Lot of folks who have only used Linux would be stumped if they see "cd: not found"

I am confused, where did "cd" come from and why did it replace "chdir"?

cd arrived in the v7 Bourne shell, v6's shell was by Ken Thompson (it's just the name of the system call that cd calls)

heh - always sync twice - almost 40 years later my fingers still do that sometimes when I'm thinking .... (I used to port Unix for a living, early ports were always a tad unstable after that first prompt)

My eyesight is getting worse but is that person typing nude?

Certainly not!

He's wearing a watch.

I can see trouser pockets! either that or they're wearing a holster in the nude - which is a whole other ballgame entirely.

Did you really have to use "ballgame"?

That thing needs some serious retrobrighting.

IIRC the VT-100 was naturally more yellow-brown than beige.

Brand-new they were pretty white (and gray)

Wow, why is this video unlisted?