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# Sorts files in $dir and sets $latest->{file} with newest file.
my $latest = (sort {$b->{mtime} <=> $a->{mtime}}
...
map {{mtime => -M $_, file => $_}}
<$dir/*>)[-1];
my $oldM = (stat $oldest->{file})[9];

my ($newM, $oldM) = (sort {-M $a <=> -M $b} <./*>)[0,-1];