Michael Ramsey meramsey

One-line Tree in Python

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

def tree(): return defaultdict(tree)

That's it!

⚠️ Content below I now consider obsolete. My latest guide is now located here: Technical guide for using YubiKey series 4 for GPG and SSH. Please consult that resource instead.

Quick GPG Smartcard Guide

YubiKey 4 series GPG and SSH setup guide

Written for fairly adept technical users, preferably of Debian GNU/Linux, not for absolute beginners.

You'll probably be working with a single smartcard, so you'll want only one primary key (1. Sign & Certify) and two associated subkeys (2. Encrypt, 3. Authenticate). I've published a Bash function which automates this slightly special key generation process.

Demo:

Spoiler warning

Spoiler text. Note that it's important to have a space after the summary tag. You should be able to write any markdown you want inside the <details> tag... just make sure you close <details> afterward.

console.log("I'm a code block!");

	#!/usr/bin/env python2
	"""A very simple Apache access log parser in Python

	usage help = http://i.imgur.com/XBiX2kX.png

	when required arguments are missing = http://i.imgur.com/P5L0GZV.png

	when incorrect file path is passed = http://i.imgur.com/sJDc0om.png

	successful sample output = http://i.imgur.com/iH89mwI.png

	#!/usr/bin/env python3
	"""
	Generate a random IPv6 address for a specified subnet
	"""

	from random import seed, getrandbits
	from ipaddress import IPv6Network, IPv6Address

	subnet = '2001:db8:100::/64'

	###
	# Proxmox or other server kernel params cheap tune and secure.
	# Try it if you have heavy load on server - network or memory / disk.
	# No harm assumed but keep your eyes open.
	#
	# @updated: 2020-02-06 - more params used, adjust some params values, more comments on params
	#

	### NETWORK ###

	# Generate a new pgp key: (better to use gpg2 instead of gpg in all below commands)
	gpg --gen-key
	# maybe you need some random work in your OS to generate a key. so run this command: `find ./* /home/username -type d \| xargs grep some_random_string > /dev/null`

	# check current keys:
	gpg --list-secret-keys --keyid-format LONG

	# See your gpg public key:
	gpg --armor --export YOUR_KEY_ID
	# YOUR_KEY_ID is the hash in front of `sec` in previous command. (for example sec 4096R/234FAA343232333 => key id is: 234FAA343232333)

	#!/bin/bash

	# Quick script to disable an internal webcam if an external one is attached, or
	# enable the internal one if the external one's not attached.

	# by Shimon Rura, 25 Jan 2018. In the public domain.

	# To use, run `lsusb` and identify the lines for your internal and external camera devices.
	# For example, mine are:
	# internal:


	lsusb -v 2> /dev/null \| grep -e "Apple Inc" -A 2