Explore the file system via chdir and ls (or ls -l), see what programs there are under /bin. Compile a C program (e.g. from ken's home directory) with cc and run it. Read the v6 man pages: https://man.cat-v.org/unix-6th/ Learn ed and write your own C program.

It even lacks man pages btw

I don't know why the man command is missing, because the pages themselves are there under /usr/man.

You can use roff to show the manpages.

e.g. roff -Tman who.1

Cool-- thanks :)

OK -- thanks:)