Use ++$h{$_} instead of $h{$_}++ so the incrementing is done first, before the compare. $h{$_}++ returns the value, which is numerically 0 the first time through, then increments the value. This causes things seen only once to be ignored. 
@toBeMoved = sort {$a <=> $b} grep {++$h{$_} == 1} @toBeMoved;

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- Tom

In reply to Re: Unique Array Items by tcf22
in thread Unique Array Items by Anonymous Monk

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