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To compress a folder

tar -zcvf tar-archive-name.tar.gz source-folder-name

To un-compress a tar.gz

tar -zxvf tar-archive-name.tar.gz

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class MyColor
  attr_accessor :red, :blue, :green, :alpha
  def initialize(args)
    @red = args[:red]
    @blue = args[:blue]
    @green = args[:green]
    @alpha = args[:alpha] || 1
  end
  def distance(color)   
    red_diff = self.red - color.red

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User.select(:first,:email).group(:first,:email).having("count(*) > 1").count

#{[nil, nil]=>512,
# ["Joe", "test@test.com"]=>23,
# ["Jim", "email2@gmail.com"]=>36,
# ["John", "email3@gmail.com"]=>21}

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http://kvz.io/blog/2013/01/16/vagrant-tip-keep-virtualbox-guest-additions-in-sync/

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http://stackoverflow.com/questions/22922891/vagrant-ssh-authentication-failure/23554973#23554973

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 du -chs *

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  \l - to list all the databases
  \connect <dbname> - connect to the db
  \dt - list all the tables in the current DB

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How to sync Local Folder with S3

s3cmd --configure
give the aws key and the secret key

options required
* --skip-existing
* --progress

So

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<link rel="import" href="../polymer/polymer.html">

<polymer-element name="my-element">

  <template>
    <style>    
      :host {
        position: absolute;
        width: 100%;
        height: 100%;

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#!/bin/bash

echo "*******************************************"
ps -aef | wc -l
echo "*******************************************"
sudo nmap -sS 127.0.0.1
echo "*******************************************"