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UDF is the File Format used in CDs DVDs, just like your other File Formats like FAT, FAT32, NTFS, HFS, EXT etc., Most DVD videos uses UDF file format.
Or if your refering the .udf file extension, its an image of CD/DVD created using MagicISO or similar ISO authoring tools. You need MagicISO to open and extract it.
There are different Distros (or Packages) of linux. They all are same except there use of Desktop enviornment and the software packages comes with them.
All the Distros will have a Kernal and a Shell or File Manager or Desktop Enviornment (like Windows Explorer in Windows systems).
Most Popular Distros are Ubuntu, Xubuntu, Kubuntu, Arch Linux, Fedora, Redhat, Knopix, GOS, Slax,Backtrack, MintOS, pclinux etc.
There are mainly three Desktop Enviornments, namely Gnome, KDE and XFCE
Ubuntu uses Gnome - its almost like Windows Explorer
Kubuntu uses KDE as its default Desktop Enviornment, it looks cool, but bit heavy on the system.
Xubuntu uses XFCE - this is the litest of 'em all.
Ubuntu and its derivatives (Kubuntu and Xubuntu) releases new Versions every 6 months, and the Version number stands for the Year and Month of its release, Eg: Ubuntu 8.10 implies it is released on October 2008.
Best thing about the Ubuntu is its a well supported and well maintained Distro, gets updates and patches regularly.
If you are new to Linux, go for Ubuntu its almost like Windows. Download the iso file from Ubuntu site, burn it, restart your system and boot from the CD. as its LiveCD, you can use the full power of Ubuntu without installing a single file on your hard Disk. IF you need any help in getting and running Ubuntu or any other linux distro, let me know.
And about Commands, Most Bash Commands (the command system or scripting system used in linux) works on all linux distros.
You can even run almost all Windows applications and Games on Linux nowadays using WINE.
P.S: Am a big Linux and Open Source Software Supporter/Contributor and uses Backtrack 3 and Ubuntu.
P.S 2: working on saturdays sucks.
Hell was Full, So ma came Back!!!!
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