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sed is a nifty utility that allows you to search and replace text in a file using a short 1-liner.

The following command does the following:
1. Searches for the keyword in every line of the input_file
2. In every matching line it looks for search_string
3. It replaces every instance of search_string with replace_string



How to search and replace with nano text editor

Nano is a very compact and feature packed text editor commonly found on Linux and Unix based OS. One of the lesser used feature that is very useful is search & replace.

To Search and Replace text in the currently open file:

The search string can also be a regular expression.