Raspberry Pi B+

Use a USB to mini-USB cable as a power supply between TV (or similar) and Pi.

Webp and Linux

Install the package webp:

# sudo apt-get install webp

Now you can convert image files with cwebp:

# cweb file.png -o file.webp

Or decompress via dwebp.

Windows improved

Today's work on a Windows system was pleasant. W10 is a great improvement. But I still prefer Linux.

Tex to Docx

So you want to translate .tex to .dex? It's easy. Use pandoc:

# /home/per/Dropbox/ddfo/sit_lux/synopsis.tex

Cannot connect to Philips Hue

For some reason Philips Hue cannot get an ip-address it seems. So the system is basicly useless. I have tried several reboots of the router, the Hue thing etc. Nothing has helped so har.

I suspect an error because my Android phone wants the same IP. However if I turn off the phone and boot from rock bottom there is only light in two LEDs.

Synchroniz Tomboy Notes

If you have more than one computer: save the notes on Dropbox. Then synchronize your systems with that folder. It works like a charm.

Docx - cannot print properly from Linux

Skyprinting from Linux or Windows does not give the same result. I'm not printing from Libre Office. I just upload the file from the directory. My conclusion: .docx is not an open format at all. You have to print from Windows.

Latex and Your Organization

As a researcher and author it's obvious to write in the Latex format. But when you hand in your work, you often have to downscale to some MS Word .docx template. I can do it. But I don't love .docx.

Lyx Debugging

Getting an error in Lyx is pretty normal. That is when you try to compile to .dvi or .pdf. But how can you edit an error in myfile.lyx in line 666? From inside Lyx it's not possible to edit the source. As far as I know, that is.

So, the quick a dirty solution is:

1. Get out of the file in Lyx.
2. Open the file in your favorite editor (vi, nano, gedit ... etc.)
3. Go to the line with an error. 
4. Fix or remove whatever seems wrong. 
5. Save and open the file in Lyx again.
6. Compile ... and hope for the best.

Sometimes the error may have it's origin from a bibtex file. Same recipe here.

Lyx header for a Paper

Latex header sample.

• Colored table cells
• Author / year bibliography
• Somewhat scalable tables

The Latex header:

\usepackage{comment}
\begin{comment}
 
 TABELLER FARVER OG MULTICOLUMN
 Formatterer farvede tabeller.
 Husk: man kan definere farvekoder.

\end{comment}
\usepackage{multirow} 
\usepackage[table]{xcolor}
\usepackage{graphicx}

\begin{comment} 
 HEADER OG FOOTER
 Indsæt herunder
\end{comment}

\lhead{"Et in arcadea ego"}
\rhead{Per Thykjær Jensen}
\chead{2016}

\bibliographystyle{plainnat}
\usepackage{graphicx}

HP Elitebook / Ubuntu Studio: battery decharge after shutdown

Trying this recipe.

# sudo -i
# gedit gedit /etc/default/grub

Change the line to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force"

Dropped Linux Mint

Well ... I tried and tried, but never found a  cure fore the unstable wifi under Linux Mint. So I dropped Mint in favor of Ubuntu Studio Edition. I teach multimedia design. So it must be a good match.

LInux MInt: unstable wifi

Yep, it's still a problem. Tried this recipe: http://ubuntuforums.org/showthread.php?t=1980142

Linux Mint: Network Manager Headache

The network manager unconnects randomly. It's annoying during streams or online games. I have tried to install wicd, but cannot make the network manager inactive.

Removing the darn thing results in a dark screen. It's almost a Windows blue screen of death experience. And I've had this experience twice.

So now I'm left with a blank screen, gde hangs.

What are my options? Trying:

• Install KDE
• apt-get install kde-full

If that does not work the only option is to reinstall the entire system. For the third time.

Perhaps the HP EliteBook favors another Linux flavour?

The trick worked. After installing KDE wicd runs like a charm .. in KDE that is.

Gulp

I've experimented with automation, here's the first Gulp file (yea, it's work in progress).

 
/* 

GULP - watch and compile code 
=============================

File: gulpfile.js
Version: 0.1
Tags: Sass watch, Sass compile
By: Per Thykjaer Jensen
Url: http://multimusen.dk/

## Howto

 1. Download plugin
 2. Require the plugin
 3. Define a gulp.task

Run the task either:

 * :: gulp [taskname]
 * or add the task to the gulp.task default and run via :: gulp

Best Practise
=============

Separate your working files into a src/ and a dest/ directory. 
This is my first playground, so the pressent file 
structure is a darn mess.

*/

//'use strict';

// === Gulps ===
var gulp = require('gulp');
var sass = require('gulp-sass');


// sass compiler
gulp.task('sass', function () {
  return gulp.src('./sass/**/*.scss')
    .pipe(sass.sync().on('error', sass.logError))
    .pipe(gulp.dest('.'));
});

// watcher
gulp.task('sass:watch', function () {
  gulp.watch('./sass/**/*.scss', ['sass']);
});

// sass lint
var sassLint = require('gulp-sass-lint');
 
gulp.task('sassLint', function () {
  gulp.src('sass/**/*.s+(a|c)ss')
    .pipe(sassLint())
    .pipe(sassLint.format())
    .pipe(sassLint.failOnError());
});

// minify images
var imagemin = require('gulp-imagemin');
 
gulp.task('imageMin', function () {
 gulp.src('images/*')
  .pipe(imagemin())
  .pipe(gulp.dest('images/mini'));
});


// === Javascript Lint ===
var jslint = require('gulp-jslint');
var jshint = require('gulp-jshint');
 
gulp.task('lintJs', function () {
    return gulp.src(['js/*.js'])
        .pipe(jshint({ /* lint placeholder */ }))
  .pipe(jshint.reporter());

});


// === Jade Template Engine ===
jade = require('gulp-jade');

// run this task by typing in gulp jade in CLI
gulp.task('jade', function() {
    return gulp.src('src/templates/**/*.jade')
        .pipe(jade()) // pip to jade plugin
        .pipe(gulp.dest('builds/development')); 
});


// === Default ===
gulp.task('default', [
  'sass',
  'sass:watch',
  'imageMin',
  'lintJs'], function() {
});

Write permission in /var/www/html/

# sudo usermod -a -G www-data[USERNAME]
# sudo chmod -R g+w /var/www
# su [USERNAME]

ad 1) Add the user to the www-data group
ad 2) Give write permissions to the group in /var/www
ad 3) Be that user and edit

Index Acta Masonica

Created this model and implemented it in PhpMyadmin. Seems to work all right.

Noscript: a candidate for the most useless plugin for Firefox

Tried the Noscript plugin for Firefox. Yeah: it really blocked all scripts. And nothing worked. Not even a search on Duckduckgo. My browser was probably secured.

But it was also totally useless.

So I decided to dump the darn thing.

CakePhp still sucks

Well, I just gave CakePHP one more chance. After a whole day of errors, I guess that enough is enough. Again: the system sucks big time.

Ruby server: the long and winding road

Not elegant, mostly try and error. Eventually everything seems to work, here's the history:

 234  sudo apt-get install build-essential
  235  rails server
  236  rails
  237  ls
  238  cd rails
  239  bin/rails server
  240  ls
  241  cd blog
  242  bin/rails server
  243  gem install bundler
  244  sudo gem install bundler
  245  bin/rails server
  246  bundle install server
  247  bundle install
  248  gem install json
  249  sudo gem install json
  250  rails server
  251  bundle install
  252  sudo apt-get install libgmp-dev
  253  sudo apt-get install libgmp-dev
  254  rails server
  255  bundle install
  256  sudo apt-get install ruby-full build-essential
  257  sudo apt-get install apache2 apache2-mpm-prefork apache2-prefork-dev
  258  sudo apt-get install rubygems
  259  rails -v
  260  sudo apt-get install rails
  261  sudo gem install rails
  262  rails -v
  263  gem update --system
  264  \curl -L https://get.rvm.io | bash -s stable --rails
  265  rails -v
  266  bundle install
  267  rails -v
  268  rails server

Lyx and Bibtex: convert .bib file to 8859-1

1. Install KbibTex.
2. Open your .bib file.
3. Save as  ....bib - and remember so set the fileformat to 8859-1.

Processing - cross platform

Processing can export to Windows and Linux. For a Mac you need a developer license. Alternative: publish in Python. In the wiki it's said that you need to run OS X in order to export to that OS.

WordPress Xampp on Mac - how to install themes or plugins

On a Mac WordPress via Xampp you cannot install themes or plugins because of the settings. In a terminal do like this:

# sudo -i
# (write your password)
# cd /Applications/Xampp/xamppfiles

Now find out where your WordPress files are and cd to the relevant folder, then do something like this:

# chmod -R 777 wordpress/
# chown daemon:daemon wordpress/

Now ... this is a quick and very, very dirty fix. In a production environment the folders should have chmod 755 and the files chmod 644.