arielvb’s notes¶

Pàgines especials¶

No totes les opcions de Firefox estàn accesibles des de les opcions dels menus. Algunes només es pot accedir escribint una adreça concreta a la barra de navegació i algunes de les opcions del menu tenen un accés també des de aquesta:

• about:home la pàgina definida com predeterminada.
• about:addons per accedir a la finestra de complements.
• about:memory informació sobre la gestió de memòria.
• about:support informació sobre la configuració tecnica del navegador.
• about:config consulta i modificació de paràmetres configurables del navegador i complements.

Ubuntu - Instal·lació des de els repositoris de Mozilla¶

1. Afegir repositori i instal·lar firefox:

   sudo add-apt-repository ppa:mozillateam/firefox-stable
   sudo apt-get update
   sudo apt-get upgrade
   

2. Instal·lar paquet d’idioma català, canviar ca per es si es vol castellà:

   sudo apt-get install firefox-locale-ca
   

3. Arrancar Firefox i escriure a la barra de navegació:

   about:addons
   

4. Clicar a l’icona d’eines i triar l’opció Check for updates / Comprova si hi ha actualitzacions

5. Reiniciar Firefox.

Complements¶

Url: about:addons

Llista de complements intersants:

Modify about:home search engine¶

Modify the key search-engine in the chromeappstore.sqlite inside your profile.

Default value in firefox-beta 17 is:

> sqlite3 chromeappsstore.sqlite "SELECT * FROM webappsstore2 WHERE key='search-engine';"

emoh.:moz-safe-about|search-engine|{"name":"Google","searchUrl":"https://www.google.com/search?q=_searchTerms_&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:es-ES:official&client=firefox-beta"}|0|

To set duckduckgo as search engine:

sqlite3 chromeappsstore.sqlite 'UPDATE webappsstore2 SET value=\'{"name":"DuckDuckGo","searchUrl":"https://duckduckgo.com/?q=_searchTerms_"}\' WHERE key="search-engine";'

The easy way, in the about:home page, paste in the url field:

javascript:{localStorage["search-engine"]="{\"name\":\"Google\",\"searchUrl\":\"http://www.google.com/search?q=_searchTerms_&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a\"}";void(0);}

References¶

• http://support.mozilla.org/ca/questions/779082 (2012-10-28)

Command line¶

• Create pdf from all the odt of the current dir:

  lowriter --headles --convert-to pdf *.odt
  

References¶

• https://en.wikipedia.org/wiki/Libreoffice
• https://help.libreoffice.org/Common/Starting_the_Software_With_Parameters
• http://rocreguant.com/como-instalar-un-nuevo-diccionariocorrector-para-libreoffice-en-ubuntu/270/
• http://www.computercorrect.com/2011/desktop-applications/openoffice-org/custom-fill-colors-in-openoffice-org/

Obtain images¶

You can manualy install lot of OS. But if you want to start very fast VirtualBoxImages offers ready to launch images, some are free others not.

Free VDI’s are avaible at http://virtualboximages.com/Free.VirtualBox.VDI.Downloads.

Tunning¶

SSH¶

To connect to guest using ssh, it’s needed to configure the port redirecton at the virtualbox image. You can do using the commandline or the gui.

Using the commandline (when the image is stopped):

VBoxManage modifyvm "VM name" --natpf1 "ssh,tcp,,2222,,22"

Using the gui:

Machine > Settings > Network > Port forwarding > Insert new Rule (+)

And fill the table with (4th column is empty, see pecture):

ssh | tcp | 127.0.0.1 |       | 22

SSH forwarding

API¶

Virtualbox has an API or SDK for developers, see SDK Programmin Guide at https://www.virtualbox.org/wiki/Technical_documentation

The API can’t be used with Python, Java, C++, C or Visualbasic. The following example shows how to retrive the name of the existing machines:

import vboxapi
 man = vboxapi.VirtualBoxManager(None, None)
[i.name for i in man.getArray(man.vbox, "machines")]

grep¶

Use the argument –color:

grep --color=auto

The options are:

• auto: doesn’t colorize if the output is a pipe.
• always
• never

less / more¶

Use the argument -R (or -r):

more -r

Example colorize grep output:

rgrep --color=auto TODO . | more -r

pygmentize¶

pygmentize colorizes the input allowing different lexers:

pygmentize [-l lexer] [file]

The lexer will be autodected, but if not some of the lexers are:

• rst: reStructuredText
• html
• python

Concatenate files¶

With ffmpeg, you can concatenate video/audio files, for example if you want to concat a DVD movie in a single file:

ffmpeg -i concat:VTS_01_0.VOB\|VTS_01_1.VOB\|VTS_01_2.VOB\|VTS_01_3.VOB -vcodec libxvid -qscale 0 ~/my_movie.mp4

Or if you want a single track with some of your favorites songs:

ffmpeg -i concat:song1.mp3\|song2.mp3 -c copy songs.mp3

Rotate video¶

Execute:

ffmpeg -i 2015-01-01\ 00.*mp4 -vf "transpose=1" out.mp4

For the transpose parameter you can pass:

0 = 90CounterCLockwise and Vertical Flip (default) 1 = 90Clockwise 2 = 90CounterClockwise 3 = 90Clockwise and Vertical Flip

Tips¶

List available codecs:

ffmpeg -codecs

References¶

• http://stackoverflow.com/questions/3377300/what-are-all-codecs-supported-by-ffmpeg
• http://blog.desdelinux.net/howtorippear-o-copiar-un-dvd-a-mano-con-cat-y-ffmpeg/ [spanish]
• http://stackoverflow.com/questions/3937387/rotating-videos-with-ffmpeg

Creating tiles¶

Basic usage:

convert FILE -crop geometry tiles_%d.jpg

Recomend usage for jpg files, tile + remove exif information:

convert FILE -crop geometry -strip tiles_%d.jpg

Recovering a copped image, (doesn’t work with jpg tiles):

convert tiles_*.gif -mosaic recover.gif

Creating gifs¶

convert -delay 20 -loop 0 -resize 800x522 *.jpg ../grup.gif

Slicing images¶

Slice and image in 3:

convert -crop 34%x100% +repage beach.jpg beach_%d.jpg

Installation¶

brew info sox

brew install sox

brew install sox --with-libvorbis

Usage¶

SoX is really easy to use, if you know how to use a commandline program. Take a look to the next examples, and you will discover some of the features of SoX.

1. Play an audio file:

   play filename
   

2. Convert an mp3 to ogg (the output format is autodected using the new file extension):

   sox filename newfile.ogg
   

3. Concatenate two or more audio files:

   sox filename1.wav filename2.wav filename3.wav file1to3.wav
   

Some interesting resources¶

• Sox Documentation: http://sox.sourceforge.net/sox.html
• Building sox with mp3 support on Mac: http://ggkarman.de/tech/building-sox-with-mp3-support-on-osx/

Connect via ssh [1]¶

If you have previously configured Eclipse to work with your Blacberry device, you can reuse the existing sshkey.

In Mac OS X you can find it at ~/Library/Research In Motion/ in other OS you can find the exact path in the Eclipse Preferences searching for BlackBerry Plugin.

1. Run blackberry connect, remenver change the executable path, password and ip before execute:

   /Users/arkow/projects/blackberry/blackberry.tools.SDK/bin/blackberry-connect 192.168.1.34 -sshPublicKey "/Users/arkow/Library/Research In Motion/bbt_id_rsa" -password dummypasword
   

2. Open the ssh connection, using devuser as username:

   ssh devuser@192.168.1.34 -i bbt_id_rsa
   

References¶

• http://blog.skufel.net/2012/07/how-to-access-blackberry-playbook-via-ssh/

URI’s¶

• Buildout web site: http://www.buildout.org/install.html

Utilities¶

iconv --from-code=UTF-8 --to-code=ISO-8859-1 file.csv >  file.csv

Building your sources with the commandline¶

If your sources have a .csproj/.sln file you can use mdtool to build it, if not you can compile it with Mono C# compiler (mcs).

using System;

class Hello {

    static void Main() {
        Console.WriteLine ("Hello, World!");
    }

}

mcs hello.cs && mono gendarme.exe hello.exe

using System;
using System.Reflection;
using System.Runtime.InteropServices;

[assembly: CLSCompliant (true)]
[assembly: ComVisible (false)]
[assembly: AssemblyVersion ("1.0.0.0")]

static class Hello {

    static void Main() {

        Console.WriteLine ("Hello, World!");

    }
}

References¶

• Introduction to Mono - Your first Mono app
• C# compiler Command-line options
• Walkthrough: Creating an MSBuild Project File from Scratch

Extras¶

• Using Maven with .NET

API¶

The perl api is avaible online [1]. It has also a command line tool called perldoc

Packages/Modules¶

Packages, modules or distributions can be administrated with the package manager: cpan

To install a new packages:

cpan $packagename$

Or entering in the interactive mode:

cpan
i $pacakgename$

Cheats¶

• http://perldoc.perl.org/perlcheat.html
• More visual (but less complete): http://www.cheatography.com/mishin/cheat-sheets/perlcheat/

Resize images¶

Before call pictureflow you must created a resized version of your images, or tu much memory will be allocated!

You can resize faster with imagemagick, for exemple to resize all the jpg in your folder using bash and convert:

for i in `ls *.jpg`; do convert -sample 512x512 $i 512_$i; done

This will make that PictureFlow only uses 225 MB of RAM for 250 images.

Build¶

1. Donwload last version of pictureflow from the github repository of Ariya:

   git clone https://github.com/ariya/pictureflow.git
   

1. Run go to pyctureflow-qt/pyqt/lib and run:

   qmake
   make install
   

2. If make install donsn’t copy anything, copy pictureflow lib (pictureflow.a) to:

   /Applications/QtSDK/Desktop/Qt/4.8.1/gcc/lib
   

3. Go to pyqt folter, one level up and run (better step by step):

   python configure.py
   make
   make install
   

4. Edit the demo.py file to add your image path, and run it with python.

Other references¶

PictureFlow - listing images in PyQt4 http://www.rkblog.rk.edu.pl/w/p/pictureflow-listing-images-pyqt4/

The Calibre plugin pictureflow.

Mac Os X¶

Themes¶

Some beatutiful themes from various places and authors.

• Read the docs: https://github.com/snide/sphinx_rtd_theme
• Sphinx Bootstrap: https://pypi.python.org/pypi/sphinx-bootstrap-theme

Crea lloc web¶

Cal crear un website: dominis (domini + www.domini), aplicacio, usuaris (opcional).

Crear usuari¶

1. Des de la web crear un usuari amb access a consola, més tard restringirem l’accès per a que només pugui accedir per ftp.
2. Crear la carpeta de l’aplicacio.
3. Afegir permisos d’excucio al directori de l’usuari principal al nou usuari:: setfacl -m u:[usuari]:–x $HOME
4. Afegir permisos al directori concret:: setfacl -m u:[usuari]:–x $HOME/[directori]

Git¶

Anar a la carpeta repos de l’aplicació on està instal·lat git::

cd webapps/gitpxc/repos

git init –bare {repo}.git cd {repo}.git git config http.receivepack true

Editar la descripció del projecte:

vi description

Definir els autors afegir al fitxer config:

[gitweb]
    owner = Ariel

A la nostra màquina dins de la carpeta que volem afegir al repositori:

git init
touch README
git add README
git commit -m "First commit"
git remote add origin https://dev.arielvb.com/git/{repo}.git
git push origin master

mod_wsgi i AuthUserFile¶

Per protegir directoris dins d’una aplicació amb mod_wsgi cal carregar els moduls d’Apache corresponents, ja que per defecte es carreguen.

Cal editar el fitxer apache2/conf/http.conf i afegir:

LoadModule auth_basic_module modules/mod_auth_basic.so
LoadModule authn_file_module modules/mod_authn_file.so
LoadModule authz_user_module modules/mod_authz_user.so

Si volem protegir totes les rutes cal afegir al bloc directory:

AuthUserFile [ruta al fitxer htpasswd]
AuthName "[Text a mostrar a la finestra de carrega]"
AuthType Basic
require valid-user

Si només volem protegir una part de la aplicació cal crear un nou bloc:

<Location [ruta]>
        AuthUserFile [ruta al fitxer htpasswd]
        AuthName "[Text a mostrar a la finestra de carrega]"
        AuthType Basic
        require valid-user
</Location>

Referencies¶

• http://docs.webfaction.com/software/git.html
• http://docs.webfaction.com/software/general.html#granting-access-to-specific-users
• http://community.webfaction.com/questions/256/apache-basic-authentication-for-mod_wsgi-inc-django-applications
• http://flask.pocoo.org/snippets/65/

Installation¶

export PYTHONPATH=/usr/local/Cellar/wxmac/2.9.4.0/lib/python2.7/site-packages/wx-2.9.4-osx_cocoa:$PYTHONPATH

Python Bindings¶

At the of wxpython.org you will find an example <http://wiki.wxpython.org/Using%20wxPython%20Demo%20Code> to test if everithing has been installed correctly.

A full package of demos are avaible for download at: http://wxpython.org/download.php#demo

List of commands¶

Change user shell, with chsh (add or change user database information), next changes to zsh:

chsh -s /bin/zsh

Extend Command line tools¶

brew install gettext

vi ~/.bash_profile

export PATH=${PATH}:/usr/local/opt/gettext/bin

growlnotify -t "Warning" -a Disk\ Utility -m "Replace your disk!"

growlnotify -t "My App notification" --image icatpy/icat.png  -m "Hello!"

brew install imagemagick --with-libsrvg librsvg

/Applications/Inkscape.app/Contents/Resources/bin/inkscape -f test.svg -e test.png

Remove MacOsX custom files from zip¶

To see the contents of a zip file:

unzip -l filename

To remove zip contents, for example everithing inside __MACOSX:

zip [filename] -d __MACOSX/*

To know more¶

• Export to video

Launchers¶

To create a launcher for a custom application, you must create a .desktop file under /usr/share/applications, ~/.local/share/applications or ~/Desktop

As an example the next launcher is for Blender:

[Desktop Entry]
Encoding=UTF-8
Name=Blender
Exec=/path/to/blender/executable
Icon=/path/to/blender/icon
Type=Application
Categories=Graphics;

References¶

• Desktop Files (Gnome): https://developer.gnome.org/integration-guide/stable/desktop-files.html.en
• Freedesktop Categories: http://standards.freedesktop.org/menu-spec/latest/apa.html

Tracking¶

Visualization¶

https://maps.google.com/maps?q=

Utilities¶

gpx to kml¶

This process can be done online at http://gpx2kml.com/, it offers usseful options like stats or view in Google Maps.

tags:	kml, gpx, google maps, gps

Online resources¶

• http://www.classicalmidiconnection.com
• http://www.kunstderfuge.com/
• http://www.midiworld.com/ (some aren’t free)
• http://www.piano-midi.de/

Configure VLC¶

1. Download FluidSynth version of SoundFont from http://www.schristiancollins.com/generaluser.php.
2. Open VLC’s preferences.
3. The preferences window has two display modes called Simple and All. Choose the display mode called All.
4. Go to Codecs -> Audio codecs -> FluidSynth.
5. Then select the .sf2 file with the preferences select button.

References¶

http://wiki.videolan.org/Midi