IRIX
It's a UNIX system... I know this...
— Lex Murphy, Jurassic Park, 1993
IRIX was a UNIX-based operating system by SGI, used on their workstations.
Its default desktop environment, the appropriately named IRIX Interactive Desktop, used the Motif widget toolkit, making its appearance familiar to those accustomed to CDE and vice versa.
Operating systems: DOS | IRIX | TOS
Unices: IRIX