There are a few major of density values for our Android devices. And They are: ldpi (about 120 dpi), mdpi (160 dpi), hdpi (240 dpi), and xhdpi (320 dpi). But, how did it ended up in these values? Here’s a simple explanationby Dianne Hackborn, the Android Framework Engineer. Speaking of screen sizes, you may need to read this informationabout multiple screen support written by Android developers. And more, tips designing for Androidby Smashing Magazine.

Sejak akhir 2011 lalu saya mulai mengarungi jalanan menuju dan pulang kantor menggunakan sepeda. Ada beberapa pertimbangan mengapa akhirnya saya memutuskan membeli sepeda putih ini. Sepeda ini pada akhirnya saya gunakan untuk keperluan sehari-hari, ke kantor, hingga bersenang-senang di Car-free Day sepanjang Sudirman - Thamrin. Kemarin, 25 Januari 2012 lalu, ketika berangkat ke kantor saya melihat Jalan Rasuna Said macet sekali. Mobil bergerak pelan sekali dan ini di luar hari-hari biasa.

UNIX is one of Dennis Ritchie’s best inventions. And it is most used operating system for servers as well as workstations. As for servers, having a good system administrator is a must. Actually, there are many roles of system administrator. From installation, monitor system performance, backup and restore, to setup security policies and so on and so forth. But, the most important thing to do for sysadmin is one thing. Problem solving.

Working on Linux environment is much easier and –a lot faster– when you know how to use command line. Even knowing basic operation of command line is more than enough if you know the combinations. One of powerful commands in Linux is find. With this four character you find almost anything, from file located inside a directory to specific category of files or even rename files with particular condition. All can be done with find–and its combination of course.

I am in a habit of using [Shift] + [Del]combination to delete files rather than delete only. I won’t store not-so-important files in my Recycle Bin, that’s why. This is a good habit in one hand and bad in the other hand because there’s a chance I accidentally delete an important file/folder. Luckily, Linux (Ubuntu in this case) has few good tools to recover deleted data and in easy ways. In this post I will show you how to recover deleted file via Ubuntu with Scalpel.