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my $cmd = "cat /tmp/win.log /tmp/lnx.log | grep -v "/" . $nextmonth . 
+"/" | sort -k4.2 > /export/w3logs/" . $year . $month . ".log";
system($cmd);

open the log files and the output file.
read in each log file into a hash with the key based on the date of th
+e item
sort the hash keys and write the values to the output file