cat(1) - concatenate files and print on the standard output
Concatenate FILE(s), or standard input, to standard output.
-A, --show-all
       equivalent to -vET
-b, --number-nonblank
       number nonempty output lines, overrides -n
-e     equivalent to -vE
-E, --show-ends
       display $ at end of each line
-n, --number
       number all output lines
-s, --squeeze-blank
       suppress repeated empty output lines
-t     equivalent to -vT
-T, --show-tabs
       display TAB characters as ^I
-u     (ignored)
-v, --show-nonprinting
       use ^ and M- notation, except for LFD and TAB
--help display this help and exit
       output version information and exit
With no FILE, or when FILE is -, read standard input.