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Most people know only the bare minimum to move files around. Not everyone has spent their life on a nix command line.

And I don't even know why you'd think iostat, watch, htop, or tmux would be well-known amongst anyone other than sysadmins and long-time nix power users. And tmux didn't even exist five years ago.

Fair enough. 5 years is a long time in the tech world to me. Tons of things change in that time. I'm not a sysadmin, and I'm not against educating people about these tools. I'm also not saying the exact inverse of the original statement (that everybody knows these). What I am saying is that it's a stretch to say they aren't well known. Call it "intermediate linux usage" or something.

'watch' is so awesomely useful. Everyone should know it.

I only recently learned about ioping, which I think would fit into that list well.

fc, tac, sudo !!, vim, ...