# With each line in @unsorted
@sorted = sort @unsorted;

# With all lines in $unsorted, maybe use IO::String
my $S = new IO::String \$unsorted;
@sorted = sort <$S>;

# Or just split on newlines, maybe reversed too:
@sorted = reverse sort split $/, $unsorted;
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Well, there's always Far More Than Everything You've Ever Wanted to Know About Sorting.

Greetz
Beatnik
... Quidquid perl dictum sit, altum viditur.