$cmd --help; man "$cmd"|col -b

_man.fish

# https://fishshell.com/docs/current/tutorial.html#tut_autoload
function _man
    if type "$argv[1]" >/dev/null
        if type "$argv[1]" | grep -m 1 " is a function with definition\$" >/dev/null
            type "$argv[1]" >&2
        else
            if test "nginx" = "$argv[1]"
                "$argv[1]" -h 2>&1; echo -e "\n"
            else if test "echo" != "$argv[1]"
                "$argv[1]" --help 2>&1; echo -e "\n"
            end
            man "$argv[1]" 2>&1 | col -b
        end
    else
        man "$argv[1]" 2>&1 | col -b
    end
end