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Perl: the Markov chain saw

Re: Return newest file

by cchampion (Curate)
on Aug 13, 2003 at 10:36 UTC ( #283502=note: print w/replies, xml ) Need Help??

in reply to Return newest file

You can get the last file in one go.

$last= (sort { -M $b <=> -M $a } <*.log>)[-1];

If you have a very large number of files, you may consider using the Schwartzian Transform to minimize sorting time.

$last = ( map { $_->[0] } sort { $b->[1] <=> $a->[1] } map { [ $_, -M $_ ] } <*.log> )[-1];

Both versions are short enough to be used in a one-liner.

Tested in Linux and Windows. Works fine.

Replies are listed 'Best First'.
Re: Re: Return newest file
by snax (Hermit) on Aug 13, 2003 at 20:29 UTC
    Why torture yourself to grab the last element when you can reverse the sort and grab the first? It strikes me as being semantically clearer as well:
    $newest = (sort { -M $a <=> -M $b } <*.log>)[0];
    Same story with the Schwartz trick.

    Of course, TIMTOWTDI :)

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