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Parse text file, look for string, remove other lines, replace string with known names

Posted on 2008-10-14
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Last Modified: 2013-11-18
I am trying to see what the best way to do this. Either perl, batch, cscript or some other command line means.
I need to parse a multi-line text file which contains data like:
---------------------------------------------------------------------------------
Variable = .iso.org.dod.internet.private.enterprises.9.9.392.1.3.21.1.10.10.83.72.65.82.75.45.66.71.65.78.4151
Value    = String 123.123.123.248

Variable = .iso.org.dod.internet.private.enterprises.9.9.392.1.3.21.1.10.10.83.72.65.82.75.45.66.71.65.78.4154
Value    = String 123.123.123.240

End of MIB subtree.
---------------------------------------------------------------------------------

Then I need to only show the results that start with 123.123 so it looks like:
123.123.123.248
123.123.123.240
---------------------------------------------------------------------------------

I then would like to compare it to another source, either a flat file or even a SQL source that would contain a common name for that number and replace the number with the text.

Example:
123.123.123.248 would become                   Host248
123.123.123.240 would become                   Host240
---------------------------------------------------------------------------------
Results file would contain
Host248
Host240
---------------------------------------------------------------------------------
The results find/replace could be up to over 100 so doind a command line replace would be complex.

Thoughts and ideas welcomed.
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Question by:edrz01
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11 Comments
 
LVL 39

Expert Comment

by:Adam314
ID: 22715232

##I then would like to compare it to another source,
##either a flat file or even a SQL source
##If you load this into %cn
 
while(<>) {
    next unless /^Value\s*=\s*String\s*(.*)/;
    print "$cn{$1}\n";
}

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LVL 9

Expert Comment

by:gregcmcse
ID: 22715242
This could be done easily in either Perl or VBScript.  Is Perl your preference?
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LVL 9

Expert Comment

by:gregcmcse
ID: 22715723
This should be pretty much what you need:
my %ip_names;
 
open (IN,"myIPtoNAMEfile.txt");
 
	# Following assumes IP address to friendly names file is a CSV 
	# in this format:  123.123.123.240,Host240  [each host on its own line]
while (<IN>) {
	chomp;
	my ( $ip, $friendlyname ) = split(/,/);
	$ip_names{$ip} = $friendlyname;
}
close(IN);
 
open(OUT, "> myoutputfile.txt");
 
open (IN,"mylogfile.txt");
	#Value    = String 123.123.123.240
while (<IN>) {
	chomp;
	if ( /^Value\s*=\s*String\s*(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})/ ) {
		print OUT $ip_names{$1} . "\n";
	}
}
close(IN);
 
close(OUT);

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Expert Comment

by:gregcmcse
ID: 22715758
Note, I'd prefer to make sure we're seeing an IP address by validating that we're seeing 1-3 digits, a period, 1-3 digits, a period, 1-3 digits, a period, and 1-3 digits.  I'm assuming there could be other "Value = String" lines in the file.  It gets a little more complicated if there might be other IP addresses in the file that you don't wish to look up that are in the same format:
      Value    = String 123.123.123.240

If there are, let me know and we'll take a different approach.
0
 

Author Comment

by:edrz01
ID: 22721222
Gregcmcse,

I appreciate your help on this. I took your code snippet and created a file called myiptoname.txt file and put my IP's and hostnames seperated by a comma. When I ran the perl script it created a blank myoutputfile.txt - no data.

Also, what if I do have some IP's that have a 1 or 2 digit value for the last octet?
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LVL 39

Expert Comment

by:Adam314
ID: 22723097
Did you have your data in mylogfile.txt, formatted as in your original post?

Post your log file and ip to name file here.
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Author Comment

by:edrz01
ID: 22723172
My source file is called VPNOUT.TXT and looks like this (minus the ------'s):
-----------------------
Variable = .iso.org.dod.internet.private.enterprises.9.9.392.1.3.21.1.10.10.83.72.65.82.75.45.66.71.65.78.4227
123.123.123.248

Variable = .iso.org.dod.internet.private.enterprises.9.9.392.1.3.21.1.10.10.83.72.65.82.75.45.66.71.65.78.4289
123.123.123..240

End of MIB subtree.
--------------------------------------
My myIPtoNAMEfile.txt looks like:
--------------------------------------
123.123.123.240,3P8-5019
123.123.123.248,3P8-5020
123.123.123.88,3S2-5034
123.123.123.96,3S2-5035
--------------------------------------

My (your code) looks like:
my %ip_names;
open (IN,"myIPtoNAMEfile.txt");
      # Following assumes IP address to friendly names file is a CSV
      # in this format:  123.123.123.240,Host240  [each host on its own line]
while (<IN>) {
      chomp;
      my ( $ip, $friendlyname ) = split(/,/);
      $ip_names{$ip} = $friendlyname;
}
close(IN);
open(OUT, "> myoutputfile.txt");
open (IN,"VPNOUT.txt");
      #Value    = String 123.123.123.240
while (<IN>) {
      chomp;
            print  $ip_names{$1};
      if ( /^Value\s*=\s*String\s*(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})/ ) {
            print OUT $ip_names{$1} . "\n";
      }
}
close(IN);
close(OUT);
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LVL 39

Accepted Solution

by:
Adam314 earned 500 total points
ID: 22724182
This version also handles it correctly when there is no name for a given IP - it prints "<the_ip> - no name" (where <the_ip> is the ip address).

#!/usr/bin/perl
use strict;
use warnings;
 
my %ip_names;
open (my $in,"<myIPtoNAMEfile.txt") or die "ip2name: $!\n";
while (<$in>) {
	chomp;
	my @f=split/,/;
	next unless $#f>=1;
	$ip_names{$f[0]} = $f[1];
}
close($in);
 
 
open(my $out, ">output.txt") or die "output: $!\n";
open ($in,"VPNOUT.TXT");
while(<$in>) {
	chomp;
	next unless /(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})/;
	if(exists($ip_names{$1})) {print "$ip_names{$1}\n";}
	else {print "$1 - no name\n";}
}
close($in);
close($out);

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Author Closing Comment

by:edrz01
ID: 31506033
Perfect! Thank you so much!
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Author Comment

by:edrz01
ID: 22740818
Adam...
I just realized that this was not updating the external file. When I try to add the print Out code it bombs.
How would I get the output to a file?
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LVL 39

Expert Comment

by:Adam314
ID: 22741266
       if(exists($ip_names{$1})) {print $out "$ip_names{$1}\n";}
        else {print $out "$1 - no name\n";}
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