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Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

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General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

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In Terminal

mkdir ~/.bash

Copy the raw git-prompt.sh file from git contrib in to the ~/.bash directory: https://github.com/git/git/blob/master/contrib/completion/git-prompt.sh

Inside ~/.bashrc or ~/.bash_profile (choose the file where you normally put any bash customizations/setup), add the lines:

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How to setup Git for Windows

I know this document seems long, but it shouldn't be too difficult to follow. This guide is based on Windows, but every program here has Linux/Mac equivalents, and in most cases they're built-in. So, take a deep breath and go step by step.

The steps below are for GitHub, but the steps are almost idential for Bitbucket, Heroku, etc.

You'll probably want to make sure Chocolatey is installed, since it streamlines installing this stuff later. If you install via Chocolatey, you don't need to run the installers from the products' respective sites.

Cmder / ConEmu

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Each YouTube video has 4 generated images. They are predictably formatted as follows:

http://img.youtube.com/vi/<insert-youtube-video-id-here>/0.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/1.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/2.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/3.jpg

The first one in the list is a full size image and others are thumbnail images. The default thumbnail image (ie. one of 1.jpg, 2.jpg, 3.jpg) is:

http://img.youtube.com/vi/<insert-youtube-video-id-here>/default.jpg

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CONTENT
Expressions, Statements and Controlstructures
  Equlaity
  Assigments
    The ||= idiom
    Other assignments
  Flip-flops
  Iterators
  Blocks
  Control-flow keywords

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#!/usr/bin/env ruby
# Author : Emad Elsaid (https://github.com/blazeeboy)
# **Usage** : 
# 
# * `ruby readability.rb <accesstoken>`
# this will get a long term access token from the short term one
# you can create a facebook app and get access token from here
# * `ruby readability.rb`
# will start the script
require 'open-uri'

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MySQL

Getting started: http://www.sqlteaching.com/

Related tutorial: http://cd64.de/mysql-cli

SQL joins infografic: http://cd64.de/sql-joins

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Sublime Text 2 – Useful Shortcuts (PC)

Loosely ordered with the commands I use most towards the top. Sublime also offer full documentation.

Editing

Ctrl+C	copy current line (if no selection)
Ctrl+X	cut current line (if no selection)
Ctrl+⇧+K	delete line
Ctrl+↩	insert line after

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import java.util.Scanner;
public class ipreader {
public static void main(String[] args) {
	Scanner s = new Scanner(System.in);	
	System.out.println("enter your ip");
	String ip=s.next();
	String newip="";
	char ipChar;
	
	for(int i=0;i<ip.length();i++)