Returns a pointer to the file specification for the current
    working directory.

    Format

      #include  <unistd.h>

      char *getcwd  (char *buffer, size_t size); (ISO POSIX-1)

      char *getcwd  (char *buffer, unsigned int size, . . . );
                      (DEC C Extension)

  Additional Information (explode) :

• Function Variants
• Arguments
• Return Values