[Okta Webinar] Learn how to a build a cloud-first strategyRegister Now

x
?
Solved

creating a hash

Posted on 2000-03-25
1
Medium Priority
?
181 Views
Last Modified: 2010-03-05
I have a file containing IP addresses. I want to read a file, and make a hash with IPs being the keys and the number of times that IP appears in the file as the value. So a file like this:


0.0.0.0
1.2.3.4
0.0.0.0
4.5.6.7
0.0.0.0
1.2.3.4

would create a hash like this:

%ips = (

0.0.0.0 => 1,
1.2.3.4 => 2,
4.5.6.7 => 3,

);

What I really need this for is counting IP accesses in a log file. I'll parse the log file, and:

1. if the IP is not already in the hash, add a key/value pair of <IP>=>"1".

2. if the IP is already in the hash, increment the value.

(how is this done?)

-Mike K.
0
Comment
Question by:lunaboy
1 Comment
 
LVL 19

Accepted Solution

by:
Kim Ryan earned 200 total points
ID: 2657502
open(FH,"<ip_access.txt");
while (<FH>)
{
   chomp($_);
   $current_ip = $_;
   # increment occurence count, stored as value
   $ips{$current_ip}++;
}
close(FH);

foreach $ip (sort keys %ips)
{
   print("$ip was hit $ips{$ip} times\n");
}
0

Featured Post

Important Lessons on Recovering from Petya

In their most recent webinar, Skyport Systems explores ways to isolate and protect critical databases to keep the core of your company safe from harm.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I've just discovered very important differences between Windows an Unix formats in Perl,at least 5.xx.. MOST IMPORTANT: Use Unix file format while saving Your script. otherwise it will have ^M s or smth likely weird in the EOL, Then DO NOT use m…
There are many situations when we need to display the data in sorted order. For example: Student details by name or by rank or by total marks etc. If you are working on data driven based projects then you will use sorting techniques very frequently.…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
Six Sigma Control Plans
Suggested Courses

873 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question