I hope this isn't a duplicate and I have tried to search Google for the response and am out of ideas where to go. So here it goes...
When I am working on a project I like to try and solve my own problems myself. I find it more rewarding to find the solution myself than find the answer on SE or similar sites.
I typically use man whatis whereis to the best of my ability. I often will just type man and use tab completion to see all the pages available and try to find corresponding commands. So I guess what I am looking for is there a whatdoes command. So for example is there a way to find all the commands that process text or all commands that perform disk operations.
I know this is probably a dumb question and the answer will be NO but I figured it was worth a try...
man grepif they didn't know about thegrepcommand in the first place? The man page is useful if you want to do something and you knowgrepcan do something similar.