From: Bertram Scharpf <lists@...>
Date: 2009-12-08T00:33:22+09:00
Subject: Re: awk to ruby 1.9

Hi,

Am Samstag, 05. Dez 2009, 05:09:35 +0900 schrieb Panagiotis Atmatzidis:
> ------------
> 
>     File.foreach(filename) do |line|
>       puts "#{line}" if line =~ /Ban/
>     end
> 
> 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
> 
> I would like to use the output from the cli: "$ grep Ban fail2ban.log|awk -F "Ban" '{print $2}'"

The correct translation of `-F Ban "{print $2}"' would be

  ary = line.split /Ban/
  puts ary[ 2]

I would prefer something like

  if line =~ /Ban\s+/ then
    puts $'.split.first
  end

You can play around that for the rest of the day:

  ary = line.split
  while ary.any? do
    if ary.shift == "Ban" then
      puts ary.first
      break
    end
  end

I don't think it's worth here the effort of IP address parsing but
thats surely a matter of taste.

Bertram


-- 
Bertram Scharpf
Stuttgart, Deutschland/Germany
*
Discover String#notempty? at <http://raa.ruby-lang.org/project/step>.