Well, there're samples... in the screenshots. For user info* gotta check the linked manual, which also has a comparison page to POSIX shell[0]. It's basically a slightly different, no doubt improved, POSIX shell. On one hand it's easier to transition to. On other hand it's incompatible enough to create headaches. (And the big competitor is Bash/Zsh not sh.) Considering there're packages for Ubuntu, it is not Redox-only.

Nushell is certainly a better fit to be called modern shell but, even not considering the structured design, is much more different.

*Kinda makes sense as source repos are meant for devs; end-users should be checking manuals/sites instead. We're just used for repos' READMEs to be functionally similar to projects homepages.

[0]: https://doc.redox-os.org/ion-manual/migrating.html