Options

E	(extended) Uses extended regular expressions (page 903) in place of basic ones.
f	program-file
	Causes sed to read its program from the file named program-file instead of from the command line. You can use this option more than once on the command line.
i	[suffix]
	Edits files in place. Without this option sed sends its output to standard output. With this option sed replaces the file it is processing with its output. When you specify a suffix, sed makes a backup of the original file. This backup has the original filename with suffix appended. You must include a period in suffix if you want a period to appear between the original filename and suffix.
n	Causes sed not to copy lines to standard output except as specified by the Print (p) instruction or flag.