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#!/usr/bin/perl -w

...
getopts('x:o:d:m:', \%switches);

print Dumper \%switches;

$ ./test.pl -o outputfile -x xmlfiles -d disk1 -m memory1         
$VAR1 = {
...
          'x' => 'xmlfiles',
          'o' => 'outputfile'
        };

#!/usr/bin/perl -w

...
}

print Dumper \%switches;

$ ./test.pl -o outputfile -x xmlfiles -d 'disk1 disk2' -m 'memory1 mem
+ory2'
$VAR1 = {
...
                   'outputfile'
                 ]
        };