Use of SED (1)-S parameter/replace

1. Sed syntax command

[Address] command or

Address {command

Command

Command

}

If no address is specified, use the command to match each line.

1 ABCD

TS 2 ABCD

3 ABCD

PS 10

Vs 12

Te 4 ABCD

 

6 ABCD

7 ABCD

CD --- AB

CD -- AB

See section 1.4

See section 12.44

Class: Group

Contrator: Employee

 

Example:

Sed-n'/^ TS/S/ABCD/efgh/P' Test

=> TS 2 efgh ABCD

 

Sed-n'/^ TS/S/ABCD/efgh/2P 'test # Add a number to specify the nth match of the row

=> TS 2 ABCD efgh

 

Sed-n'/^ TS/S/ABCD/efgh/PG 'test # full match of the row

=> TS 2 efgh

 

Sed-n'/^ TS /! S/ABCD/efgh/PG 'test # address added after! Apply to all rows that do not match the row

=>

1 efgh

3 efgh

Te 4 efgh

6 efgh

7 efgh

 

Sed-n'/^ TS/,/^ te/S/ABCD/efgh/PG 'test # match rows starting with TS to rows starting with Te

=>

TS 2 efgh

3 efgh

Te 4 efgh

 

Sed-n'/^ TS/,/^ te/S/ABCD/efgh/wha.txt 'test returns the result of sed to the file ha.txt

Cat ha.txt

=>

TS 2 efgh

3 efgh

Te 4 efgh

 

2. Sed grouping command

Sed '/^ TS/,/^ te/{S/ABCD/efgh/;/^ PS/d}' Test

 

3. & indicates the content of pattern in replacement

Sed's/See section [0-9] [1-9] */. [0-9] [1-9] */(&)/'test

=>

(See section 1.4)

(See section 12.44)

 

4. In SED, the escaped brackets enclose any part of the regular expression (pattern) and can be called back in the replacement part.

Sed's // (. */):/(. */) // 2:/1/'test

=>

GROUP: Class

Employee: contrator

 

5. If the replacement part contains special symbols, such as/, you can use another symbol to replace/In sed/

Sed should be included in ''When referencing external variables.

Item = Kernel

Value =/home/yazi/Default

 

Sed-n'/^ '$ item'/P' $ Profile
Kernel = <kernel path>

Now we need to replace the second half of = with the value of value.

 

Sed-n'/^ '$ item'/S &/(. */) =. * &/1 =' $ value' & P' $ Profile