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if ( $logfile =~ /WMS/ ) {
        $media = "wms";
...
} else {
        die "Unknown file format";
}

$media='wms';
$prefix = "/usr/home/script/${media}_cust/";
$suffix = ".$media.log";
die "logfile name does not contain 'WMS'\n" if $logfile !~ /WMS/;