Overall, after the sale to Vita Nuova, one could assert Inferno has had much more real commercial use than Plan 9 has ever had outside Bell Labs.
Yet Plan 9 fans seldom acknowledge it was a transition between UNIX and Inferno.
The “joke” is not part of the FAQ. So, what actually is the joke? Has the joke been made in public forums before today? We're unable to find prior art concerning this joke or meme. Does "plan9 humor" consist mostly of making shit up?
Still, Doom was released after the movie, so unlikely it would be in Jurassic Park.
Yes. It says so in the AT&T SysV R4 User's Manual.