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hacking the mainframe

henri / virsh_cheatsheet.txt

Created May 2, 2023 01:18

virsh cheatsheet (kvm/qemu/vm/virtual)

	# set a domain to auto start
	virsh autostart <machine/domain>

	# show all domains set to autostart
	virsh list --all --autostart

	# show all domains not set to autostart
	virsh list --all --no-autostart

henri / lsof_cheat_sheet.txt

Last active April 24, 2023 04:59

lsof cheat sheet

	# show open TCP ports which are listening on the host
	sudo lsof -nP -iTCP -sTCP:LISTEN

henri / .tmux.conf

Last active March 7, 2025 10:22

tmux cheatsheet

	# sorce in other config files
	# source-file ~/.conf/tmux/tmux_reset.conf

	# bind alt arrorw keys for switching panes
	bind -n M-Left select-pane -L
	bind -n M-Right select-pane -R
	bind -n M-Up select-pane -U
	bind -n M-Down select-pane -D

	# start window number at 1 rather than zero (good if you do not have a numpad on your keyboard)

henri / wiregaurd-cheat-sheet.txt

Last active July 10, 2024 03:24

wiregaurd cheatsheet

	# basic status information
	wg show

	# enable wiregaurd unit (interface wg0) with systemctl
	sudo systemctl enable --now wg-quick@wg0

	# disable wiregaurd unit (interface wg0) with systemctl
	sudo systemctl disable --now wg-quick@wg0

	# bring up wireguard (interface wg0)

henri / fish_config_cheat_sheet.txt

Last active March 25, 2025 23:32

fish_config_cheat_sheet



	# Edits you can make to ~/.config/fish/config.fish


	# do not compress the PWD readout
	set fish_prompt_pwd_dir_length 0


	# remove the fish greeting or set it to something else

henri / gist:e10b60c467432f884ef0632ce865a2a2

Last active January 22, 2023 23:04

disk_space_email_alert.bash

	#!/bin/bash

	# requires sendEmail to be installed.

	SYSTEM_NAME="hostname"
	FROM_EMAIL="[email protected]"
	TO_EMAIL="[email protected] [email protected]"
	SMTP_SERVER_NAME="smtp.com:587"
	SMTP_USER_NAME="smtp__user_name"
	SMTP_PASS="smtp_password"

henri / apt_cheat_sheet.txt

Last active May 4, 2025 22:32

apt cheat sheet

	### APT Tips (tested only on Ubuntu)
	##
	## Problem :
	## The following packages have been kept back
	##
	## Possible Solutions (depending on the situation) :

	# non-manual upgrade of kept back packages (safest) :
	sudo apt-get --with-new-pkgs upgrade
	sudo apt-get --with-new-pkgs upgrade <list of packages kept back>

henri / 001.awk_cheatsheet.txt

Last active February 4, 2025 01:11

AWK Cheatsheet

	# How to just buffer each line (rather than the entire input stream) when using awk / gawk to read data from a pipe.
	awk '{ print $0 ; system("") }' # compatible with POSIX complient systems
	gawk '{ print $0 ; system("") }' # gawk is smart and will not actually start a sub-shell

	# fflush - is going to offer something similar (although you can speicify which kind of output you would like to flush).

henri / clear_arp_cache.bash

Created October 31, 2022 22:46

MacOS Clear ARP Cache Script

	#!/bin/bash

	# This script is used to clear the arp cache on macOS - it may even work on other operating systems
	# (C)2005 Henri Shustak
	# Released Under MIT Licence : http://mit-license.org

	# check we are running as root
	currentUser=`whoami`
	if [ $currentUser != "root" ] ; then
	echo This script must be run with super user privileges

henri / macOS flush dns cache

Created October 20, 2022 22:38

Flush DNS cache on macOS system

	# macOS 10.15 and later
	sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder