You can search and replace text inside multiple files using Perl. This is how you do it:
$ perl -i -pe 's/Windows/Linux/;' test*
This command will search for the word ‘Windows’ inside all files that begin with ‘test’. When it finds one, it will substitute it with the word ‘Linux’. This is useful if you have multiple files that contain the same text. Remember that you can use regular expressions to make searching flexible.