I'm positive. In the NonStop Knowledge Base, there's even a case in there for it. It's been in a state of "Under Development Review" for some time, and I think they just don't want another wacky Unix tool to support
Seriously though, this isn't even "truly" Unix, if there was such a thing in the first place. It's a semi-POSIX-compatible environment. There's no Unix kernel, only /dev/tty and /dev/null as devices, and no freakin dd! (Although we have tr on the system, I wonder how long that would take to translate a huge datafile...)
For more information on the NonStop, see here:
http://h71033.www7.hp.com
(Note: NonStop used to be Compaq Himalaya, and before that was known as Tandem Computers)