Solved

3 column sum

Posted on 2014-03-28
4
168 Views
Last Modified: 2014-03-30
I have a log file that I would like to sum columns 2, 3, and 4 all together. I know this can be done using awk in a shell. I have to imagine that perl has a way to do this as as a fairly straight forward operation?

If the log file was:

X 1 1 1 blah
X 1 1 1 blah
X 1 1 1 blah

The result would just be "9", for instance.
0
Comment
Question by:stakor
  • 2
  • 2
4 Comments
 
LVL 35

Accepted Solution

by:
Robert Schutt earned 500 total points
ID: 39963354
Try this:
perl -lne "BEGIN { my $t = 0; } chomp; split ' '; $t += $_[1] + $_[2] + $_[3]; END { print $t; }" < test.log

Open in new window

0
 

Author Comment

by:stakor
ID: 39963374
It returned an error. I am running it on linux.

perl -lne "BEGIN { my $t = 0; } chomp; split ' '; $t += $_[1] + $_[2] + $_[3]; END { print $t; }" < ./test.log

syntax error at -e line 1, near "my  ="
BEGIN not safe after errors--compilation aborted at -e line 1.
0
 

Author Comment

by:stakor
ID: 39963548
Seems to work:

#!/usr/bin/perl

use strict;
use warnings;

open my $fh, '<', "test.log" or die $!;

my $count1 = 0;
my $count2 = 0;
my $count3 = 0;

while (<$fh>) {

    my ($j1, $c1, $c2, $c3, $j2) = split;

    $count1 += $c1;
    $count2 += $c2;
    $count3 += $c3;

}

my $total = $count1 + $count2 + $count3;
print "$total\n";

Open in new window

0
 
LVL 35

Expert Comment

by:Robert Schutt
ID: 39963589
ah, I run on windows. You can still use the one liner but swap the single and double quotes around.

The 'perl -nle' is like a shorthand for the loop and other stuff.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Perl script to parse log and delete the file 17 172
Validating the data using Oracle DBD module. 5 65
Perl 101 11 72
Transforming a Soap message to a simple xml message! 10 143
On Microsoft Windows, if  when you click or type the name of a .pl file, you get an error "is not recognized as an internal or external command, operable program or batch file", then this means you do not have the .pl file extension associated with …
A year or so back I was asked to have a play with MongoDB; within half an hour I had downloaded (http://www.mongodb.org/downloads),  installed and started the daemon, and had a console window open. After an hour or two of playing at the command …
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…
Edureka is one of the fastest growing and most effective online learning sites.  We are here to help you succeed.

911 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

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now