If the file is a character special or block special file, the size of the file shall be replaced with two unsigned numbers in the format "%u, %u", representing the major and minor device numbers associated with the special file.
The LSB does not specify the meaning of the major and minor devices numbers. |
in addition to ISO POSIX (2003) behavior of printing a slash for a directory, ls -p may display other characters for other file types.
Certain aspects of the pattern matching notation are optional; see Internationalization and Pattern Matching Notation.