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Works for Thinkpad X1 Yoga 2G (20JDCTO1WW) (and most probably others) with OLED display

First install inotify-tools. Then create a script around inotify that will be launched upon each boot or through autostart.

sudo apt install inotify-tools
cat <<-EO1 | sudo tee /usr/local/bin/xbacklightmon.sh#!/bin/bash
    # https://wiki.archlinux.org/index.php/backlight#sysfs_modified_but_no_brightness_change
    # https://wiki.archlinux.org/index.php/Alienware_13#OLED_screen_brightness
    # https://gist.github.com/lalten/ce5ac0b1cc4b24a24cc44926255b871d

apt install inotify-tools

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.

Add the following line in `/etc/dnsmasq.conf`

dhcp-script=/etc/detect_new_device.sh

Setup sendmail to send email to your text number.

Reference:

https://wiki.openwrt.org/doc/howto/smtp.client

	#!/bin/bash

	set -e # Exit immediately if a command exits with a non-zero status.

	# --- Configuration ---
	# CSS rule to comment out (adjust if needed, mindful of regex special chars)
	TARGET_RULE_TEXT="background-color: inherit;"
	# Regex pattern for sed (basic version: handles spaces around colon)
	# Using \\| as delimiter to avoid escaping slashes in rule
	SED_PATTERN='background-color[[:space:]]:[[:space:]]inherit;'

	substitutions:
	device_name: switchbot-plug-1
	device_description: Energy Monitoring Smart Plug (W1901400)
	friendly_name: SwitchBot Plug Mini

	esphome:
	name: ${device_name}
	comment: ${device_description}
	platformio_options:
	board_build.flash_mode: dio

	#!/bin/ash
	set -euo pipefail

	cd $(dirname "$0")

	CF_API=https://api.cloudflareclient.com/v0i1909051800
	WG_IFACE=cfwarp

	regen=true
	if [ -e keys.cfg ]; then

	# Run the last command as root
	sudo !!
	# Serve current directory tree at http://$HOSTNAME:8000/
	python -m SimpleHTTPServer
	# Save a file you edited in vim without the needed permissions
	:w !sudo tee %
	# change to the previous working directory
	cd -
	# Runs previous command but replacing
	^foo^bar


	# ubuntu.daniguardiola.me - start

	# fix for yarn global path
	export PATH="$(yarn global bin):$PATH"

	# fix ~/.local/bin path
	export PATH="$HOME/.local/bin:$PATH"

	# put android sdk tools on path

	# syno-vpn-keepalive.sh
	# ---
	# Script to keep VPN alive on Synology DSM.
	# Checks if IP is pingable and if not:
	# disconnect VPN, reconnect VPN & add routes
	# ---
	# Modify vars:
	# - CHECKIP: IP to check to be pingable before reconnecting VPN
	# - NAME (Synology VPN name),
	# - ID (Synology VPN ID), SSH to NAS & run this to find ID