So, I am trying to learn one liners. I start with the following trivial script that loops over a DATA handle and prints out all the uniq words. 

#!/usr/local/bin/perl

while(<DATA>) {
    /(\w*)/;
    $i{$1}++;
}

print "$_\n" for keys %i;

__DATA__
foo
bar
baz
qux
foo
foo
bar
baz
qux

[download]

Now, I want to convert this into a one liner, assuming the words are in a separate file called words.txt. So, I tried the following and failed 

perl -nle '/(\w*)/;$i{$1}++;print for keys %i;' words.txt

[download]

The reason, of course, is that %i is not remembered from one iteration to the other. How do I create this one liner?

--

when small people start casting long shadows, it is time to go to bed

In reply to global vars and one liners by punkish

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