Using AutoCAD's free ScriptPro, you can apply a set of commands to multiple drawings by simply specifying a script file and the list of drawings that you would like to apply the script to. But ScriptPro isn't compatible with 64-bit. AutoScript is compatible with 64-bit. And AutoScript for AutoCAD is a free AutoCAD add-in. You can use AutoScript as AutoCAD's free ScriptPro.