Working with Files in Ruby

http://www.techotopia.com/index.php/Working_with_Files_in_Ruby

Read input from console in Ruby

puts "Enter A"
a = gets.chomp
puts "Enter B"
b = gets.chomp
c = Integer(a) + Integer(b)
puts c

you can also pass the parameters through the command line. Command line arguments are stores in the array ARGV. so ARGV[0] is the first number and ARGV[1] the second number
#!/usr/bin/ruby

first_number = ARGV[0].to_i
second_number = ARGV[1].to_i

puts first_number + second_number
and you call it like this
% ./plus.rb 5 6
==> 11

Setting up Resque

http://atevans.com/setting-up-resque

Http delete with authentication ruby

require 'rubygems'
require "net/http"

Net::HTTP.start('www.example.com') {|http|                  
            req = Net::HTTP::Delete.new("/api/products/#{product_id}")            
            req.basic_auth '#{user_name}', '#{password}'        
            response = http.request(req)
}

Install sendmail

I used:

Code:

sudo apt-get install sendmail

It installed sendmail and by this command I could test it:

Code:

sudo ps aux | grep sendmail

Result:

Quote:

sudo ps aux | grep sendmail root 10366 0.0 0.7 8216 2020 ? Ss 09:50 0:00 sendmail: MTA: accepting connections 1000 10376 0.0 0.3 2880 796 pts/0 S+ 09:56 0:00 grep sendmail

How to “flush tor circuit”

tor already switches the route roughly every 10 minutes. Sometimes you may need to get new tor ip or new route programatically. Here is how to do it in ruby.


What we are doing is "Send a SIGHUP to Tor. According to its man page this should make Tor fetch a new directory".
We can send a SIGHUP to tor get new route, thus a new tor ip.



require 'rubygems'
require 'sys/proctable' 
include Sys

  Sys::ProcTable.ps.each { |ps|

    if ps.name.downcase == "tor"      

      Process.kill('SIGHUP', ps.pid)

    end

  }

you can schedule this script to run periodically, say every 1 minutes. Then you will be getting new tor ip every minutes.


https://svn.torproject.org/svn/incognito/trunk/root_overlay/etc/NetworkManager/dispatcher.d/50-tor-sighup.sh

Kill process by his name ruby

require 'rubygems'
require 'sys/proctable'
include Sys



Sys::ProcTable.ps.each { |ps|
    if ps.name.downcase == "process name"    
      Process.kill('KILL', ps.pid)
    end
  }

#Run script as root user