in reply to hash of hashes
This is probably what you are looking for:
Output:use strict; my %byColor; while (<DATA>){ my ($fruit, @colors) = split; for my $c(@colors){ push @{ $byColor{$c} }, $fruit; } } for my $c(sort keys %byColor){ print "$c\t @{$byColor{$c}}\n"; } __DATA__ strawberry red green rose apple red rose mango green
green strawberry mango red strawberry apple rose strawberry apple
My goal ... to kill off the slow brain cells that are holding me back from synergizing my knowledge of vertically integrated mobile platforms in local cloud-based content management system datafication.
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Seekers of Perl Wisdom