sed - GoLinuxHub

sed: Replace string based on line number (certain line)

Here our requirement is that we have a file where we have to perform a string replacement but based on line number. Below is our sample data /tmp/file 1 This is line one 2 This

sed :Replace whole line when match found

Here our requirement is to replace a line with our content when a match is found with in the file Our sample file /tmp/file This is line one This is line two This is line

sed: match string and append new line (before or after)

Before is the requirement for this example. I have a sample file with below content at /tmp/file This is line one This is line two This is line three This is line four Here in

How to add line number at the beginning of each line

There are many ways to do this, I will try to show some Sample file '/tmp/file' Apple Apricot Avocado Banana Bilberry Blackberry Blackcurrant Method 1 Using 'nl' # nl /tmp/file 1 Apple

sed: Insert character in the beginning or end of line with matched pattern

In my last articles I had shared the arguments with sed which can be used to perform case insensitive actions (search, replace..) in a file and to delete all blank lines from the file. Before starting with some command

sed: insert word or text after match in middle of the line (search and append a string before or after match)

How to append a string after a match? For eg I have a text line "This is not test" where I would like to insert "really" after matching "is" Command: echo "This is not test"