We will go through the examples of Sed substitution using regular expression as follows. Sed command in unix examples, we have given as follows. For all examples, we will consider one file as an input and get desired output from that file. i.e. employee.txt
root@rhel:~/test# cat employee.txt
1001,Ajay,Manager,25000
101,Satish,Founder,30000
302,Atul,CEO,26000
434,Raj,Senior Manager, 26000
1231,Kalyan,Human Resource,20000
root@rhel:~/test#
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Replace the last five characters in every line of file
In this example, we are replacing last five characters of each line by “Salary not decided” phrase.
root@rhel:~/test# cat employee.txt
1001,Ajay,Manager,25000
101,Satish,Founder,30000
302,Atul,CEO,26000
434,Raj,Senior Manager, 26000
1231,Kalyan,Human Resource,20000
root@rhel:~/test# sed 's/.....$/Salary not decided/g' employee.txt
1001,Ajay,Manager,Salary not decided
101,Satish,Founder,Salary not decided
302,Atul,CEO,Salary not decided
434,Raj,Senior Manager, Salary not decided
1231,Kalyan,Human Resource,Salary not decided
root@rhel:~/test#
|
Delete all commented lines in a file
In this example, we are deleting all commented lines of a file by sed command.
root@rhel:~/test# cat pattern.txt
1001,Ajay,Manager,Salary not decided
101,Satish,Founder,Salary not decided
302,Atul,CEO,Salary not decided
434,Raj,Senior Manager, Salary not decided
#1231,Kalyan,Human Resource,Salary not decided
#101,Satish,Founder,Salary not decided
434,Raj,Senior Manager, Salary not decided
1231,Kalyan,Human Resource,Salary not decided
root@rhel:~/test# sed 's/#.*//; /^$/d' pattern.txt
1001,Ajay,Manager,Salary not decided
101,Satish,Founder,Salary not decided
302,Atul,CEO,Salary not decided
434,Raj,Senior Manager, Salary not decided
434,Raj,Senior Manager, Salary not decided
1231,Kalyan,Human Resource,Salary not decided
root@rhel:~/test#
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Strip all HTML tags from html file or delete all html tags from html file
We can remove all html tags from html file using sed command.
root@rhel:~/test# cat emp.html
<html>
<body>
<h1>
Linux Concepts and Commands….roundoverlinux.blogspot.com
</h1>
</body></html>
root@rhel:~/test#
root@rhel:~/test#
root@rhel:~/test# sed 's/<[^>]*>//g' emp.html
Linux Concepts and Commands ..roundoverlinux.blogspot.com
root@rhel:~/test#
|
Insert Line after the matched pattern in file
Below is the syntax for inserting line after matched pattern line in a file.
sed '[address] a the-line-to-append' input-file
root@rhel:~/test# cat employee.txt
1001,Ajay,Manager,25000
101,Satish,Founder,30000
302,Atul,CEO,26000
434,Raj,Senior Manager, 26000
1231,Kalyan,Human Resource,20000
root@rhel:~/test# sed '2 i 1034,Sagar,CFO,34000' employee.txt
1001,Ajay,Manager,25000
1034,Sagar,CFO,34000
101,Satish,Founder,30000
302,Atul,CEO,26000
434,Raj,Senior Manager, 26000
1231,Kalyan,Human Resource,20000
root@rhel:~/test#
|
Append line after the matched pattern containing line:
Example shows the line appended after the second line. i.e. new line will be 3rd line in file.
root@rhel:~/test# cat employee.txt
1001,Ajay,Manager,25000
101,Satish,Founder,30000
302,Atul,CEO,26000
434,Raj,Senior Manager, 26000
1231,Kalyan,Human Resource,20000
root@rhel:~/test# sed '2 a 1034,Sagar,CFO,34000' employee.txt
1001,Ajay,Manager,25000
101,Satish,Founder,30000
1034,Sagar,CFO,34000
302,Atul,CEO,26000
434,Raj,Senior Manager, 26000
1231,Kalyan,Human Resource,20000
root@rhel:~/test#
|
Delete the line that matches pattern and replaces it with multiple new lines
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