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Showing posts from June, 2013

Keep web sites readable on mobiles HD screens

As I was working on a new web project which mixed mobiles devices and PCs, I realized that it could be a problem to keep working in pixels to define page elements. Let's take an example :

Create a basic website not specific to mobile devices. Open it on a low resolution screen (such as a Samsung Galaxy Mini). Consider that the text is readable. Now, let's open the same page on a high resolution screen. Text will be too small.

What's the fuck???

By defaut, mobiles (and tablets) lie about their screen resolution

The first thing to know is that 1 pixel is 1 pixel on PCs (for the moment). On mobiles, 1 pixel = 1 "CSS pixel". Hey, what are "CSS pixels". It's easy to understand. Here are real screen resolutions :

320x480px on iPhone 3640x960px on iPhone 4640x1136px on iPhone 5768x1024px on iPad 21536x2048px on iPad 3
But, if you ask for the current resolution in javascript (screen.width), you will retrieve :

320x480px on iPhone 3320x480px on iPhone 4320x568…

Colorize your MacOS X shell

I was tired of my green shell on my Mac and I really prefer the default shell on Ubuntu. So, I googled a few minutes and find a solution.

First of all, each time you open a new shell, MacOS executes your .bach_profile. (It's quite different on Mac compared to Linux. On Linux, the .bash_profile is executed when you open a new session while .bash_rc is executed each time you launch a shell. On Mac, there's no .bash_rc so we use .bash_profile).

So, let's create/edit your .bash_profile with nano .bash_profile and copy paste the following lines. Restart your shell and enjoy the difference.

export CLICOLOR=1
export LSCOLORS=ExFxBxDxCxegedabagacad

How to know if you have a 32 bits or a 64 bits Linux kernel?

Want to install an application on your favorite Linux but you forgot if it a 32 bits or a 64 bits one and you don't know which package you have to download? Don't panic. Just type in a console :

file /sbin/init

This will check /sbin/init file type and you will see if it is a 32 bits or a 64 bits executable file. I tested it on Ubuntu 13.04 and CentOS 6.4.