$file = "/Users/me/Desktop/test.txt";
$printer = "HP_DESKJET_930C";
system ("lp -d $printer $file");

##</code><code>##

$file = "/Users/me/Desktop/test.xls";
$printer = "HP_DESKJET_930C";
system ("lp -d $printer $file");

##</code><code>##

$file = "/Users/me/Desktop/test.xls";
$printer = "HP_DESKJET_930C";
if (system ("open $file")) {
 system ("lp -d $printer $file"); }