" underline " " $Id: underline,v 1.1 1997/05/29 20:51:59 cdua Exp cdua $ " Carlos Duarte, 970221 " " " _u single underline current line " _U double underline (under and above) " " map! _U yyp:s/./-/g yykPjjo map! _u yyp:s/./-/g o