cat : concatenate files and print on the standard output
[SYNOPSIS] cat OPTION FILE
OPTION
-A equivalent to -vET
-b number nonempty output lines, overrides -n
-e equivalent to -vE
-E display $ at end of each line
-n number all output lines
-s suppress repeated empty output lines
-t equivalent to -vT
-T display TAB characters as ^I
-v use ^ and M- notation, except for LFD and TAB