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Regular Expressions

Not only useful in programming, regular expressions can make complex tasks easy in many different scenarios. Here is a great site for testing your regex:

http://rubular.com

General Shell

Run the previous command again

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# Remove items used for building, since they aren't needed anymore
sudo apt-get clean
sudo apt-get -y remove linux-headers-$(uname -r) build-essential
sudo apt-get -y autoremove

# Zero out the free space to save space in the final image:
suod dd if=/dev/zero of=/EMPTY bs=1M
sudo rm -f /EMPTY
 
# Removing leftover leases and persistent rules

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Basic pre-requisites

• Some utilities:

sudo apt-get install vim tmux git

• Copy/paste from the command line:

sudo apt-get install xclip

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Installing git on CentOS 5 using yum

Since you're using CentOS 5, the default package manager is yum, not apt-get. To install a program using it, you'd normally use the following command:

$ sudo yum install <packagename>

However, when trying to install git this way, you'll encounter the following error on CentOS 5:

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Running Puma on Nginx

I use the latest Puma v1.4.0 from rubygems.

Make sure you have nginx installed with these options:

>/opt/nginx/sbin/nginx -V
nginx version: nginx/1.0.15

built by gcc 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)

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.fluid-row {
  div, section, article, li { /* Needs testing on li's */
    &:first-child { /* using first child and margin-left for IE support */
      margin-left: 0;
    }
  }
}

.fluid-column(@columns: 1, @offset: 0, @reset: default) {
  .input-block-level();

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set :stage, 'production'
set :shared_children, shared_children << 'tmp/sockets'

puma_sock    = "unix://#{shared_path}/sockets/puma.sock"
puma_control = "unix://#{shared_path}/sockets/pumactl.sock"
puma_state   = "#{shared_path}/sockets/puma.state"
puma_log     = "#{shared_path}/log/puma-#{stage}.log"

namespace :deploy do
  desc "Start the application"

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#!/usr/bin/env bash

# Simple move this file into your Rails `script` folder. Also make sure you `chmod +x puma.sh`.
# Please modify the CONSTANT variables to fit your configurations.

# The script will start with config set by $PUMA_CONFIG_FILE by default

PUMA_CONFIG_FILE=config/puma.rb
PUMA_PID_FILE=tmp/pids/puma.pid
PUMA_SOCKET=tmp/sockets/puma.sock

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Magento Snippets

Add Attribute Group and Attributes to Attribute Sets

In an install script, you can follow the below example:

<?php
/**
 * Pan_JewelryDesigner Extension

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Deploy Rails app to digitalocean with nginx, unicorn, capistrano & postgres

Create droplet of your liking (ubuntu 12.10 x32)

ssh to root in terminal with your server ip

ssh root@123.123.123.123

Add ssh fingerprint and enter password provided in email