How can I rename several layers at once?

When there are several layers in a drawing that need to be renamed, the best and fastest way is to use the rename command. The first thing that you have to do is to type "rename" or "ddrename" ant the command prompt. Then, make sure that "Layers" is highlighted in the Named Objects listbox. In the "Items" listbox is a list of all of the layer names in the current drawing. Let's say that you the following list of layers: "Dim", "Doors", "Text", and "Walls". You wanted to rename all of the layers so that a "C-" preceeded the layer name like "C-Dim" for example. In the "Old Name" textbox, you would put a "*" in this box which tells AutoCad to select all of the layers in the current drawing. Then, go to the textbox under the "Old Name" textbox and put in "C-*" This tells AutoCAD to put a "C-" in front of every layer in the current drawing. Now, press the "Rename To:" button and Press "OK". You layers should now look like the following: "C-Dim", "C-Doors", "C-Text", and "C-Walls".