hexadecimal representation of the non-printable byte
Write vis, which copies input to output. except that it displays nonprintable bytes like backspaces, control characters. and non-ASCII characters as \Xhh where hh is the hexadecimal representation of the non-printable byte. By contrast with strings, vi s is most useful for examining inputs that contain only a few nonprinting characters.
hexadecimal representation of the non-printable byte