sergekukharev

Latency Comparison Numbers (~2012)

Name
L1 cache reference	0.5	ns
Branch mispredict	5	ns
L2 cachereference	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

egoarka

echo "33:34" | awk -F':' '{ print $1, $2 }' | read a b <<<  (cat)
read c d <<< $(echo "21:22" | awk -F':' '{ print $1, $2 }')

fnky

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

• Ctrl-Key: ^[
• Octal: \033
• Unicode: \u001b
• Hexadecimal: \x1B
• Decimal: 27

mykubicle

#!/bin/bash

# Uninstall old version
sudo apt-get remove docker docker-engine docker.io
# Update apt package index
sudo apt-get update
# Install packages to allow apt to use a repo over HTTPS
sudo apt-get install apt-transport-https ca-certificates curl software-properties-common
# Add Docker offical GPG Key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

steven2358

FFmpeg cheat sheet

A list of useful commands for the FFmpeg command line tool.

Download FFmpeg: https://www.ffmpeg.org/download.html

Full documentation: https://www.ffmpeg.org/ffmpeg.html

Basic conversion

rizo

# Protobuf Builder
# ================
#
# This image builds protocol buffers library from source with Go generation
# support. The builder and runner images are produced.

# Builder Image
# -------------

FROM golang:1.8.3-alpine3.6 as builder

marcgeld

# Generate a random Alphanumeric string

Function Get-RandomAlphanumericString {
	
	[CmdletBinding()]
	Param (
        [int] $length = 8
	)

	Begin{

ckandoth

# Create a folder where you want to install different Pythons, and cd into it:
# Note that it doesn't need to be your home folder. Put it wherever you want to maintain such software:
export PYTHON_BASE="$HOME/python"
mkdir -p $PYTHON_BASE
cd $PYTHON_BASE

# Download source tarball into a subfolder named src, and untar:
curl --create-dirs -L -o src/Python-2.7.10.tgz https://www.python.org/ftp/python/2.7.10/Python-2.7.10.tgz
cd src
tar -zxf Python-2.7.10.tgz

akkida746

public class WsFilter implements Filter {

	private ApplicationContextProvider springContext;
	private FilterConfig filterConfig;
	private MessageFactory msgFactory = null;
	private static final Logger logger_ = Logger.getLogger(WsFilter.class.getName());
	private static final Logger soap_logger = Logger.getLogger("soapLogger");
	
	@Autowired
	private WsFilterHelper helper;

rvl

Pushing to Multiple Git Repos

If a project has to have multiple git repos (e.g. Bitbucket and Github) then it's better that they remain in sync.

Usually this would involve pushing each branch to each repo in turn, but actually Git allows pushing to multiple repos in one go.

If in doubt about what git is doing when you run these commands, just