Editor's Note: This tip was updated in May 2013 with a revised LISP file, which contains various minor enhancements and corrections.
Editor's Note: This tip was updated in April 2012 with a revised LISP file. The only change is that the revised RenameBlock.lsp now reports the current name of the selected Block when asking for a new one.
Frequent tipster Kent Cooper's latest contribution allows you to rename a block in AutoCAD without knowing the original name of the block. Why would you want to do that? Well, if you have ever pasted in geometry from another drawing as a block, AutoCAD assigns it a block name, but it is always something hard to remember, like A$CFG5D32S. If you have a few of these in your drawing, they become difficult to manage. Sure, you can rename them using the traditional method, but you have to know the current name before invoking the Rename command. To use this routine, load the LISP file, then type in the command RB. Now you can pick a block insertion on the screen and give it a new name without having to list its current name first.