gregjhogan’s gists

gregjhogan / 7z-cpu-benchmark.sh

Created June 7, 2021 23:08

7z CPU benchmark

gregjhogan / git-config-fetch-all-branches.sh

Created June 1, 2021 23:18

git config update to fetch all branches

	# get config for which branches will get pulled
	git config --get remote.origin.fetch
	# e.g. only master: +refs/heads/master:refs/remotes/origin/master

	# set config to pull all branches
	git config remote.origin.fetch "+refs/heads/:refs/remotes/origin/"

gregjhogan / relocate-bad-block.sh

Last active May 21, 2021 18:32

relocate bad block

	# https://wiki.archlinux.org/title/Identify_damaged_files#Force_the_disk_to_reallocate_bad_block

	# scan entire disk for bad blocks (slow but complete)
	sudo badblocks -v -b 4096 /dev/sda

	# smartctl test find bad block (fast but not complete)
	sudo smartctl -t short /dev/sda
	# get block number of error
	sudo smartctl -a /dev/sda
	...

gregjhogan / ext4-vs-xfs-max-usable-space.sh

Last active February 26, 2023 14:47

ext4 vs xfs max usable space for 16 TB drive

	# 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 / ssh-keygen--host-key-to-custom-output-dir.sh

Created March 3, 2021 02:04

generate ssh host keys for sshd and output to a non-standard location

	#!/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 / ubuntu-20.04-fix-spotify-deb-install.sh

Created December 2, 2020 22:24

Ubuntu 20.04 fix Spotify deb install offline (error code: 4)

	# 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 / ssh-keygen-rm-known-hosts.sh

Created October 29, 2020 19:01

ssh-keygen remove hosts from known_hosts

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

gregjhogan / ssh-keyscan-add-known-hosts.sh

Created October 29, 2020 18:26

ssh-keyscan add hosts to known_hosts

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

gregjhogan / docker-buildx-arm64.sh

Last active July 1, 2020 03:46

setup and build an arm64 docker image on x86/amd64

	# 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-scan-show-open.sh

Created June 11, 2020 22:06

nmap scan for port open and only show open results

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

Greg Hogan gregjhogan