They've been in dash for a pretty long time. NetBSD has lagged behind a bit. http://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=50958 http://gnats.netbsd

They've been in dash for a pretty long time. NetBSD has lagged behind a bit. http://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=50958 http://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=50... This just means that you're going to have to find a better way to describe the level of backwards compatibility you're going for other than "POSIX compliance", because these do seem to be required in the standards.