There is a difference between Mac and CentOS above cat

There is a difference between Mac and CentOS above cat

Usage on Mac:

yuanlongair:~ ylchou$ cat--helpcat:illegal option---usage:cat [-BENSTUV] [File ...]

How to use Cat on centos6.5:

[email protected] ~]# cat--version

Cat (GNU coreutils) 8.4Copyright (C) Free Software Foundation, Inc. License: GPLV3+:GNU general Public License version 3rd or later 

There are more on CentOS than on Mac-A, E,-T, as follows:
[Root@zyl ~]# Cat--help
Usage: cat [options]... [file] ... Output the [file] or standard input combination to the standard output.   -A, --show-all            equals-vet   -b, --number-nonblank     number of non-null output lines   -e                         equals-ve  -e, --show-ends           displays "$" at the end of each line   -n, --number              Numbering all lines of output   -s, --squeeze-blank       not outputting multiple lines of blank lines   -t                          and-vt  equivalent   -T, --show-tabs            Display the ^i  -u      &nbs character as ap;                 (ignored)    -v, --show-nonprinting    use ^  and m-  references, except LFD and  TAB         --HELP displays this help information and exits       --version displays the version information and exits if no file is specified, or the file is "- ", then read from the standard input. Example:  cat f - g   outputs the contents of the f , then outputs the contents of the standard input, and finally outputs the contents of the g .   cat         Copy the contents of the standard input to the standard output. Please report cat  error to [email protected]  gnu coreutils  Project home: 

There is a difference between Mac and CentOS above cat