naholyr

Sample service script for debianoids

Look at LSB init scripts for more information.

Usage

Copy to /etc/init.d:

# replace "$YOUR_SERVICE_NAME" with your service's name (whenever it's not enough obvious)

rbarazi

find .-name .DS_Store -print0 | xargs -0 git-rm --ignore-unmatch

KINGSABRI

#!/usr/bin/env ruby
# Full Contol on Ethnet, IP & TCP headers. Play with it ;)
# to test it: nc -lvp 4444
# as root: tcpdump  -nvvvv 'tcp port 4444' -i wlan0  # change wlan0 to your interface
# or use packetfu to monitor as tcpdump
## cap = PacketFu::Capture.new(:iface => 'wlan0' , :promisc=> true)
## cap.show_live(:filter => 'tcp and port 4444')
# libpcap should be installed
# gem install pcaprub packetfu

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

szimek

HTTP caching

Kinds of caches

• Browser
• Proxy
• Gateway

TODO Difference between proxy and gateway caches.

rstacruz

Rails Models

Generating models

$ rails g model User

Associations

belongs_to

has_one

pachacamac

require 'rest_client'
require 'json'
a = `sox -d --norm -t .flac - silence -l 1 0 1% 1 6.0 1% rate 16k`
#a = `arecord -q -d 3 -c 1 -f S16_LE -r 22050 -t wav | flac - -f --totally-silent -o-`
r = RestClient.post 'https://www.google.com/speech-api/v1/recognize?lang=en-US', a,
                    :content_type => 'audio/x-flac; rate=16000'
if j = JSON.parse(r)
  (p j; `espeak 'you said: #{j['hypotheses'].first['utterance']}'`)
end

TeWu

TCP client and multithreaded server in 14 lines of Ruby code

Server:

require "socket"
server = TCPServer.open(2626)
loop do
	Thread.fork(server.accept) do |client| 
 client.puts("Hello, I'm Ruby TCP server", "I'm disconnecting, bye :*")

chriseppstein

Sass/Less Comparison

In this document I am using Sass's SCSS syntax. You can choose to use the indented syntax in sass, if you prefer it, it has no functional differences from the SCSS syntax.

For Less, I'm using the JavaScript version because this is what they suggest on the website. The ruby version may be different.

Variables