CC-Tweaked/src/main/resources/data/computercraft/lua/rom/programs/id.lua

local sDrive = nil
local tArgs = { ... }
if #tArgs > 0 then
    sDrive = tostring( tArgs[1] )
end

if sDrive == nil then
    print( "This is computer #"..os.getComputerID() )

    local label = os.getComputerLabel()
    if label then
        print( "This computer is labelled \""..label.."\"" )
    end

else
    local bData = disk.hasData( sDrive )
    if not bData then
        print( "No disk in drive "..sDrive )
        return
    end

    print( "The disk is #"..disk.getID( sDrive ) )

    local label = disk.getLabel( sDrive )
    if label then
        print( "The disk is labelled \""..label.."\"" )
    end
end