AUTOLISP QUICK REFERENCE CHART                                                                                          PAGE 1. 


(+ <NUMBER> <NUMBER> ...)                Returns the sum of two or more numbers.
(- <NUMBER> <NUMBER> ...)                Returns the difference of two or more numbers. 
(* <NUMBER> <NUMBER> ...)                Returns the product of two or more numbers.
(/ <NUMBER> <NUMBER> ...)                Returns the quotient of two or more numbers. 
(= <NUMBER> <NUMBER> ...)                Returns T if the numbers are equal, nil if not.
(/= <NUMB1> <NUMB2>)                     Returns T if the numbers are not equal, nil if they are. 
(< <NUMB1> <NUMB2>)                      Returns T if <NUMB1> is less than <NUMB2>. 
(<= <NUMB1> <NUMB2>)                     Returns T if <NUMB1> is equal to or less than <NUMB2>.
(> <NUMB1> <NUMB2>)                      Returns T if <NUMB1>is greater than <NUMB2>. 
(>= <NUMB1> <NUMB2>)                     Returns T if <NUMB1> is equal to or greater than <NUMB2>.
(~ <NUMBER>)                             Returns the bitwise of <NUMBER>. 
(1+ <NUMBER>)                            Returns the <NUMBER> increased by one. 
(1- <NUMBER>)                            Returns the <NUMBER> decreased by one. 
(abs <NUMBER>)                           Returns the absolute value of <NUMBER>.
(and <EXPR> ...)                         Returns the logical AND of a list of expressions. Returns nil if expressions are nil.
(angle <PT1> <PT2>)                      Returns the angle in radians between two points. 
(angtos <ANGLE>[<MODE><PRECIS.>])        Returns the angle as a string. Mode 0=Degrees,1=Deg Min Sec,2=Grads,3=Radians,4=Surveyor
(append <EXPR> ....)                     Returns a number of lists as one list.
(apply <FUNCTION> <LIST>)                Executes function with the arguments given as a list.
(ascii <STRING>)                         Returns ascii value of first character of a string. 
(assoc <ITEM><ALIST>)                    Searches <ALIST> for <ITEM>.
(atan <NUM1> [<NUM2>])                   Returns the arctangent of <NUM1> or <NUM1>/<NUM2>.
(atof <STRING>)                          Returns the conversion of a string into a real. 
(atoi <STRING>)                          Returns the conversion of a string into an integer. 
(atom <ITEM>)                            Returns T if <ITEM> is not a list.
(Boole <FUNC> <NUMB1> <NUMB2)            Returns Boolean bitwise truth comparisons. <NUMB>'s must be integers.
(boundp <ATOM>)                          Returns T if <ATOM> has a value bound to it.
(car <LIST>)                             Returns the first element of a list.
(caar <LIST>)                            Returns first element of the first element of a list.
(cadar <LIST>)                           Returns last element of the first element of a list.
(cadr <LIST>)                            Returns the second element of a list. 
(caddr <LIST>)                           Returns the third element of a list.
(cdr <LIST>)                             Returns all but the first element of a list.
(cdar <LIST>)                            Returns second element of the first element of list.
(cddr <LIST>)                            Returns all but first element of last element list. 
(chr <NUMBER>)                           Returns the string represented by an ascii value. 
(close <FILENAME>)                       Closes a file.
(command <ARGS>...)                      Executes an AutoCAD command.
(cond (<TEST1><RESULT1>)...)             Evaluates any number of lists as arguments. 
(cons <NEW FIRST ELEMENT><LIST>)         Contructs a new list. 
(cos <ANGLE>)                            Returns the cosine of an angle. 
(defun <SYM><ARG LIST><EXPR>...)         Defines an AutoLISP function. 
(distance <PT1> <PT2>)                   Returns the distance between two points.
(entnext [<ENAME>])                      Returns the first non-deleted entity after <ENAME>. 
(entlast)                                Returns the last non-deleted entity in the database.
(entsel [<PROMPT>])                      Selects a single entity by a point pick.
(entdel <ENAME>)                         Deletes the entity <ENAME> or undeletes it if it has already been deleted.
(entget <ENAME>)                         Returns <ENAME> from the database as a list.
(entmod <ENAME>)                         Updates <ENAME> in the database. NOT for blocks or polylines
(entupd <ENAME>)                         Updates <ENAME> in the database. Use for polylines or blocks. 
(eq <EXPR1> <EXPR2>)                     Returns T if expressions are bound to same object.
(equal <EXPR1> <EXPR2>)                  Returns T if the expressions are equal. 
(eval <EXPR>)                            Evalutes an expression. 
(exp <NUMBER>)                           Returns E to the power <NUMBER>. 
(expt <BASE> <NUMBER>)                   Returns <BASE> to the power <NUMBER>.
(findfile <FILENAME>)                    Searches all paths to find <FILENAME>. 

AUTOLISP QUICK REFERENCE CHART                                                                                          PAGE 2. 


(fix <NUMBER>)                           Converts <NUMBER> to an integer. 
(float <NUMBER>)                         Converts <NUMBER> to a real. 
(foreach <NAME><LIST><EXPR>)             Evaluates <EXPR> for each element in the <LIST> and assigns to <NAME>.
(gcd <NUM1> <NUM2>)                      Returns the greatest common denominator. 
(getangle [<PT>][<PROMPT>])              Pauses for input of an angle at optional starting point <PT>. 
(getcorner [<PT>][<PROMPT>])             Getpoint function - draws triangle as crosshairs move. 
(getdist [<PT>][<PROMPT>])               Pauses for input of distance at optional start point. 
(getenv [<VARIABLE>])                    Returns string value assigned to a system variable.
(getkword [<PROMPT>])                    Requests a keyword from the user.
(getorient [<PT>][<PROMPT>])             Returns angle in radians from current orientation.
(getpoint [<PT>][<PROMPT>])              Pauses for input of an angle at optional point <PT>.
(getreal [<PROMPT>])                     Pauses for input of a real number.
(getstring [<CR>][<PROMPT>])             Pauses for input of a string.
(getvar <varname>)                       Retrieves the value of an AutoCAD system variable. 
(graphscr)                               Flips from text screen to graphics screen. 
(grclear)                                Clears the graphics screen.
(grdraw <from><to><color>[<highlight>])  Draws a vector between two points. 
(grtext <box><text><highlight>])         Write to text portion of graphics screen.
(grread <track>)                         Allows AutoLISP to read AutoCADs input devices.
(if <testexpr><thenexpr>[<elseexpr>])    Conditionally evaluates expressions. 
(inters <pt1><pt2><pt3><pt4>[<onseg>])   Returns the intersection point of two lines.If <ONSEG> is greater than 0 the intersection 
                                            may lie past the endpoints of the lines. 
(itoa <number>)                          Returns the conversion of an integer to a string.
(lambda <arguments><expr>...)            Defines an "anonymous" function. 
(last <list>)                            Returns the last element in <LIST>.                         
(length <list>)                          Returns the number of elements in <LIST>.
(list <expr>)                            Returns the list of a number of expressions. 
(listp <list>)                           Returns T if the item is a list. 
(load <filename>)                        Loads an AutoLISP program in memory. 
(log <number>)                           Returns natural log of <NUMBER> as a real. 
(logand <number><number>...)             Returns the logical bitwise AND of a list of numbers.
(logior <number><number>...)             Returns the logical bitwise OR of a list of numbers. 
(lsh <numb1><numbits>)                   Returns the logical bitwise SHIFT operator of <NUM1> by <NUMBITS>. 
(mapcar <function><list1>...<listn>)     Executes <FUNCTION> on the elements of <LIST1> through <LIST2>.
(max <number><number>...)                Returns the maximum of the numbers given.
(member <expr><list>)                    Searches <LIST> for first occurence of <EXPR> and returns the remainder of the list.               
(menucmd <string>)                       Switch between pages in an AutoCAD menu. 
(min <NUMBER><NUMBER>...)                Returns the smallest of the numbers given. 
(minusp <ITEM>)                          Returns T if the item is negative. 
(not <ITEM>)                             Returns T if the expression is nil.
(nth <n><LIST>)                          Returns the "nth" element of <LIST>. 
(null <ITEM>)                            Returns T if <ITEM> is bound to nil. 
(numberp <ITEM>)                         Returns T if <ITEM> is an integer or a real. 
(open <FILENAME><MODE>)                  Opens a file.
(or <EXPR>...)                           Returns the logical OR of a list of expressions. 
(osnap <PT><MODE-STRING>)                Returns a point by applying the osnap command. 
(polor <PT><ANGLE><DISTANCE>)            Returns point at <ANGLE> and <DISTANCE> from <PT>. 
(prin1 <EXPR>[<FILENAME>])               Prints <EXPR> on the screen or to <FILENAME>. 
(princ <EXPR>[<FILENAME>])               Same as prin1 except control character are printed without expansion.
(print <EXPR>[<FILENAME>])               Same as prin1 except a new line is printed before <EXPR> and a space is printed after.
(progn <EXPR>...)                        Evalutes each expression sequentially. 
(prompt <MSG>)                           Displays <MSG> on the screen PROMPT area.
(quote <EXPR>)                           Returns <EXPR> unevaluated.
(read <STRING>)                          Returns the first LIST obtained from <STRING>. 
(read-char [<FILENAME>])                 Returns a character from the keyboard buffer or from <FILENAME>.
(read-line [<FILENAME>])                 Returns a string from the keyboard buffer or from <FILENAME>.
(redraw [<ENAME>][<MODE>])               Redraws either entire drawing, or <ENAME> in <MODE>. 

AUTOLISP QUICK REFERENCE CHART                                                                                          PAGE 3. 


(rem <NUM1> <NUM2> ...)                  Returns the remainder of <NUM1>/<NUM2>.
(repeat <NUMBER> <EXPR> ...)             Evaluates each expression <NUMBER> times.
(reverse <LIST>)                         Returns a list reversed. 
(rtos <NUMBER> [<MODE><PRECIS>])         Returns a real number as a string. 
(set <SYM><EXPR>)                        Sets the value of a sysmbol name.
(setq <SYM1><EXPR1>...)                  Sets the value of <SYM1> to <EXPR1>. 
(setvar <VARNAME><VALUE>)                Sets a system variable to <VALUE>. 
(sin <ANGLE>)                            Returns the sine of an angle.
(sqrt <NUMBER>)                          Returns the square root of <NUMBER>. 
(ssget [<MODE>][<PT1><PT2>])             Returns a selection set. 
(sslength <SS>)                          Returns the number of entities in selection set <SS>.
(ssname <SS><INDEX>)                     Returns the name of the <INDEX>th entity in selection set <SS>. 
(ssadd [<ENAME>][<SS>])                  Adds entities to selections sets.
(ssdel [<ENAME>][<SS>])                  Deletes entities from selections sets. 
(ssmemb [<ENAME>][<SS>])                 Returns <ENAME> if <ENAME> is a member of selections set <SS>.
(strcase <STRING>[<WHICH>)]              Returns <STRING> as upper case if <WHICH> is nill. If <WHICH> is not nill the returned 
                                            string will be all lower case. 
(strcat <STRING1><STRING2>..)            Concatenates a series of strings.
(strlen <STRING>)                        Returns the number of characters in a string.
(subst <NEWITEM><OLDITEM><LIST>)         Substitutes <NEWITEM> for <OLDITEM> in <LIST>. 
(substr <STRING><START><LENGTH>)         Returns a substring of <STRING> begining at <START> of <LENGTH> characters. 
(tblnext <NAME> [<rewind>])              Scans symbol table for next entity.
(tblsearch <NAME><SYM>[<setnext>])       Searches entire symbol table for <NAME>.
(terpri)                                 Prints a new line on the screen. 
(textscr)                                Flips from graphics screen to text screen. 
(trace <FUNCTIONS>...)                   Debugging aid that returns the last function name. 
(trans <PT><FROM><TO>[<DISP>])           Translates a point <PT> from one coordinate system to another.
(type <ITEM>)                            Returns the type of <ITEM>.
(untrace <FUNCTIONS>...)                 Clears the trace floag for <FUNCTIONS>.
(ver)                                    Returns AutoLISP version number. 
(vports)                                 Returns a list of currently active viewports.
(while <TESTEXPR><EXPR>)                 Evalutes <TESTEXPR> and if not nill executes <EXPR>. 
(write-char <NUM> [<FILENAME>])          Writes the character represented by the ASCII value of <NUM> to the screen or to <FILENAME>.
(write-line <STRING> [<FILENAME>])       Writes <STRING> to the screen or to <FILENAME>.
(vmon)                                   Enables AutoLISP virtual function pager. 
(zerop <ITEM>)                           Returns T if <ITEM> evaluates to zero. 
(*error* <STRING>)                       User-definable error function.