Riccardo M. BIANCHI, PhD ric-bianchi

Vagrant Setup

This tutorial guides you through creating your first Vagrant project.

We start with a generic Ubuntu VM, and use the Chef provisioning tool to:

install packages for vim, git
create user accounts, as specified in included JSON config files
install specified user dotfiles (.bashrc, .vimrc, etc) from a git repository

Afterwards, we'll see how easy it is to package our newly provisioned VM

CERN Hacks

This Gist is a guide on how to setup your computer at CERN with Ubuntu 14.04 LTS. Last tested by myself on a brand new computer on 18/11/2014, proof tested by @Alea88.

NOTE (26-02-2015)

With the kernel upgrade from 3.13.0-45-generic to 3.13.0-46-generic AFS stops working: https://bugs.launchpad.net/ubuntu/+source/openafs/+bug/1423151

Type this to check your kernel version:

Profiling an application in Mac OS X

Finding which process to profile

If your system is running slowly, perhaps a process is using too much CPU time and won't let other processes run smoothly. To find out which processes are taking up a lot of CPU time, you can use Apple's Activity Monitor.

The CPU pane shows how processes are affecting CPU (processor) activity:

Install ImageMagick

brew install ImageMagick

Pull specific region of frames from video file w/ ffmpeg

ffmpeg -ss 14:55 -i video.mkv -t 5 -s 480x270 -f image2 %04d.png

-ss 14:55 gives the timestamp where I want FFmpeg to start, as a duration string.
-t 5 says how much I want FFmpeg to decode, using the same duration syntax as for -ss.
-s 480x270 tells FFmpeg to resize the video output to 480 by 270 pixels.
-f image2 selects the output format, a series of still images — make sure there are leading zeros in filename.

Effective Modern CMake

Getting Started

For a brief user-level introduction to CMake, watch C++ Weekly, Episode 78, Intro to CMake by Jason Turner. LLVM’s CMake Primer provides a good high-level introduction to the CMake syntax. Go read it now.

After that, watch Mathieu Ropert’s CppCon 2017 talk Using Modern CMake Patterns to Enforce a Good Modular Design (slides). It provides a thorough explanation of what modern CMake is and why it is so much better than “old school” CMake. The modular design ideas in this talk are based on the book [Large-Scale C++ Software Design](https://www.amazon.de/Large-Scale-Soft

	These commands are based on a askubuntu answer http://askubuntu.com/a/581497
	To install gcc-6 (gcc-6.1.1), I had to do more stuff as shown below.
	USE THOSE COMMANDS AT YOUR OWN RISK. I SHALL NOT BE RESPONSIBLE FOR ANYTHING.
	ABSOLUTELY NO WARRANTY.

	If you are still reading let's carry on with the code.

	sudo apt-get update && \
	sudo apt-get install build-essential software-properties-common -y && \
	sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && \

	# Install tmux 2.8 on Centos

	# install deps
	yum install gcc kernel-devel make ncurses-devel

	# cd src
	cd /usr/local/src

	# DOWNLOAD SOURCES FOR LIBEVENT AND MAKE AND INSTALL
	curl -LO https://github.com/libevent/libevent/releases/download/release-2.1.8-stable/libevent-2.1.8-stable.tar.gz

	set-option -g default-terminal "xterm-256color"
	set-window-option -g xterm-keys on

	run-shell "tmux setenv -g TMUX_VERSION $(tmux -V \| cut -c 6-)"

	setw -g mode-keys vi

	unbind C-b

	# remap prefix to Control + Space

	# Set the control character to Ctrl+Spacebar (instead of Ctrl+B)
	set -g prefix C-space
	unbind-key C-b
	bind-key C-space send-prefix

	# Set new panes to open in current directory
	bind c new-window -c "#{pane_current_path}"
	bind '"' split-window -c "#{pane_current_path}"
	bind % split-window -h -c "#{pane_current_path}"

	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
	<plist version="1.0">
	<dict>
	<key>Cancellation</key>
	<dict>
	<key>Cancel</key>
	<string>cancelOperation:</string>
	</dict>
	<key>Transformations</key>