Opens a file for reading, writing, or editing. It positions the
    file at its beginning (byte 0).

    Format

      #include  <fcntl.h>

      int open  (const char *file_spec, int flags, mode_t mode);
                (ANSI C)

      int open  (const char *file_spec, int flags, . . . );
                (DEC C Extension)

  Additional Information (explode) :

• Arguments
• Description
• Return Values
• Example