Many of us have written (and posted) code to build a "prefix" hash (a.k.a Trie indexes), but I wanted a quick command line to do this for word tokens over a set of short phrases. Allowing that Data::Dumper output would suffice, the solution was pretty short. (updated to fix the link to CPAN)
perl -MData::Dumper -lne '$i=\%h; for(split){$$i{$_}{N}++; $i=$$i{$_}}
 END{print Dumper(\%h)}'

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In reply to One-liner to build a Trie by graff

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