Adonis Peralta isadon

XCP-ng USB passthrough tools

A set of command line tools and a service to make setting up passthrough USB devices easier:

add-custom-usb-policies - script to store and apply custom USB policies required for specific devices
attach-usb-devices - script and service to automatically connect USB devices to VMS when XCP-ng boots up
plug-usb - attach a physical USB device to a VM in one command
unplug-usb - remove a physical USB device from a VM in one command

To set up, copy the files onto your server and run install.sh to copy everything and set up the service.

Programming Media Keys on the Ducky One 2 Skyline

To use media keys on the Ducky One 2 Skyline, you must record a macro to bind the media function to a hotkey combination, i.e. Fn plus some key.

Example

Important: In the instructions below, "Press X+Y+Z" means press and hold key X, press and hold key Y, press and hold key Z in that order, and then release all three.

As an example, to bind Fn+PgUp to the play/pause media function:

Bash scripting cheatsheet

by Lee2sman
Updated 2017-09-18

Bash shebang

#!/usr/bin/env bash for portability, or less good, #!/bin/bash

Commenting

GPG and git on macOS

Setup

No need for homebrew or anything like that. Works with https://www.git-tower.com and the command line.

Install https://gpgtools.org -- I'd suggest to do a customized install and deselect GPGMail.
Create or import a key -- see below for https://keybase.io
Run gpg --list-secret-keys and look for sec, use the key ID for the next step
Configure git to use GPG -- replace the key with the one from gpg --list-secret-keys

Alternatives to the "Atlassian Stack"

Fuller stack alternatives (replaces at least two of the Atlassian stack)

Suppose we want to add support for a new iOS 8 API in our framework that replaces an older iOS 7 API. There are a few problems we might face:

The new API will crash if we call it on iOS 7
The new API won't compile if we build it using the iOS 7 SDK
The old API will raise a deprecation warning if built with a deployment target of iOS 8 and up

These three problems require three different technical solutions:

We can avoid calling the new API on an old OS version by using runtime detection (e.g. respondsToSelector:)
We can avoid compiling new APIs on old SDKs using the __IPHONE_OS_VERSION_MAX_ALLOWED macro

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!

\

	#!/bin/sh

	# make sure you have imagemagick installed: brew install imagemagick
	# your app_icons.sh file should have the correct permissions: run `chmod 775 app_icons.sh` in your terminal from where you put this file
	# put your `my_icon.png` next to this file and run ./app_icons.sh to export your app icons

	x=my_icon.png
	y=${x%.*}

	# delete the export directory so we start clean

	// Created by Vasily Ulianov on 09.02.17, updated in 2019.
	// License: MIT

	import Foundation

	/// Subclass of `Operation` that adds support of asynchronous operations.
	/// 1. Call `super.main()` when override `main` method.
	/// 2. When operation is finished or cancelled set `state = .finished` or `finish()`
	open class AsynchronousOperation: Operation {
	public override var isAsynchronous: Bool {

	// RationalNumber.swift
	//
	// A basic implementation of Rational numbers in Swift 3.0.
	// (c) 2016 Hooman Mehr. Licensed under Apache License v2.0 with Runtime Library Exception



	/// A data type to model rational numbers in Swift.
	///
	/// It always uses fully-reduced representation for simplicity and clarity of comparisons and uses LCM