Legal notices:
- This sample program is intended as a demonstration only.
- The program is available on an 'as-is' basis with no warranties, either expressed or implied, of any kind.
- You may use the program only at your own risk.
- No license or rights to the program are either given or forfeited.
Everything that follows is direct and unaltered output from the LISP Generator.

; This program was created on November 22 2006 using the LISP Generator.

; Define the function (the program).
(defun c:CL ( / ENTITY1 LN OLDCE OLDERR OLDTE)
  ; Save the current value of cmdecho then redefine it.
  (setq OLDCE (getvar "cmdecho"))
  (setvar "cmdecho" 1)
  ; Save the current value of texteval then set it to 1
  (setq OLDTE (getvar "texteval"))
  (setvar "texteval" 1)
  ; Save the current value of the error handling subroutine then redefine it.
  (setq OLDERR *error*)
  (defun *error* (errmes)
    (princ (strcat "\nExecution of CL halted by the following error: " ERRMES))
    (setvar "cmdecho" OLDCE)
    (setq *error* OLDERR)
    (prin1)
  )
  ;(setq *error* nil)
  ; NOTE: to turn error handling off, erase the semicolon in the line above.

  ; GET a ENTITY from the user and store it in ENTITY1.
  (setq ENTITY1 (car (entsel "\nSelect object from which to extract the layer: ")))

  ; EXTRACT the Layer name from the entity ENTITY1 and store it in LN.
  (setq LN (cdr (assoc 8 (entget ENTITY1))))

  ; Input to AutoCAD's command line.
  (command
    "change"
  )
  (command
    (ssget)
    ""
    "p"
    "la"
    LN
    ""
  )

  ; Reset "cmdecho" to previous value.
  (setvar "cmdecho" OLDCE)
  ; Reset "texteval" to previous value.
  (setvar "texteval" OLDTE)
  ; Reset *error* to previous definition.
  (setq *error* OLDERR)
  ; Exit quietly (no return value.)
  (prin1)
)