; The following program is sample output from the LISP Generator (more info at www.LispGen.com). 
; The LISP Generator is a full-featured code generator for Autocad's AuotLISP language.
; 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.
; - The program may only be used at the user's own risk.
; - No license or rights to the code are either given or forfeited.
; Everything that follows is direct and unaltered output from the LISP Generator.

; This program was created on December 8 2006 using the LISP Generator.

; Define the function (the program). 
(defun c:ROT-MANY ( / SS1 ANG1 OBJ I PT1 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 ROT-MANY 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 SELECTION from the user and store it in SS1. 
  (princ "\nSelect objects to rotate: ")
  (setq SS1 (ssget))

  ; GET a DEGREES from the user and store it in ANG1. 
  (setq ANG1 (getangle "\nAngle of rotation: "))
  (setq ANG1 (* (/ ANG1 PI) 180.0))

  ; BEGIN LOOP loop1.
  ; LOOP by STEPPING THROUGH the OBJECTS of SELECTION-SET SS1, reading them into OBJ. 
  (setq I -1)
  (while (setq OBJ (ssname SS1 (setq I (1+ I))))

    ; EXTRACT the Start point from the entity OBJ and store it in PT1.
    (setq PT1 (cdr (assoc 10 (entget OBJ)))) 

    ; Input to AutoCAD's command line. 
    (command
      "rotate"
      OBJ
      ""
      PT1
      ANG1
    )

  ) ; END LOOP loop1.
  ; 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)
)