I comment the commands that I want and then use vim to remove ones without comments.

For example, I run:

longandannoyingcommand -f1 -f2 -f3 # keep, does something useful

Usually comment explains what the command does so I can find it by description using fzf history search. And then you can easily find all lines that contain (or do not contain “# keep”) in your history to remove or keep.

I might try this. Normally would just pipe history into grep to search or scroll till I found the right command. Also smite is a great name for that function.