The Free contents on the Linux operating system here are Linux overview,  hints and tips, programming, example, questions with answers, FAQ and Linux interview questions you can used for your Job interviews. 

Linus Torvalds is not only the father of Linux but its heart and soul and still the main brain behind it. Every piece of code is tested by him before it is allowed to become part of the kernel.  Linus works as a programmer for Transmeta Corporation.

Linux version 0.01 posted on the net in September 1991 ready to be copied and tested by the so inclined.  Version 0.02 swiftly appeared the following month. Versions after versions followed in quick succession as the code was tested, twisted, tweaked  and overhauled. Version 1.0 was released in March 1994 and by that time the estimated number of Linnux users was half a million! Starting from what was aimed at being at an efficient operating system, today Linux can power not only things as tiny as wristwatches but huge Beowulf clusters of Supercomputers. All those breathtaking special effects that you saw in "Titanic" wouldn't have been possible but for the cheap and effective supercomputing clusters of computers powered by Linux.

Linux Forum
Post your problems to the Linux Community.  This is an email discussion group for Linux administrators, system programmers, designers, system engineers to share information and request assistance from Linux PEERS around the world.   The discussion topics should be focused on anything about Linuxx and it related issues.

Career Question
Important Of Learning Linux

Installation
General Linux Installation
Red Hat, SuSE and Mandrake Desktop Installation
How Do I Install a Program
How To Make Linux Bootable Disk

Linux Kernel Programming
Disk Partition Table (2.X)

Application
Application Programming Questions

Sharing
Share a Folder in Novell Linux Server 9

Linux Scripts
Scripting Question
Using rsync in a Script
Free Disk Space Checking in Linux
BASH Scripting Question
Sorting Numbers For Linux Scripting

Files in Linux
Tripwire for Linux File Integrity
File Permission in Linux
File System for Linux
Bash Script That Will Cut The File Up
Comment Out Some Vol Group In Fstab Accidentally
Useful Linux Files
How To logrotate httpd log Files
How To Used LS With Recursive
Deleting Restoring And Empty Trash
Compare 2 Strings Ignore Case In Bash
Get Two Strings Next To Known String
Remove Old Files From Directory
File (De) Compression

FTP
FTP Permission To More Folders
Vsftpd Upload Only For That User

Port
Port Forwarding Using Iptables
Examples Of Netfilter Port Forwarding

Samba
Brief Introduction to Samba

Logs
Very Useful Commands For Apache Logs

Tips and Tricks
Change keyboard map (mapping underscore to the Win key)
Error Installing LILO to the Master Boot Record (MBR)
Getting Anti-aliased fonts in Opera
Common Linux Hardware Devices
Common Linux Commands and Frequently Used Options
How To dual-boot with Windows
Killing Processes Command
C Programming in Linux
Script to Send eMail
Force Create Permissions
Recover Linux From Root Being Locked Out
Mount Different Folders On Disk And Locations

Windows
IP Address Conflicts During Wireless Connection

Linux Administration Handbook

Linux Programming Unleashed

Password
How to change the root password if you've forgotten it?
Prevent other people from changing your root password?

Date/Time
Convert Date Time Stamp To Epoch Time
Find The Last System Shut Down Time
Calculate Disk Queue Length And Disk Busy Time

Jobs
Which Is Better For Linux Administrator Job

Linux Interview Questions
Interview Questions
Important Interview Questions with Answers
Further Interview Preparation Questions
Network Administrator Job Interview Questions

Certification
My Linux Certification Experience
Linux Certification Question
Linux Examination Questions
RHCE RHCT Examination Questions
RHCE Questions for Practices
RHCT Certification - Samples For Self Test
Red Hat Certified Technician Questions

Red Hat
Configuration Of DNS In RHEL5
Configure SSH CHROOT on RedHat Enterprise

VNC
Setting Up VNC Server On Ubuntu

IPtables
Auditing Change Settings Iptables

Commands
List of Linux Commands - A to G
List of Linux Commands - H to Q
List of Linux Commands - R to Z
Useful Linux Command Line Q&A
Common Commands - System Info
Basic Operations Commands Often Used
Network Apps Commands
Process Control Command

Shortcuts
Essential Shortcuts and Sanity Commands

Perl
Install of perl module Sendmail Milter in RedHat Linux 7.3
Perl To Recursive Directories And List Out Files

Learning Linux
Navigation
File Management
Mount disks and Drives
Monitoring Your System and System Utilities
Shutting Down, Rebooting Users and Groups
Common DOS to Linux Commands
Permissions With The chmod Command
Important Daemons and Startup Services
Compressing and Archiving files