Lists

[Eugene Tsyrklevich]

~sdpm~
if your logs are sorted by date and you just want to extract the last 3 lines you can do smth like:

@ARGV = '/path/to/logfile';
undef $/;

for ((split /\n/, <>)[-3..-1]) {
        my ($Date, $Time, $Host, $ftpput, $ftpget, $pingloss, $pingavg)
                = split;

        print "$Date $Time $Host yadda yadda\n";
}

the above code is very memory inefficient so it might not work well for big log files.


check out this webpages:

http://www.perl.com/CPAN-local/doc/manual/html/pod/perlsyn.html
http://www.perl.com/CPAN-local/doc/manual/html/pod/perlfunc/split.html
http://www.perl.com/CPAN-local/doc/manual/html/pod/perlfunc/sort.html

finally here is an excellent paper on sorting:
http://www.perl.com/CPAN-local/doc/FMTEYEWTK/sort.html


cheers.


On Thu, May 25, 2000 at 06:11:29PM -0700, Steve Meier wrote:
> 
> Hey all,
> 
> Could anyone tell me what the easiest way to sort through this list
> would be. What I have is a log file that looks like this:
> 
> 5/25/2000 17:28:37 HostA 2250.16 2136.20 0  0
> 5/25/2000 17:28:52 HostB 905.77 928.76 0  0
> 5/25/2000 17:29:11 HostC 3632.60 3300.78 0  0
> 5/25/2000 18:28:37 HostA 2250.16 2136.20 0  0
> 5/25/2000 18:28:52 HostB 905.77 928.76 0  0
> 5/25/2000 18:29:11 HostC 3632.60 3300.78 0  0
> 
> So for instance, I want to select the most current lines (the last
> three).
> 
> Split them into there respective variables $Date $Time $Host $ftpput
> $ftpget $pingloss $pingavg
> 
> Then loop them through a table to display the results on a webpage.
> 
> Thanks for your help,
> 
> Steve

Content-Description: Card for Steve Meier

~sdpm~

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