sed -e "s/<html>/<\!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\">\n<html>\n<\!-- Parts of this page edited by Karl Goetz by hand using the VIM editor -->/g" testfile.htm

kgoetz@Evangelion:~/whtt$ sh sedscript.sh
sed: -e expression #1, char 36: unknown option to `s'