From: timr <timrandg@...>
Date: 2009-12-06T11:55:22+09:00
Subject: Re: awk to ruby 1.9

You can certainly recreate the awk functionality. But for the lazy
programmer who likes the tool that already exists try something like:

awk_test.txt
this	is 	some 	text	4
___________________________
>>search_term = "some"
>>data = 2
>>file = "awk_test.txt"

>> open("|awk -F '#{search_term}' '{print $#{data}}' #{file}"){|f| @results = f.gets}
=> " \ttext\t4\n"
>> puts @results
 	text	4


You can also use the IO class to create pipe to a unix command like
awk or agrep
in this example(code I have in my .irbrc file):

#you need to have TEV agrep installed to use this code
def agrep_with_string(regex, string)
  temp_file = 'temp_file_for_agrep'
  File.open(temp_file, 'w'){|f| f.puts string}
  str = "agrep --color -e '#{regex.source}' #{temp_file}"
  IO.popen(str){|io| @hits = io.readlines}
  File.delete(temp_file)
  @hits
end





On Dec 4, 12:09 pm, Panagiotis Atmatzidis <a...@convalesco.org> wrote:
> Hello,
>
> I'm a total newbe. I'm trying to figure out how to grab a specific Xth character from a .log and put it into an array.
>
> So far, I've got to this code snippet:
>
> ------------
> # encoding: utf-8
> class ReadIPs
>   def initialize
>     @read_ips = []
>   end
>
>   def get_ips(filename)
>     ips = [] # make a list of ip addressses
>     File.foreach(filename) do |line|
>        puts "#{line}" if line =~ /Ban/
>        end
>   end
> end
>
> ipadds = ReadIPs.new
> a = ipadds.get_ips("fail2ban.log")
> --------------
>
> The output though parses lines the following:
>
> 2009-11-19 00:31:29,928 fail2ban.actions: WARNING [ssh-ipfw] Ban 203.169.139.171
>
> Now, I'd like to isolate the IP and put it into an Array.
>
> I would like to use the output from the cli: "$ grep Ban fail2ban.log|awk -F "Ban" '{print $2}'"
>
>  60.12.200.xx
>  193.193.221.xx
>  85.72.xx.xx
>  124.207.xx.xx
>
> regards
>
> Panagiotis (atmosx) Atmatzidis
>
> email:  a...@convalesco.org
> URL:    http://www.convalesco.org
> GnuPG ID: 0xFC4E8BB4
> gpg --keyserver x-hkp://pgp.mit.edu --recv-keys 0xFC4E8BB4
> --
> The wise man said: "Never argue with an idiot. They bring you down to their level and beat you with experience."