_sasunit_tempfilename.sas

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%MACRO _sasunit_tempFileName(r_TempFile);

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

/* store to macro variable */
%LET &r_TempFile=&syslast;
%PUT 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 _sasunit_tempFileName;