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Using different modules, Time::Local and POSIX, is a direct way to compute today's date in UTC to compare to the dates in the file which are UTC. That avoids all the function calls in the loop you built, which really slow down the program.

#!/usr/bin/perl use strict; use warnings; use Time::Local qw/ timegm_nocheck /; use POSIX qw/ strftime /; my $n = 4; my ($d, $m, $y) = (gmtime)[3..5]; my $gmtime = strftime "%d/%b/%Y", gmtime timegm_nocheck 0,0,0, $d-$n, +$m, $y; $gmtime =~ s/^(?:0| )//; while(<DATA>){ print if /$gmtime\b/; }

But to impliment some of the time saving 'tricks' suggested by others in this thread would involve a while loop with more code.


In reply to Re: Optimise the script by Cristoforo
in thread Optimise the script by Anonymous Monk

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    [Corion]: 1nickt: Would be great, especially for naming parameters in @_.
    [Corion]: When you pass an arrayref, you get to treat it like a local array. But then, I'm cautious with the experimental features, because just when I thought function signatures were a set thing, there is a proposal to use sub [ $foo, $bar ] { ... } to ...
    [Corion]: ... declare the parameters, instead of the more common sub ($foo, $bar) { ... }

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