My plan
=======

First of all, I should read `man wc`.

Description:
     The wc utility  reads  one  or  more  input  files  and,  by
     default,  writes the number of newline characters, words and
     bytes contained in each input file to the standard output.

     The utility also writes a total count for all  named  files,
     if more than one input file is specified.

     wc considers a word to be a non-zero-length string of  char-
     acters  delimited  by white space (for example, SPACE, TAB).
     See iswspace(3C) or isspace(3C).

 The following options are supported:

     -c       Counts bytes.

     -C       Same as -m.

     -l       Counts lines.

     -m       Counts characters.

     -w       Counts words delimited by white space characters or
              new  line  characters.  Delimiting  characters  are
              Extended Unix Code (EUC) characters from  any  code
              set defined by iswspace().

     If no option is  specified,  the  default  is  -lwc  (counts
     lines, words, and bytes.)

    See largefile(5) for the description of the behavior  of  wc
     when encountering files greater than or equal to 2 Gbyte ( 2
    **31 bytes).

    See environ(5) for descriptions of the following environment
     variables  that  affect  the  execution of wc: LANG, LC_ALL,
     LC_CTYPE, LC_MESSAGES, and NLSPATH.

SEE ALSO
     cksum(1),    isspace(3C),    iswalpha(3C),     iswspace(3C),
     setlocale(3C),   attributes(5),   environ(5),  largefile(5),
     standards(5)