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<response_xml>
<exec_command>
<command>
...
</xml_show_result>
</exec_command>
</response_xml>

use XML::Simple qw(:strict);

my $xml = XMLin($tmpfile, ForceArray => 0, SuppressEmpty => 1, KeyAttr
+ => 'ru_resource' );
my $bandwidth =  $xml->{exec_command}->{xml_show_result}->{xml_show_re
+source_usage}->{ru_entry}->{bandwidth}->{ru_current};
print $bandwidth;

$VAR1 = {
          'exec_command' => {
                            'xml_show_result' => {
...
'
                          }
        };