Manager

Modify command (Command C)

Sed ' [address] c The-line-to-insert ' Input-file

Replace line 2nd with new data

[[Email protected] ~]# sed ' 2 c 202,jack,johnson,engineer ' Employee1.txt

101,john Doe,ceo

202,jack,johnson,engineer

103,raj Reddy,sysadmin

104,anand Ram,developer

105,jane Miller,sales Manager

#106, Jane miller,sales Manager

#107, Jane miller,sales Manager

Here the command C is equivalent to the replacement: sed ' 2s/.*/202,,jack,johnson,engineer/' employee.txt

SED can also use multiple lines to replace a row

Replace rows that match Raj with two rows of data

[[Email protected] ~]# sed '/raj/c \

> 203,jack,johnson,engineer \

> 204,mark smith,slaes Engineer ' Employee.txt

101,johnnynynyny Doe,ceo

102,jason Smith,it Manager

203,jack,johnson,engineer

204,mark Smith,slaes Engineer

104,anand Ram,developer

105,jane Miller,sales Manager

#106, Jane miller,sales Manager

#107, Jane miller,sales Manager

Commands A, I, and C are used together

L a add "Jack Johnson" behind "Jason "

L I insert "Mark Smith" in front of "Jason"

L C Replace "Jason" with "Joe Mason "

[[Email protected] ~]# sed '/jason/{

A\

204,jack Johnson,engineer

I\

202,mark Smith,slaes Engineer

C\

203,joe Mason,sysadmin

} ' Employee.txt

101,johnnynynyny Doe,ceo

202,mark Smith,slaes Engineer

203,joe Mason,sysadmin

204,jack Johnson,engineer

103,raj Reddy,sysadmin

104,anand Ram,developer

105,jane Miller,sales Manager

#106, Jane miller,sales Manager

#107, Jane miller,sales Manager

Print invisible characters (command L)

First build the test file

[Email protected] ~]# vim Tab.txt

FName First Name

LName Last Name

Mname Middle Name

[Email protected] ~]# sed-n ' l ' tab.txt

FName First name$

LName Last name$

Mname Middle name$

$

If a number is specified after L, a non-visible auto-wrap is used at the nth character

[Email protected] ~]# sed-n ' l ' employee.txt

101,johnnynynyny do\

e,ceo$

102,jason smith,it \

manager$

103,raj reddy,sysad\

min$

104,anand ram,devel\

oper$

105,jane miller,sal\

Es manager$

#106, Jane miller,sa\.

Les manager$

#107, Jane miller,sa\.

Les manager$

This feature is only available for GNU SED

Print line number (Command =)

Print line numbers for all lines

[[Email protected] ~]# sed ' = ' employee.txt

1

101,johnnynynyny Doe,ceo

2

102,jason Smith,it Manager

3

103,raj Reddy,sysadmin

4

104,anand Ram,developer

5

105,jane Miller,sales Manager

6

#106, Jane miller,sales Manager

7

#107, Jane miller,sales Manager

Tip: Use command = and command n to display line numbers and content on the same line

Print line numbers for only one-line lines

[[Email protected] ~]# sed ' 1,3= ' employee.txt

1

101,johnnynynyny Doe,ceo

2

102,jason Smith,it Manager

3

103,raj Reddy,sysadmin

104,anand Ram,developer

105,jane Miller,sales Manager

#106, Jane miller,sales Manager

#107, Jane miller,sales Manager

Print the line that contains the keyword "Jane" while printing the contents of the input file:

[[Email protected] ~]# sed '/jane/= ' employee.txt

101,johnnynynyny Doe,ceo

102,jason Smith,it Manager

103,raj Reddy,sysadmin

104,anand Ram,developer

5

105,jane Miller,sales Manager

6

#106, Jane miller,sales Manager

7

#107, Jane miller,sales Manager

If you want to display only the line number but not the contents of the row, use the-N option to match the command =:

[Email protected] ~]# sed-n '/raj/= ' employee.txt

3

Total rows of printed files

[Email protected] ~]# sed-n ' $= ' employee.txt

7

Convert character (command y)

Command y converts characters based on their corresponding positions, one of the benefits of converting uppercase letters to lowercase and vice versa

The following example

[[Email protected] ~]# sed ' y/abcde/abcde/' employee.txt

101,johnnynynyny Doe,ceo

102,jason Smith,it MAnAgEr

103,raj Reddy,sysadmin

104,anand Ram,developer

105,jane Miller,sales MAnAgEr

#106, JAnE miller,sales MAnAgEr

#107, JAnE miller,sales ManAgEr

Convert all lowercase letters to uppercase

[[Email protected] ~]# sed ' y/abcdefghijklmnopqrstuvwxyz/abcdefghijklmnopqrstuvwxyz/' employee.txt

101,johnnynynyny Doe,ceo

102,jason Smith,it MANAGER

103,raj Reddy,sysadmin

104,anand Ram,developer

105,jane Miller,sales MANAGER

#106, JANE miller,sales MANAGER

#107, JANE miller,sales MANAGER

Manipulating Multiple Files

Search for root in/etc/passwd and print it out

[Email protected] ~]# sed-n '/root/p '/etc/passwd

Root:x:0:0:root:/root:/bin/bash

Operator:x:11:0:operator:/root:/sbin/nologin

Search for root in/etc/group and print it out

[Email protected] ~]# sed-n '/root/p '/etc/group

root:x:0:

Search for root in both/etc/passwd and/etc/group

[Email protected] ~]# sed-n '/root/p '/etc/passwd/etc/group

Root:x:0:0:root:/root:/bin/bash

Operator:x:11:0:operator:/root:/sbin/nologin

root:x:0:

Exit sed (Command q)

When SED encounters the command q, it exits immediately, and subsequent commands in the current loop are not executed and will not continue to loop

Exit after printing the first line

[[Email protected] ~]# sed ' 1 q ' employee.txt

101,johnnynynyny Doe,ceo

Exit after printing 5 lines

[[Email protected] ~]# sed ' 5 q ' employee.txt

101,johnnynynyny Doe,ceo

102,jason Smith,it Manager

103,raj Reddy,sysadmin

104,anand Ram,developer

105,jane Miller,sales Manager

Print all lines until you encounter the line that contains the keyword manager

[[Email protected] ~]# sed '/manager/q ' employee.txt

101,johnnynynyny Doe,ceo

102,jason Smith,it Manager

Note: The Q command cannot specify an address range (or pattern range) and can only be used with a single file (or a single mode)

Reading data from a file (command R)

[[Email protected] ~]# sed ' $ r log.txt ' Employee.txt

101,johnnynynyny Doe,ceo

102,jason Smith,it Manager

103,raj Reddy,sysadmin

104,anand Ram,developer

105,jane Miller,sales Manager

#106, Jane miller,sales Manager

#107, Jane miller,sales Manager

Log:input.txt

Log

Log:testing resumed

Log

Log:output created

[Email protected] ~]# sed '/raj/r. /sed8awk/log.txt ' Employee.txt

101,johnnynynyny Doe,ceo

102,jason Smith,it Manager

103,raj Reddy,sysadmin

104,anand Ram,developer

105,jane Miller,sales Manager

#106, Jane miller,sales Manager

#107, Jane miller,sales Manager

Sed additional commands