vdw

CarrierWave.configure do |config|
  config.asset_host = proc do |file|
    'http://www.domain.com'
  end
end

vdw

i = 1000
i.toExponential();

// 1e+3

vdw

my_hash = {}

@objects.each { |obj| my_hash[obj.id] = obj }

my_array.collect{ |id| my_hash[id] }

vdw

Install tcpkill
yum -y install dsniff --enablerepo=epel

View connections
netstat -tnpa | grep ESTABLISHED.*sshd.

Block with ip tables
iptables -A INPUT -s IP-ADDRESS -j DROP

Kill connection

vdw

Convert a ruby hash to dotted path

def hash_to_dotted_path(hash, path = "")
  hash.each_with_object({}) do |(k, v), ret|
    key = path + k.to_s

    if v.is_a? Hash
      ret.merge! hash_to_dotted_path(v, key.to_s + ".")
 else

vdw

Convert a dotted path to hash

def dotted_path_to_hash(hash)
  hash.map do |pkey, pvalue|
    pkey.to_s.split(".").reverse.inject(pvalue) do |value, key|
      {key.to_sym => value}
    end
  end.inject(&:deep_merge)
end

vdw

Check for existing swap files

swapon -s

Create swap file with 1024k size

sudo dd if=/dev/zero of=/swapfile bs=1M count=1024

sudo mkswap /swapfile

vdw

Install MySQL server in Ubuntu

1) sudo apt-get install mysql-server

2) sudo apt-get install php5-mysql for php

3) sudo apt-get install libmysql-ruby for ruby

vdw

Basic CSS beautification rules

1) Order attributes alphabetically (not rules)

vdw

Install Sublime Text 2 on Ubuntu

Add repository

sudo add-apt-repository ppa:webupd8team/sublime-text-2

Update

sudo apt-get update