Ahhhh !!!! Just harken back to (glorious, IMHO) IRIX, & you should be off to the races. Many common Linux command line commands are named for their IRIX equivalents, so the familiarity should return quickly.
One might think so, but it was seven years ago since I was running SoftImage on Irix machines. Except for a brief experiment with running Linux about 6 years ago, I haven't touched a UNIX/IRIX/Linux machine since, and the commands are long since forgotten. I still remember basic concepts, like the differences between a super user and regular user, and file permissions and those kinds of general principles. But specific commands I can't remember at all.
I'm afraid my UNIX abilities have atrophied down to newbie level.
Dave