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Instruction on the usage of acad.lsp
(It works for other versions (2000 and later) of AutoCAD and verticals as
well)
From the Help in AutoCAD 2008
You can create an acad.lsp file if you regularly use specific AutoLISP
routines. When you start AutoCAD, it searches the support file search path for
an acad.lsp file. If an acad.lsp file is found, it is loaded into memory.
The acad.lsp file is loaded at each drawing session startup when AutoCAD is
launched. Because the acad.lsp file is intended to be used for
application-specific startup routines, all functions and variables defined in an
acad.lsp file are only available in the first drawing. You will probably want to
move routines that should be available in all documents from your acad.lsp file
into the acaddoc.lsp file.
The recommended functionality of acad.lsp and acaddoc.lsp can be overridden with
the ACADLSPASDOC system variable. If the ACADLSPASDOC system variable is set to
0 (the default setting), the acad.lsp file is loaded just once: upon application
startup. If ACADLSPASDOC is set to 1, the acad.lsp file is reloaded with each
new drawing.
The acad.lsp file can contain AutoLISP code for one or more routines, or just a
series of load function calls. The latter method is preferable, because
modification is easier. If you save the following code as an acad.lsp file, the
files mysessionapp1.lsp, databasesynch.lsp, and drawingmanager.lsp are loaded
every time you start AutoCAD.
(load "mysessionapp1")
(load "databasesynch")
(load "drawingmanager"
Warning Do not modify the reserved acad2008.lsp file. Autodesk provides the
acad2008.lsp file, which contains AutoLISP defined functions that are required
by AutoCAD. This file is loaded into memory immediately before the acad.lsp file
is loaded.
How to create acad.lsp if it does not exist
In the folder where you want to save acad.lsp right click and select
New>Text Document. Change the name to acad.lsp. Now you should be able to
double click on the file and typically edit it in Notepad.
Or start Notepad, edit, save, ready.
Examples on location for acad.lsp
C:\Program Files\AutoCAD 2008\Support
C:\Documents and Settings\<loginname>\Application Data\Autodesk\AutoCAD
2008\R17.1\enu\Support
or in Windows Vista
C:\Users\<loginname>\AppData\Roaming\Autodesk\AutoCAD 2008\R17.1\enu\Support
If you want to find folders that are searched by AutoCAD run the OPTIONS
command and look at the Files tab and at the Support File Search Path.
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