CODEWITHSUNDEEP
ruby
jbod
jbod

Reputation: 13

Search for all instances of 'IP len =' from Data packet capture file

I have a txt file that I've used to capture data packets over my network. I'm wondering if anyone would be able to tell me how I can use regular expressions to search for all instances of 'IP len =' in the file, and extract them into another file perhaps?

Upvotes: 1

Views: 76

Answers (2)

Mike Lewis
Mike Lewis

Reputation: 64167

This should do the trick:

File.open("log.txt", 'r') do |f|
  File.open("ip_len_out.txt", 'w') do |out|
    f.lines.each do |line|
      out.puts $1 if line.match(/IP\s+len\s*=(\d+)/)
    end
  end
end

ip_len_out.txt now contains all the ip lengths, new line delimited.

Upvotes: 0

odrm
odrm

Reputation: 5259

This little script will do the trick (amend as you like):

#!/usr/bin/ruby -w

File.open('infile.txt', 'r') do |infile|
    File.open('outfile.txt', 'w') do |outfile|
        while (line = infile.gets) do
            if line =~ /IP\s+len\s+=/ then
                outfile.puts line
            end
        end
    end
end

Upvotes: 2

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