Date:         Tue, 5 Mar 2002 14:23:47 -0500
Reply-To:     "Carriere, Ron" <rcarriere@MEDNET.UCLA.EDU>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         "Carriere, Ron" <rcarriere@MEDNET.UCLA.EDU>
Subject:      How to read previous lines based upon string in current line.

I have dataset that consists of 40K+ lines of MVS JCL.  I am attempting to
output a list of datasets cataloged by that JCL.  Pseudo code for the task
would be

    Read a line;

     IF a line contains the string "CATLG" then do;
         if  line contains "dsn=' then
              output the line;
          else  do;
             read and then output the two previous and then the
             current line;
          end;
     end;

The "else do" part is required because the dataset name is sometimes on
one of the two previous lines.  That is part I can't accomplish without
sorting and resorting the dataset, but there must be a better way using
line pointer controls, no?

Ron Carriere
UCLA Medical Center