To pull a particular item to the front, you can use something like this:
my $first = 'run_this_first'; # or whatever
@filenames = sort { ($b eq $first) cmp ($a eq $first)
|| -M $b <=> -M $a } @filenames;
Or maybe something like this:
my %modtimes;
$modtimes{$_} = -M $_ foreach @filenames;
$modtimes{$first} = 1e99;
@filenames = sort { $modtimes{$b} <=> $modtimes{$a} } @filenames;
Whatever floats your boat.
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