How do use cmp command to compare byte by byte on linux?

[pangolinsos]

Man page for cmp.

Also see: How do i use comm to compare two sorted files in linux?

Sample files are:

$ cat fileA
Flying by the seat of my pants.
Surfing by the seat of my pants.
Rowing by the seat of my pants.

$ cat fileB
Flying by the seat of my pants.
Surfing by the seat of my pants.
Swimming by the seat of my pants.

Shows the first byte difference.

$ cmp fileA fileB
fileA fileB differ: byte 66, line 3

There's no output if all the bytes are the same.