jhrr

Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"

Results

This is my recommended path for learning Haskell.

Something to keep in mind: don't sweat the stuff you don't understand immediately. Just keep moving.

Primary course

Installing Haskell

Ubuntu PPA

This is not intended to be comprehensive or authoritative, just free online resources I've found valuable while learning more about Erlang.

Similar lists

Instruction

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

CSS Layout Debugger

A tweet-sized debugger for visualizing your CSS layouts. Outlines every DOM element on your page a random (valid) CSS hex color.

One-line version to paste in your DevTools

Use $$ if your browser aliases it:

~ 108 byte version

Every so often I have to restore my gpg keys and I'm never sure how best to do it. So, I've spent some time playing around with the various ways to export/import (backup/restore) keys.

Method 1

Backup the public and secret keyrings and trust database

cp ~/.gnupg/pubring.gpg /path/to/backups/
cp ~/.gnupg/secring.gpg /path/to/backups/
cp ~/.gnupg/trustdb.gpg /path/to/backups/

or, instead of backing up trustdb...

	# In-memory Cassandra-ish thingy... useful for unit tests. Maybe useful for other
	# stuff too? No support for SuperColumns, but that should be easy enough to add.


	import bisect
	import copy
	from cassandra.ttypes import NotFoundException, Column, ColumnPath, ColumnOrSuperColumn


	class SSTable(object):

	#!/bin/bash
	#
	# DESCRIPTION:
	#
	# Set the bash prompt according to:
	# * the branch/status of the current git repository
	# * the branch of the current subversion repository
	# * the return value of the previous command
	#
	# USAGE:

	;; emacsd-tile.el -- tiling windows for emacs

	(defun swap-with (dir)
	(interactive)
	(let ((other-window (windmove-find-other-window dir)))
	(when other-window
	(let* ((this-window (selected-window))
	(this-buffer (window-buffer this-window))
	(other-buffer (window-buffer other-window))
	(this-start (window-start this-window))

	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