Sed is a non-interactive line-based text editor. It can perform an edition in either file or
STDIN and print it in
STDOUT, which can later be redirected to a file it needed.
-e Editing instructions follows -f File name of script follows -n Supress automatic output of lines -i Extension - Edit files in-place, saving backups with the specified extension. If a zero-length extension is given, no backup will be saved.