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#!/usr/bin/perl -w

...
foreach my $pName ($ref->{wrapper}->{$wrapName}->{envVar}) {
    print $pName;
}

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<config>
    <wrapper name="testName 1.0.3" script="/usr/people/ltorvalds/wrapp
+er.pl" app="/usr/bin/testApp.exe">
...
        <parm name="of" value="\$fileExt"/>
    </wrapper>
</config>