Mohsen Khanpour mohsenkhanpour

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

How to mount a qcow2 disk image

This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running.

Step 1 - Enable NBD on the Host

modprobe nbd max_part=8

Bash Shortcuts

Moving

command	description
ctrl + a	Goto BEGINNING of command line

Get node binary (node.exe) from http://nodejs.org/download/
Create the folder where node will reside and move node.exe to it
Download the last zip version of npm from http://nodejs.org/dist/npm
Unpack the zip inside the node folder
Download the last tgz version of npm from http://nodejs.org/dist/npm
Open the tgz file and unpack only the file bin/npm (without extension) directly on the node folder.
Add the the node folder and the packages/bin folder to PATH
On a command prompt execute npm install -g npm to update npm to the latest version

Now you can use npm and node from windows cmd or from bash shell like Git Bash of msysgit.

Some examples of SNAT, DNAT with iptables with comments

mainly used in start-up script

How to test 'safely'

When we play with iptables aka firewall we might end up in situation, where we execute rule, which has unforseen impact - lock yourself out. Recovering from this situation is necessity.

How to:

Enable reboot via SMS.

Test all commands in shell first before putting them into Start-up script. This way the command will be wiped out, when unit is rebooted.

	echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc
	. ~/.bashrc
	mkdir ~/local
	mkdir ~/node-latest-install
	cd ~/node-latest-install
	curl http://nodejs.org/dist/node-latest.tar.gz \| tar xz --strip-components=1
	./configure --prefix=~/local
	make install # ok, fine, this step probably takes more than 30 seconds...
	curl https://www.npmjs.org/install.sh \| sh

	#!/bin/bash
	declare -i f=75 s=13 r=2000 t=0 c=1 n=0 l=0
	declare -ir w=$(tput cols) h=$(tput lines)
	declare -i x=$((w/2)) y=$((h/2))
	declare -ar v=( [00]="\x83" [01]="\x8f" [03]="\x93"
	[10]="\x9b" [11]="\x81" [12]="\x93"
	[21]="\x97" [22]="\x83" [23]="\x9b"
	[30]="\x97" [32]="\x8f" [33]="\x81" )

	OPTIND=1

	# abort if already under tmux
	[[ -n $TMUX_PANE ]] && return

	# zsh-specific includes
	zmodload -i zsh/datetime
	zmodload -i zsh/stat

	# place to store the chart
	RAINBARF_OUT=~/.rainbarf.out
	# update period, in seconds

	var self = window;

	(function(self) {

	var canvas, context, particles = [], explode = true, FPS = 60;

	/*
	* Init.
	*/

	#!/bin/bash

	mkdir -p ~/.ssh

	# generate new personal ed25519 ssh keys
	ssh-keygen -o -a 100 -t ed25519 -f ~/.ssh/id_ed25519 -C "rob thijssen <[email protected]>"
	ssh-keygen -o -a 100 -t ed25519 -f ~/.ssh/id_robtn -C "rob thijssen <[email protected]>"

	# generate new host cert authority (host_ca) ed25519 ssh key
	# used for signing host keys and creating host certs