Robin Chen RobinCPC

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Reverse Port Tunneling with EC2

Reverse port tunneling is used to give a user outside of a networks firewall accesst to a computer inside the firewall where direct SSH connections aren't allowed. It works by the in-firewall computer SSH'ing to a middleman computer that then forwards incomming SSH connections on a given port to the firewalled computer.

Setup the middleman

Get an ubuntu EC2 instance
Download it's security keys (both in-firewall and out-firewall computers will need the private key)
Setup the security group to allow connections on port 10002
SSH into the middleman and add: GatewayPorts yes to /etc/ssh/sshd_config

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!

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Upgrading to Lion or Yosemite and WebStorm 9, I noticed key repeat was
turned off for the IdeaVim plugin h j k l keys.

System-wide key repeat

defaults write -g ApplePressAndHoldEnabled -bool false in a terminal will enable
key repeat for every app. This can alternatively be found in the accessibility settings in OS X' preferences.

App specific key repeat

ZeroMQ vs Redis

This document is research for the selection of a communication platform for robot-net.

Goal

The purpose of this component is to enable rapid, reliable, and elegant communication between the various nodes of the network, including controllers, sensors, and actuators (robot drivers). It will act as the core of robot-net to create a standardized infrastructure for robot control.

Requirements:

OpenGL Development on OS X

While it's possible to download packages and install them manually, it's such a hassle. Fortunately for us, OS X has an unofficial package manager called http://brew.sh Let's install it. Open you Terminal and paste the following code:

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Great. Homebrew will automatically install packages to /usr/local. Conveniently, that directory is already in your include and link paths.

Git 更換遠端伺服器倉庫網址URL

1.確認目前Git遠端伺服器網址： git remote -v

git remote -v
origin  https://github.com/USERNAME/REPOSITORY.git (fetch)
origin  https://github.com/USERNAME/REPOSITORY.git (push)

2.更換Git遠端伺服器位網址，使用：git remote set-url

These instructions will explain how to install tensorflow on mac with cuda enabled GPU suport. I assume you know what tensorflow is and why you would want to have a deep learning framework running on your computer.

Prerequisites

Make sure to update your homebrew formulas

brew update

	#include <stdio.h>
	#include <stdlib.h>

	#include "ros/ros.h"

	#include "std_msgs/MultiArrayLayout.h"
	#include "std_msgs/MultiArrayDimension.h"

	#include "std_msgs/Int32MultiArray.h"

	"""
	Use a Counter to find the most common words in "The Wonderful Wizard of Oz" by
	L. Frank Baum.

	Available in (mostly) plain text at:
	https://archive.org/stream/wonderfulwizardo00baumiala/wonderfulwizardo00baumiala_djvu.txt

	Note: This code also counts the words in the header, so it's not a realistic
	applicaton, but more of a demonstration of python's Counter.