Books to learn Linux?
 

Im new in Linux and I just installed back track 5 r2,I want to leanr how to use it :)
and linux OS in general.So if you can help and tell me from where I start ? from learnng the commands or what ?
i prefer pdf or word file and thanks

The first thing I would recommend is to install a Linux distribution that is more aimed at beginners, not one made from security and network experts for security and network experts. You won't be able to use those tools without the appropriate knowledge in a senseful (not illegal) way anyways.
Go for Ubuntu, Mint or any other distro aimed at desktop use, then go and read their documentation. For Ubuntu for example you can also look here for information: http://www.psychocats.net/ubuntu/
More generic information can be found here:
http://linuxcommand.org/index.php
http://linux.2038bug.com/rute-home.html

As Tobi said, Backtrack is not a distro one should start with. To answer your question it'd be nice to know why you're trying to learn Linux? What's your goal? What are you going to do? Programming? System administration? Running a file server?

I want to program ,I know you will say I should a language programming ,and Im trying to learn "C"

You can program in C on any distro, there are no limitations.

I'd suggest just starting, that's how the learning process starts, choose a distribution, say Ubuntu, install it, update it, get used to the file system, partitioning and manipulating the bootloaders. After that move to a more CLI based distro, it's a lot more work but you also learn A LOT along the way, it's sometimes tedious and frustrating but immensely rewarding.

Check distrowatch, they have several free books that can get you started. Programming can be done on any distro, get Codeblocks and start going!

1. go to distrowatch.com and choose a distro
2. as above, you can learn C on any, but you will need to use the cmd line
3. some tutorials
http://rute.2038bug.com/index.html.gz
http://www.linuxtopia.org/online_boo...ing_index.html