ntlk

# Input rgb values 1...255
# based on http://forums.devshed.com/c-programming-42/rgb-to-hsv-conversion-rountine-162526.html

r = r / 255.0
g = g / 255.0
b = b / 255.0
max = [r, g, b].max
min = [r, g, b].min
delta = max - min
v = max * 100

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

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

stingh711

#!/bin/bash
#attach the EBS to /dev/sdf before running it

#format EBS
mkfs -t ext4 /dev/xvdf

#copy original /var to /dev/xvdf
mkdir /mnt/new
mount /dev/xvdf /mnt/new
cd /var

gpfeiffer

#############################################################################
##
##  extended_gcd.rb
##
##  given non-negative integers a > b, compute
##  coefficients s, t such that gcd(a, b) == s*a + t*b 
##
def extended_gcd(a, b)

  # trivial case first: gcd(a, 0) == 1*a + 0*0  

grindars

#!/bin/bash
#
# Steam installer for Debian wheezy (32- and 64-bit)
#
# Place into empty directory and run.
#

download() {
    local url="$1"
    local filename="$(basename "$url")"

willurd

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

wsargent

303 See Other

Location: https://github.com/wsargent/docker-cheat-sheet

Hi there!

The docker cheat sheet has moved to a Github project under https://github.com/wsargent/docker-cheat-sheet.

Please click on the link above to go to the cheat sheet.

andris9

Setup reverse tunnel

Run the following in your client machine

ssh -R EXPOSED_PORT:localhost:SERVICE_PORT USER@HOST

Where

• EXPOSED_PORT is the port exposed to the internet in the proxy server
• SERVICE_PORT is the port your application is listening in your machine

rstacruz

#!/usr/bin/env ruby
#
# Syncs Ruby binstubs for ruby-communal-gems.
# Run this everytime you install a new Ruby, or when you install a new gem
# with a bin/ command. (ie, when you typically do rbenv rehash)
#
# See: https://github.com/tpope/rbenv-communal-gems/issues/5
#
require 'fileutils'