There appears to be a lot of variation in how complete the "partially done" commands are. For example od seems fairly complete, but date doesn't even support simple usages like date +%Y%m%d, and sort seems to have a good selection of options, but is missing some relatively important ones like sort keys.

It would be really useful if there were some documentation clarifying how complete the partially done commands are, to help people understand what's available (I am looking for Windows equivalents of Unix commands, and would, for example, use this project for many of them, but would probably not install date as it stands, or only make it available via the uutils command).