Rada Bogdan bogdanRada

This will show how to run an emulated arm64 virtual machine under qemu.

It first shows how to launch a typical amd64 virtual machine to make sure we have cloud-init working.

Then it shows how to launch the arm64 (aka aarch64) virtual machine.

NB In my humble i3-3245 amd64 host this is way too slow to run anything useful as it takes about 6m to allow you to finally login, and after that, its slow too. You are really better off with a proper physical arm64 machine, like:

System Updates

http://bookofzeus.com/harden-ubuntu/initial-setup/system-updates/

Keeping the system updated is vital before starting anything on your system. This will prevent people to use known vulnerabilities to enter in your system.

sudo apt-get update
sudo apt-get upgrade
sudo apt-get autoremove
sudo apt-get autoclean

RSYNC

FROM: https://stackoverflow.com/questions/20969124/how-to-diff-directories-over-ssh

Try using "rsync" with the "-n" option, which just does a "dry run" and tells you what it would do.

answered Jan 7 '14 at 10:39 Mark Setchell

-c will tell rsync to look at checksums, not just date & length – Mike Aug 5 '14 at 22:07

Stackoverflow answer link - https://stackoverflow.com/a/2068371/867451

Copied the content for quick reference

Each YouTube video has four generated images. They are predictably formatted as follows:

https://img.youtube.com/vi/<insert-youtube-video-id-here>/0.jpg

https://img.youtube.com/vi/<insert-youtube-video-id-here>/1.jpg

Converting mkv to mp4 with `ffmpeg`

Essentially just copy the existing video and audio stream as is into a new container, no funny business!

The easiest way to "convert" MKV to MP4, is to copy the existing video and audio streams and place them into a new container. This avoids any encoding task and hence no quality will be lost, it is also a fairly quick process and requires very little CPU power. The main factor is disk read/write speed.

With ffmpeg this can be achieved with -c copy. Older examples may use -vcodec copy -acodec copy which does the same thing.

These examples assume ffmpeg is in your PATH. If not just substitute with the full path to your ffmpeg binary.

	# This template is inspired on https://gist.githubusercontent.com/lazaronixon/7815d84702f277ead5e89c9f2aa5581f/raw/rubocop.yml

	require:
	- rubocop-performance
	- rubocop-rails
	- rubocop-rspec

	Rails:
	Enabled: true

	# Just a copy of https://stackoverflow.com/a/30724359/1825727
	def from_hashstring(value)
	json_string = value
	.gsub(/([{,]\s):([^>\s]+)\s=>/, '\1"\2"=>') # Handle ruby symbols as keys
	.gsub(/([{,]\s)([0-9]+\.?[0-9])\s*=>/, '\1"\2"=>') # Handle numbers as keys
	.gsub(/([{,]\s)(".+?"\|[0-9]+\.?[0-9])\s=>\s:([^,}\s]+\s*)/, '\1\2=>"\3"') # Handle symbols as values
	.gsub(/([\[,]\s*):([^,\]\s]+)/, '\1"\2"') # Handle symbols in arrays
	.gsub(/([{,]\s)(".+?"\|[0-9]+\.?[0-9])\s*=>/, '\1\2:') # Finally, convert => to :

	JSON.parse(json_string)


	# Search filename in stash
	function gitsearch()
	{
	searchCrit='stash\\|'$1
	git stash list \| while IFS=: read STASH ETC; do echo "$STASH: $ETC"; git diff --stat $STASH~..$STASH --; done \| grep -e $searchCrit
	}
	alias githunt=gitsearch

	#!/bin/sh
	#
	# This script should be run via curl:
	# sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"
	# or wget:
	# sh -c "$(wget -qO- https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"
	#
	# As an alternative, you can first download the install script and run it afterwards:
	# wget https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh
	# sh install.sh