Basic Linux Commands...

In this tutorial you will learn to use linux terminal. You will learn to navigate on the terminal, learn to create and remove file and much more. Most of this commands also works on Mac Os X and powershell on windows.

What Is Terminal ?
Basically you are reading this tutorial because you are new to linux or want to learn using terminal to navigate. Before you get started you must have linux installed or running virtually on your computer. I would recommend downloading fedora or ubuntu (If you have trouble installing ubuntu leave a comment below and i will post a tutorial).

List of OS used in Mobiles...

Android

Android is the name of the Linux based operating system that is backed by Google and the other members of the Open Handset Alliance. Because of Android’s open source nature, Android based smartphones should be cheaper to produce than those that use operating systems.
And there are various mobile which used this operating system And some top smartphone which use the same platform like Sony xperia , HTC Desite , LG optimus etc

Apple iOS

Apple released the iOS operating system which is used in iPhone was launched on 29^th June 2007 when the iPhone was developed. Since then there were many updates of iOS and the latest one is the iOS 6. Apple iOS is unique and is only for Apple iPhone & iPad and no other manufacturer can use this operating system platform.
Some of the latest Windows Phones are iPhone, iPhone 2G, iPhone 3G,  iPhone 4, iPhone 4S, iPad, iPad2, iPad3.

Blackberry OS

Blackberry OS developed by Research In Motion (RIM) and was released in 1999. BlackBerry Os is running on every smartphone which is designed by RIM and the strange part is that Blackberry OS is totally dissimilar from other operating systems.
Some of the latest Phones are Blackberry Bold, Blackberry Curve, Blackberry Torch.

Frequently Used LINUX Commands With Examples....

1. tar command examples

Create a new tar archive.

$ tar cvf archive_name.tar dirname/

Extract from an existing tar archive.

$ tar xvf archive_name.tar

View an existing tar archive.

$ tar tvf archive_name.tar

More tar examples: The Ultimate Tar Command Tutorial with 10 Practical Examples
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2. grep command examples

Search for a given string in a file (case in-sensitive search).

$ grep -i "the" demo_file

Print the matched line, along with the 3 lines after it.

$ grep -A 3 -i "example" demo_text

Search for a given string in all files recursively

$ grep -r "ramesh" *

More grep examples: Get a Grip on the Grep! – 15 Practical Grep Command Examples
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3. find command examples

Find files using file-name ( case in-sensitve find)

# find -iname "MyCProgram.c"

Execute commands on files found by the find command

$ find -iname "MyCProgram.c" -exec md5sum {} \;

Find all empty files in home directory

# find ~ -empty

More find examples: Mommy, I found it! — 15 Practical Linux Find Command Examples
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4. ssh command examples
Login to remote host

ssh -l jsmith remotehost.example.com

Debug ssh client

ssh -v -l jsmith remotehost.example.com

Display ssh client version

$ ssh -V
OpenSSH_3.9p1, OpenSSL 0.9.7a Feb 19 2003

More ssh examples: 5 Basic Linux SSH Client Commands
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5. sed command examples
When you copy a DOS file to Unix, you could find \r\n in the end of each line. This example converts the DOS file format to Unix file format using sed command.

$sed 's/.$//' filename

Print file content in reverse order

$ sed -n '1!G;h;$p' thegeekstuff.txt

Add line number for all non-empty-lines in a file

$ sed '/./=' thegeekstuff.txt | sed 'N; s/\n/ /'

More sed examples: Advanced Sed Substitution Examples
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40+ OS Written in C Program...

Do you know 40+ Operating systems written in C programming .

DG/UX
DDC-l
OpenVMS
Ultrix
HP-UX
Enea OSE
Google Chrome OS
Android
HP-UX 11i
z/OS
AIX (Advanced Interactive Exective)
OpenSolaris
OS/2
IBM Academic Operating System
ICL VME (Virtual Machine Entertainment)
MicroC/OS-III
WindowsNT
Windows CE
Singularity Operating System
RTXC Quadros
OS-9
Solaris
UNIX
Minix
BSD Unix
Darwin
Linux
OpenIndiana
ReactOS
Inferno
MorphOS
EmuTOS
iOS
Maemo
Windows Phone
iPoadLinux
Rockbox
eCos
ThreadX
Unix
AmigaOS
Mint (Mint is now Tos)