You are probably right. The one in FreeBSD is from NetBSD: https://svnweb.freebsd.org/base/head/usr.bin/units/units.c?view=log https://svnweb.freebsd.org/base/

You are probably right. The one in FreeBSD is from NetBSD: https://svnweb.freebsd.org/base/head/usr.bin/units/units.c?view=log https://svnweb.freebsd.org/base/head/usr.bin/units/units.c?v... The NetBSD version is from Adrian Mariano: http://cvsweb.netbsd.org/bsdweb.cgi/src/usr.bin/units/units.c?only_with_tag=MAIN http://cvsweb.netbsd.org/bsdweb.cgi/src/usr.bin/units/units.... The one in Plan9 is in yacc: http://9p.io/sources/plan9/sys/src/cmd/units.y http://9p.io/sources/plan9/sys/src/cmd/units.y This GitHub repo claims to be V6: https://github.com/memnoth/unix-v6/blob/master/source/s2/units.c https://github.com/memnoth/unix-v6/blob/master/source/s2/uni...