What you're getting at seems to be more about CLI conventions as opposed to script conventions specifically. As such, you might want to have a look at https://clig.dev/ which is a really comprehensive document describing CLI guidelines. I can't say I've read the whole thing yet, but everything I _have_ read very much made sense.

It's been discussed here on HN before.

https://news.ycombinator.com/item?id=25304257