ahpook

# for some reason facter takes the raw memorysize and reports it as
# a formatted string, which is useless for calculation
#

Facter.add("memorysize_raw") do
    confine :kernel => :linux
    setcode do
        size = 0
        File.readlines("/proc/meminfo").each do |l|
            size = $1.to_f if l =~ /^MemTotal:\s+(\d+)/

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

rgreenjr

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

doapp-ryanp

#@see rynop.com for details

sudo apt-get install xbindkeys

####now put the following in ~/.xbindkeysrc:
#KeyboardPlay
"dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.PlayPause"
  XF86AudioPlay

#KeyboardStop

leifg

file_to_disk = './tmp/large_disk.vdi'

Vagrant::Config.run do |config|
  config.vm.box = 'base'

  config.vm.customize ['createhd', '--filename', file_to_disk, '--size', 500 * 1024]
  config.vm.customize ['storageattach', :id, '--storagectl', 'SATA Controller', '--port', 1, '--device', 0, '--type', 'hdd', '--medium', file_to_disk]
end

octosteve

  int speakerPin = 9;
  int length = 70;
  String notes[] = {"G4","G4", "G4", "D#4/Eb4", "A#4/Bb4", "G4", "D#4/Eb4","A#4/Bb4", "G4", "D5", "D5", "D5", "D#5/Eb5", "A#4/Bb4", "F#4/Gb4", "D#4/Eb4","A#4/Bb4", "G4", "G5","G4","G4","G5","F#5/Gb5", "F5","E5","D#5/Eb5","E5", "rest", "G4", "rest","C#5/Db5","C5","B4","A#4/Bb4","A4","A#4/Bb4", "rest", "D#4/Eb4", "rest", "F#4/Gb4", "D#4/Eb4","A#4/Bb4", "G4" ,"D#4/Eb4","A#4/Bb4", "G4"}; 
  int beats[] = { 8, 8, 8, 6, 2, 8, 6 , 2 ,16 , 8, 8, 8, 6, 2, 8, 6, 2, 16,8,6,2,8,6,2,2, 2, 2,6,2,2,8,6,2,2,2,2,6,2,2,9,6,2,8,6,2,16  };
  int tempo = 50;
  
  void playTone(int tone, int duration) {
    for (long i = 0; i < duration * 1000L; i += tone * 2) {
      digitalWrite(speakerPin, HIGH);
      delayMicroseconds(tone);

EntropyWorks

#!/bin/bash
#
# Copyright 2014 Hewlett-Packard Development Company, L.P.
# All Rights Reserved.
# Authored by Yazz D. Atlas <[email protected]>
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#

mgreensmith

Solarized
#FDF6E3,#EEE8D5,#93A1A1,#FDF6E3,#EEE8D5,#657B83,#2AA198,#DC322F

Solarized Dark
#073642,#002B36,#B58900,#FDF6E3,#CB4B16,#FDF6E3,#2AA198,#DC322F

yvele

var Rx = require('rx');
var readline = require('readline');
var fs = require('fs');

var rl = readline.createInterface({
  input: fs.createReadStream('lines.txt')
});

var lines = Rx.Observable.fromEvent(rl, 'line')
  .takeUntil(Rx.Observable.fromEvent(rl, 'close'))

vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?