David Charte fdavidcl

This was tested on a ThinkPad P70 laptop with an Intel integrated graphics and an NVIDIA GPU:

lspci | egrep 'VGA|3D'
00:02.0 VGA compatible controller: Intel Corporation Device 191b (rev 06)
01:00.0 VGA compatible controller: NVIDIA Corporation GM204GLM [Quadro M3000M] (rev a1)

A reason to use the integrated graphics for display is if installing the NVIDIA drivers causes the display to stop working properly. In my case, Ubuntu would get stuck in a login loop after installing the NVIDIA drivers. This happened regardless if I installed the drivers from the "Additional Drivers" tab in "System Settings" or the ppa:graphics-drivers/ppa in the command-line.

Auto-deploying built products to gh-pages with GitHub Actions

This is a set up for projects which want to check in only their source files, but have their gh-pages branch automatically updated with some compiled output every time they push.

A file below this one contains the steps for doing this with Travis CI. However, these days I recommend GitHub Actions, for the following reasons:

It is much easier and requires less steps, because you are already authenticated with GitHub, so you don't need to share secret keys across services like you do when coordinate Travis CI and GitHub.
It is free, with no quotas.
Anecdotally, builds are much faster with GitHub Actions than with Travis CI, especially in terms of time spent waiting for a builder.

This can reduce files to ~15% of their size (2.3M to 345K, in one case) with no obvious degradation of quality.

ghostscript -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/printer -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf

Other options for PDFSETTINGS:

/screen selects low-resolution output similar to the Acrobat Distiller "Screen Optimized" setting.
/ebook selects medium-resolution output similar to the Acrobat Distiller "eBook" setting.
/printer selects output similar to the Acrobat Distiller "Print Optimized" setting.
/prepress selects output similar to Acrobat Distiller "Prepress Optimized" setting.

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

	{-# LANGUAGE OverloadedStrings #-}
	import Text.Pandoc.JSON
	import System.Directory
	import System.FilePath ((</>))
	import qualified Data.Hash.MD5 as MD5
	import qualified Data.Text as T
	import System.IO.Temp
	import System.Process
	import Control.Monad (unless)

	#!/bin/bash
	#hasselhoff attack taken to a new level
	#@angrykoala

	DIR=/home/$(whoami)/hasselhoff.jpg
	MESSAGE="you have been hasselhoffed"
	IMAGE_URL=http://www.ljpaez.es/imagen/hasselhoff.jpg
	wget $IMAGE_URL -q
	mv ./hasselhoff.jpg $DIR
	gsettings set org.gnome.desktop.background picture-uri file://$DIR

	# The blog post that started it all: https://neocities.org/blog/the-fcc-is-now-rate-limited
	#
	# Current known FCC address ranges:
	# https://news.ycombinator.com/item?id=7716915
	#
	# Confirm/locate FCC IP ranges with this: http://whois.arin.net/rest/net/NET-165-135-0-0-1/pft
	#
	# In your nginx.conf:

	location / {

	#this script can never fail
	#i use it in the fish_config
	#call it with start_agent

	setenv SSH_ENV $HOME/.ssh/environment


	function start_agent
	if [ -n "$SSH_AGENT_PID" ]
	ps -ef \| grep $SSH_AGENT_PID \| grep ssh-agent > /dev/null

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	## 2010-06-25
	## (c) Felix Andrews <[email protected]>
	## GPL-2

	## If 'which' is given it should be a logical matrix specifying bold cells.
	## Otherwise: in each column or row with numeric data, the maximum or minimum
	## value is set bold; 'max' can have entries for each column/row, NA means skip.

	## Examples:
	## library(xtable)