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exec "nohup ./error_summariser.cgi $identifier > $default_files_dir/$i +dentifier/processing-log.txt &" or die "Can't exec: $!\n";
exec "nohup ./error_summariser.cgi $identifier > $default_files_dir/$i +dentifier/processing-log.txt 2>/dev/null &" or die "Can't exec: $!\n" +;