First pre-process the output, getting the last page created, and store this in a macro variable. This macro variable can then be applied in the style element Pagesitem by using the POSTTEXT= attribute. Below is the example code to do this. View output.

   filename temp 'c:\test\temp.txt';
   proc printto print=temp new;

   proc print data=sashelp.class;
   run;

   proc printto;
   run;

   data _null_;
     infile temp truncover;
     input record $1-200;
     call symput('lastpage',
          trim(left(put(input(reverse(scan(reverse(record),1)),6.)-1,6.))));
     stop;
   run;
   %let lastpage=%eval(&lastpage-1);

   proc template;
     define style styles.test;
     parent=styles.default;
       style pagesitem from indexitem /
             posttext=" of &lastpage";
   end;
   run;

   ods html body='bod.html'
       contents='cont.html'
       page='page.html'
       newfile=page style=styles.test;

   proc sort data=sashelp.class out=temp;
     by age;

   proc freq data=temp;
     by age;
   run;

   ods html close;

See also the full PROC TEMPLATE FAQ and Concepts.

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