> Once I tried a tool like this, but just realized, there is already a method of that: the ~/bin folder.
One thing I'd add to this is that "crib notes" can be captured in man[0] pages. For example, having them in $HOME/man and ensuring MANPATH[1] includes it serves as a nice complement IMHO. There seems to be a markdown-based tool[2] which can assist in authoring them too.
EDIT: It looks like pandoc[3] can generate man pages from markdown as well.
https://github.com/rtomayko/ronn