local r = ""

    local function pairsByKeys (t, f)

        local a = {}

        for n in pairs(t) do table.insert(a, n) end

        table.sort(a, f)

        local i = 0      -- iterator variable

        local iter = function ()   -- iterator function

            i = i + 1

            if a[i] == nil then return nil

            else return a[i], t[a[i]]

            end

        end

        return iter

    end

    for name, obj in pairsByKeys(mcbot_get_command_list()) do

        if not obj.hidden then

            r = r .. string.format("%s\t%s\n", name, obj.desc or "")

        end

    end

    r = r:gsub("\n+$", "")

    return r