I know that I could probably use a hash instead, but don't want to use a hash
The only time a hash is not acceptible for something like this, is when you want to maintain the original insertion order. If you don't, then follow tlm's advice and use that.
If, however, you need to maintain the original order, the easiest solution is to use both a hash and an array. You may be thinking, "this sounds like a real pain." But it's not. Here's a demonstration:
my %mountpoints;
my @mountpoints;
for (qw(foo bar bar foo baz)) {
push @mountpoints, $_ unless $mountpoints{$_}++;
}
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