@SKIP = ('adrian','adm','sys','alcatel');
foreach $login ($SKIP) {
    next if $login eq $SKIP;
}
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You're not iteratating over the array @SKIP, but the scalar $SKIP (which I don't see defined in your code). These are two completely seperate values, though they share a typeglob.

use strict would have caught this error, unless $SKIP is defined elsewhere in your code (which I think you meant to do, since that's what you're comparing $login to).

You could also do what you want with:

@SKIP = grep { $_ ne $SKIP } 'adrian','adm','sys','alcatel';
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