Fixing permissions, and adding exe check

src/epics/util/lib/createDiagsFile.pm

@@ -72,7 +72,12 @@ $rcg_parser .= $outputFile . " ";
 $rcg_parser .= $filteredOutputFile;
 
 system("sync");
-system($rcg_parser);
+my $parser_code=system($rcg_parser);
+if($parser_code != 0)
+{
+  print "Command $rcg_parser failed with an exit code of $parser_code\n";
+  exit($parser_code >> 8);
+}
 system("sync");
 
 # End DIAGNOSTIC