How about something like this...
open(IN, "hogfile.txt") or die $!;
while(<IN>)
{
$oldestline=$line;
$line=$newestline;
$newestline=$_;
if ($line =~ "terms you want")
{
## process oldestline and newestline for more matches
}
}
Agustin Rivera
Webmaster, Pollstar.com
http://www.pollstar.com
----- Original Message -----
From: "Hans Holtan" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, February 28, 2002 9:13 AM
Subject: searching a large file
> I am having a problem searching a large (600 mb) text file. What I
> need to do is find a match with a short bit of text and then look up
> to 200 characters forwards and backwards for other matches to
> different short bits of text. I tried reading the file to memory
> first and then doing the search, but it's a serious hog, and I need
> to leave a lot of memory open for other operations. Does anyone have
> suggestions on how I can do this while limiting memory usage, speed
> is a factor but not paramount.
> Thanks,
> Hans
> --
>
>
>
> ________________________________________________
>
> Hans E. E. Holtan
> Graduate Student
> UC Berkeley-Department of Plant and Microbial Biology
> Plant Gene Expression Center
> 800 Buchanan Street
> Albany, California 94710
> U. S. A.
> Phone: (510) 559-5922
> FAX: (510) 559-6089
> [EMAIL PROTECTED]
> _________________________________________________
>
> --
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
--
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
