gregjhogan

# 16 TB drive with ext4 file system optimized for max available space:
# --------------------------------------------------------------------
$ sudo mkfs.ext4 -m 0 -T largefile4 /dev/sdX
/dev/sdX: 8 bytes were erased at offset 0x00000200 (gpt): 45 46 49 20 50 41 52 54
/dev/sdX: 8 bytes were erased at offset 0xe8d7dfffe00 (gpt): 45 46 49 20 50 41 52 54
/dev/sdX: 2 bytes were erased at offset 0x000001fe (PMBR): 55 aa
/dev/sdX: calling ioctl to re-read partition table: Success
mke2fs 1.45.5 (07-Jan-2020)
Creating filesystem with 3906461696 4k blocks and 3814912 inodes
Filesystem UUID: 3ea950c5-ae13-4755-a6b8-6f317f6f8dea

gregjhogan

#!/bin/sh -e
if [[ $EUID -ne 0 ]]; then
  echo "This script must be run as root" 
  exit 1
fi

grep "^HostKey" /etc/ssh/sshd_config | while read -r HOST_KEY; do
  KEY_FILE=$(echo "$HOST_KEY" | cut -d' ' -f2)
  KEY_DIR=$(dirname "$KEY_FILE")
  KEY_TYPE=$(echo "$KEY_FILE" | cut -d'_' -f3)

gregjhogan

# run this every time you open spotify (after it has launched and says it is offline)
# it probably notices network manager is stopped for a second which disables the check
sudo systemctl restart network-manager.service

# turning off network manager makes it immediately show online when it starts up
sudo systemctl stop network-manager.service
sudo systemctl disable network-manager.service

gregjhogan

SERVER=<your-server>
DOMAIN=<your-domain>
ssh-keygen -R ${SERVER}
ssh-keygen -R ${SERVER}.${DOMAIN}
ssh-keygen -R $(dig +short ${SERVER}.${DOMAIN})

gregjhogan

# list of hostnames from file
ssh-keyscan -H -f /<path>/<to>/<file> >> ~/.ssh/known_hosts

gregjhogan

# requires docker-cli 19.03 or higher
docker run --privileged linuxkit/binfmt:v0.7
export DOCKER_CLI_EXPERIMENTAL=enabled
docker buildx use arm64builder || docker buildx create --name arm64builder --use
docker buildx inspect --bootstrap
docker buildx build --platform=linux/arm64 -t <tag> -f <docker-file> .

gregjhogan

nmap -p <port> 192.168.0.*|grep -B3 open

gregjhogan

# default theme broken and not available after upgrade from ubuntu 18.04
# running these two commands seems to fix it
sudo apt-get --reinstall install ubuntu-session
sudo apt-get --reinstall install yaru-*
# optionally reset everything
dconf reset -f /org/gnome/
# tweak tool to select theme
sudo apt-get install gnome-tweak
# add adwaita-dark theme variant
sudo apt-get install gnome-themes-extra

gregjhogan

find . -print -delete | pv -l > /dev/null

gregjhogan

gsettings set org.gnome.desktop.background picture-options 'none'
gsettings set org.gnome.desktop.background primary-color '#000000'