subfuzion

Installing with apt-get

#!/bin/sh
# https://docs.docker.com/engine/installation/linux/ubuntu/#install-using-the-repository
sudo apt-get update && sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo apt-key fingerprint 0EBFCD88 | grep docker@docker.com || exit 1
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt-get update

garybernhardt

This document has moved!

It's now here, in The Programmer's Compendium. The content is the same as before, but being part of the compendium means that it's actively maintained.

peterc

require 'stringio'
require 'timeout'

class Object
  def methods_returning(expected, *args, &blk)
    old_stdout = $>
    $> = StringIO.new

    methods.select do |meth|
      Timeout::timeout(1) { dup.public_send(meth, *args, &blk) == expected rescue false } rescue false

amitsaha

How does ls work?

I wanted to be really able to explain to a fair amount of detail how does the program ls actually work right from the moment you type the command name and hit ENTER. What goes on in user space and and in kernel space? This is my attempt and what I have learned so far on Linux (Fedora 19, 3.x kernel).

How does the shell find the location of 'ls' ?

practicingruby

require 'socket'

module EventEmitter
  def _callbacks
    @_callbacks ||= Hash.new { |h, k| h[k] = [] }
  end

  def on(type, &blk)
    _callbacks[type] << blk
    self

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

drj42

Org-mode Org-mode Reference Card

Org mode reference card

Created from the plain text reference card on orgmode.org Download this file, and open it in Emacs org-mode!

dysinger

#!/bin/sh

# on ubuntu: need some utils & dev libs
sudo apt-get install apache2-utils openssl libssl-dev libpcre3-dev

# compile nginx
cd /tmp
curl http://nginx.org/download/nginx-0.7.64.tar.gz | tar xz
cd nginx*
./configure --with-http_ssl_module --with-http_dav_module \

tmm1

require 'rubygems'
require 'eventmachine'

module ChatClient
  def self.list
    @list ||= []
  end

  def post_init
    @name = "anonymous_#{rand(99999)}"