clearmv.sas

/*
 * Richard A. DeVenezia
 * 6/16/1999
 *
 * Use %symdel mvar in version 8.2+
 */

%macro clearmv;

  %local __dsid__ __rc__ __mvar__;

  %let __dsid__ = %sysfunc (open (SASHELP.VMACRO(where=(scope='GLOBAL'))));
  %if &__dsid__ %then %do;
    %do %while (0 = %sysfunc (fetch (&__dsid__)));
      %let __mvar__ = %sysfunc (getvarc(&__dsid__,2));
      %if (&__mvar__ eq __DSID__ or &__mvar__ eq __RC__ or &__mvar__ eq __MVAR__)
      %then
        %put WARNING: &__mvar__ cannot be cleared.;
      %else
        %let &__mvar__=;
    %end;
    %let __rc__ = %sysfunc (close(&__dsid__));
  %end;
  %else
    %put ERROR: Could not open SASHELP.VMACRO;

%mend clearmv;

/*
%let x=2;
%put x=&x;
%clearmv;
%put x=&x;

%symdel x;
%put x=&x;
*/