_tempfilename.sas

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%MACRO _tempFileName(r_TempFile);

   /* create empty dataset */
   DATA;STOP;RUN;

   /* store to macro variable */
   %LET &r_TempFile=&syslast;
   %PUT &g_note.(SASUNIT): Temporary dataset %nrstr(&)&r_tempFile is &&&r_tempFile;

   /* delete again, need only name */
   PROC SQL NOPRINT; 
      DROP TABLE &&&r_TempFile;
   QUIT;

   /* store number of first dataset to l_first_temp */
   %IF %symexist (l_first_temp) %THEN %DO;
      %IF &l_first_temp = %THEN %LET l_first_temp = %substr(&syslast,10);
   %END;

%MEND _tempFileName;