It almost works.

- unique is called uniq, but you can write an alias. I would not be surprised if it was called unique in this video for presentation purposes and uniq already worked at the time.

- sort will work as is

- lowercase is tr '[:upper:]' '[:lower:]' (you can write an alias).

- you need write programs makewords and mismatch and put them in $PATH (the current folder was probably in $PATH at the time but it's not anymore for security reason)

sort | uniq can be written sort -u.

But the gist of it is still accurate and still applies to today's unix-like systems, which is quite a thing for something that has more than 50 years.

`makewords` is `deroff -w`; `mismatch` is `comm -23`.

Thank you, I didn't know neither of them and they will probably save me some time in the future.

`makewords` is also `tr -cs "[:alpha:]" "\n"`

I strongly suspect that a lot of the commands he's using there are either shell functions or small scripts (or just aliases, actually) to make the example simple to follow. For instance, unique=uniq, lowercase='tr [AZ] [az]' (I think?), etc. You could trivially rewrite it today with a little effort to remake those.