Kobi Cohen-Arazi kobi-ca

Digital Toolchain for Book Authors

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!

(C-x means ctrl+x, M-x means alt+x)

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

start new:

tmux

start new with session name:

tmux new -s myname

	#!/bin/bash

	# Script to convert PDF file to JPG images
	#
	# Dependencies:
	# * pdftk
	# * imagemagick

	PDF=$1

	#!/usr/bin/env python2

	"""
	Other Repositories of python-ping
	~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	* https://github.com/l4m3rx/python-ping supports Python2 and Python3
	* https://bitbucket.org/delroth/python-ping

	/*
	* An example using splice syscall which avoids copying to/from user space buffers to kernel space
	* and uses the pipe buffers allocated in kernel space as an intermediate to directly xfer from one file to another
	*
	* gcc -o splice splice.c -g
	*/

	#define _GNU_SOURCE
	#include <stdio.h>
	#include <string.h>

	#include <iostream>

	// This is a rewrite and analysis of the technique in this article:
	// http://bloglitb.blogspot.com/2010/07/access-to-private-members-thats-easy.html

	// ------- Framework -------
	// The little library required to work this magic

	// Generate a static data member of type Tag::type in which to store
	// the address of a private member. It is crucial that Tag does not

	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

	Primary use case: workaround non-working "ip link set wlan0 netns ..." for some network drivers.

	Secondary use case: simple demo for getting/setting the MAC address, tun/tap, raw sockets...

	Pre-built version: http://vi-server.org/pub/tap_copy