The vi utility shall conform to the Base Definitions volume of
POSIX.1‐2017, Section 12.2, Utility Syntax Guidelines, except
that '+' may be recognized as an option delimiter as well as '-'.
The following options shall be supported:
-c command
See the ex command description of the -c option.
-r See the ex command description of the -r option.
-R See the ex command description of the -R option.
-t tagstring
See the ex command description of the -t option.
-w size See the ex command description of the -w option.