1. Do you know any means, or command, to list all CUI commands that are provided by default in your distro? That will presumably contain 'ls', 'rm', 'cp' and ...so on. I reminded that there are lots of documents in /usr/share/doc directory. So I checked if that should do with what I'm looking for, but there was no any document for 'ls' or 'cp' or whatnot.
2. Who decide what comands are included in distros by default when others not? I check man pages for 'ls', 'rm', 'od', 'paste', so on and it says, the it's core-utiles. It totally makes sense to me. They are essential. However, 'xxd' is installed by default while 'traceroute' isn't. So, in what standard and by whom is this process goes?
3. And, isn't all the GUI command comes with the kernel, right? So, shouldn't every CUI command be the same, right? No...?
4. So, what are these docs from /usr/share/doc for? Are they by any chance only for those packages I installed manually?