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  Open both files
  Read each line from the first file
  Split it into mount point, total space, used space, free space
  Do the same for the second file
  Compare matching mount points to see the differences.

open( my $firstfile,  '<', "DFLOG1.txt"); 
open( my $secondfile, '<', "DFLOG2.txt"); 
...
    }
    return %result;
}