Jason Chalom TRex22

Raspberry Pi Zero OTG Mode

Simple guide for setting up OTG modes on the Raspberry Pi Zero - By Andrew Mulholland (gbaman).

The Raspberry Pi Zero (and model A and A+) support USB On The Go, given the processor is connected directly to the USB port, unlike on the B, B+ or Pi 2 B, which goes via a USB hub.
Because of this, if setup to, the Pi can act as a USB slave instead, providing virtual serial (a terminal), virtual ethernet, virtual mass storage device (pendrive) or even other virtual devices like HID, MIDI, or act as a virtual webcam!
It is important to note that, although the model A and A+ can support being a USB slave, they are missing the ID pin (is tied to ground internally) so are unable to dynamically switch between USB master/slave mode. As such, they default to USB master mode. There is no easy way to change this right now.
It is also important to note, that a USB to UART serial adapter is not needed for any of these guides, as may be documented elsewhere across the int

Installing gcc 4.8 and Linuxbrew on CentOS 6

The GCC distributed with CentOS 6 is 4.4.7, which is pretty outdated. I'd like to use gcc 4.8+. Also, when trying to install Linuxbrew you run into a dependency loop where Homebrew's gcc depends on zlib, which depends on gcc. Here's how I solved the problem.

Note: Requires sudo privileges.

Resources:

http://superuser.com/a/676337/88393: Forum response on using CERN's open Scientific Linux distribution of RHEL's developer toolset.
http://linux.web.cern.ch/linux/devtoolset/: CERN's developer toolset installation instructions.

Add Git Branch Name to Terminal Prompt (Linux/Mac)

Open ~/.bash_profile in your favorite editor and add the following content to the bottom.

# Git branch in prompt.

parse_git_branch() {

Run rails new --help to view all of the options you can pass to rails new:

$ bin/rails new --help
Usage:
  rails new APP_PATH [options]

Options:
  -r, [--ruby=PATH]                                      # Path to the Ruby binary of your choice
                                                         # Default: /Users/eliot/.rbenv/versions/2.2.0/bin/ruby

	print("UPDATE AUG 2023: this script is beyond old and broken")
	print("You may find interesting and more up to date resources in the comments of the gist")
	exit()

	from slacker import Slacker
	import json
	import argparse
	import os

	# This script finds all channels, private channels and direct messages

	function mySexyMethod() {
	return new Promise(function (resolve, reject) {
	someAsync.method(params, function (err, data) {
	if (err) {
	return reject(err);
	}

	resolve(data);
	})
	});

	// Run this in the F12 javascript console in chrome
	// if a redirect happens, the page will pause
	// this helps because chrome's network tab's
	// "preserve log" seems to technically preserve the log
	// but you can't actually LOOK at it...
	// also the "replay xhr" feature does not work after reload
	// even if you "preserve log".

	window.addEventListener("beforeunload", function() { debugger; }, false)

	# Source
	# http://www.iconoclastlabs.com/blog/ruby-on-rails-on-the-raspberry-pi-b-with-rbenv

	git clone https://github.com/sstephenson/rbenv.git ~/.rbenv
	echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
	echo 'eval "$(rbenv init -)"' >> ~/.bashrc
	git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build

	sudo apt-get install autoconf bison build-essential libssl-dev libyaml-dev libreadline6 libreadline6-dev zlib1g zlib1g-dev
	sudo apt-get install -y openssl libreadline6-dev git-core zlib1g libssl-dev

	For quick reference if you're not in your usual environment, add to Preferences -> Key Bindings-User:

	[
	{ "keys": ["alt+super+p"], "command": "insert", "args": {"characters": "binding.pry"} }
	]

	$ wget http://people.centos.org/tru/devtools-2/devtools-2.repo -O /etc/yum.repos.d/devtools-2.repo
	$ yum install devtoolset-2-gcc devtoolset-2-binutils
	$ yum install devtoolset-2-gcc-c++ devtoolset-2-gcc-gfortran