This looks great! If I might suggest something: Maybe you'd like to investigate different layouts for different use cases? The alphabetical ordering of builtin

This looks great! If I might suggest something: Maybe you'd like to investigate different layouts for different use cases? The alphabetical ordering of builtins e.g. will mainly help you if you encounter it, but don't know what it does. For more exploratory/educational lookup attempts, perhaps it could be useful to group them together by their use? I'm fairly certain, for example, that grouping `cd` together with `pushd` and `popd` might help someone avoid some rather nasty bugs in their script. Maybe, even a "see also" in the direction of subshells could help (as `cd` only affects the commands in the subshell). And, on a sidenote: Interestingly, one can find similar "lookup problems" all over the place. For instance, any good guide to morse code will show you an alphabetical list of codes (text -> morse code) as well as a morse tree (morse code -> text) :)