Also consider using [`apropos`][1] to "search the [_whatis_][2] database for strings" that can help find the right command.

Use the `-t` option of man to "format the manual  page" in a manner that `Preview.app` can display:

    man -t apropos | open -f -a Preview.app

[![image][3]][3] 


  [1]: https://ss64.com/osx/apropos.html
  [2]: https://ss64.com/osx/whatis.html
  [3]: https://i.sstatic.net/gOfmk.png