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#! perl
#  File: application.pl
...
my $code = $ARGV[0] // 0;
printf "In application: result = '%5d' (decimal) or '%016b' (binary)\n
+", $code, $code;
exit $code;

#! perl
#  File: driver.pl
...
my $result = system(@app);
printf "In driver:      result = '%5d' (decimal) or '%016b' (binary)\n
+", $result, $result;
printf "                >> 8   = '%5d' (decimal) or '%016b' (binary)\n
+", ($result >> 8), ($result >> 8);

perl driver.pl 255

In application: result = '  255' (decimal) or '0000000011111111' (bina
+ry)
In driver:      result = '65280' (decimal) or '1111111100000000' (bina
+ry)
                >> 8   = '  255' (decimal) or '0000000011111111' (bina
+ry)

my $result = system(@app);