cat [ -b | -E | -n | -s ] [FILE]
CAT
Usage: cat [OPTION] [FILE]
Concatenate FILE(s), or standard input, to standard output.
 
	-b			number nonempty output lines, overrides -n
	-E			display $ at end of each line
	-n			number all output lines
	-s			supress repeated emty output lines

With no FILE, read standard input.

Examples:
	cat			Copy standard input to standard output.
	cat FILE		Print content of FILE to standard output.
	cat -n FILE		Print content of FILE to standard output and add number to each line.