How about this...
perl -e'print$_->[0]for sort{$b->[3]-$a->[3]}map[$_,split/:/],<>' /etc
+/passwd
With additional whitespace, that's...
perl -e'print $_->[0] for sort { $b->[3] - $a->[3] } map [$_, split /:
+/], <>' /etc/passwd
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
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