Is there any script to select all layers?

I want to hide all layers through scripting. Firstly I have to select all layers for the same.

So, Can any1 tell me command to select all layers?

A very simple script...

-LAYER
OFF
*
Y

or in macro

^C^C_-LAYER;OFF;*;Y;

The last 'Y' is to turn the current layer off too, if not put 'N' at the end.

thank you, it is indeed a great help.

Can you tell me, commands to create filters?

If you're talking about Layer Filters from Layer Properties Manager the answer is LISP; you cannot use command line for filters.

I've found this about making layer filter with LISP: http://forums.autodesk.com/t5/Visual-LISP-AutoLISP-and-General/Make-Layer-Filter-Lisp/m-p/1563704

But the question is what do you need filters for? Maybe three is different solution for your goal.

What about "layiso" Isolate a layer then turn them back on can pick 1 2 3 etc

Question if you turn off all layers wont dwg be a blank screen ?

-la can also use wild cards -la off w*