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

• Introduction to UNIX
• Why use Unix
• Basic Unix Commands
• An Intro to vi editor
• Explain Any Two Text Editors in Detail
• Best Unix To Learn For Beginner
• Explain the difference between Linux and UNIX
• History of Unix Operating System
• System Structure of Unix System
• High Level Features of Unix System
• Unix Features and Advantages
• About The Unix Processes

• awk one-liner Tips
• Stream - Oriented Editor One-liner Tips
• Program Performance Optimization
• Sun Solaris Command Tips
• Intro to UNIX Shells
• Undertanding File Permissions on a Unix-Based Server
• How To Mirror Raid5
• Ways of System Logging and Auditing

• RAID (Redundant Array of Inexpensive/Independent Disks)
• Adding a secondary disk to Sun system
• How To Create Unformatted Partition
• Replacing a Rootdisk That Is Failing

• IPTables To Block Port

• What is a semaphore
• What is a thread
• How do I perform arithmetic on floating point numbers

Digital UNIX Tru64

• Account Manager locked by another user
• Digital UNIX to print to an ip-address, socket number?
• Startup scripts configuration parameters
• Shutting down and rebooting a Digital server

• Script To Continue To The Next File
• Sorting Files in Different Directories
• Deleting Files On List Of Folders
• Search Many Files and Print
• Finding Out The Last Modified Time For Files
• Unix Commands for Finding Files
• Show Difference Between Two Files
• Displaying Tabs In A File
• Check and Repair Filesystem with fsck
• To Make Sure All Names Are Lowercase
• Gzip More Than One File and Deleting First Line
• Redirecting Output To File
• Writing File Moving Script
• Check For Zero Byte File Script
• Change Last Modified Accessed Time
• How To Write A Makefile
• The File Subsystem
• Unix File System and Directory Structure
• Find Files Accessed in Last 30 Days
• Filename with Slash
• Advantage of Creating Links to a File

• About Directories
• Copy an Existing Directory Structure
• Check If the Directory Folder Is Empty
• Create Directory Structures

• Managing Your Own Files and Directories
• Printing Command To Be Used
• Man Command To Find The Man Page
• Using The ps And top Commands

• Clusterit To Manage Multiple Servers
• Resize A Konsole Window

• Kmalloc And Malloc Memory Allocation

• Increasing The Password Length
• Modify Etc Password File
• Rlogin To Unix Without Password
• Characteristics of Good Password

• How To Improve Unix Password Security
• Protect Superuser Access

• Unix Command To Find All Users
• Stopping a UNIX machine

• HP UX Startup Script

• SCO Unix Root Password
• SCO Performance Monitoring
• Shutting down and rebooting a SCO server
• Show hardware specifications on a SCO server

• Printing with awk Utility
• Combine Multiple AWK Commands

• Difference Between SC And LOM
• Differences Between Interrupt and Exception

• Write a Script That Monitors The Used Diskspace
• How To Make A Start And Stop Script
• Rename a File If It Exceeds 1 MB In Size
• Not Found Message In Script Execution
• Shell Variables
• How to use Perl in a Shell Script
• Escape Characters in File Named
• Script Before AIX Lock User Account
• Starting a Timer To Count a Period
• To Display The Shell Type
• Redirections Of Shell Input And Output
• Shell Script For Deleting Files
• Wrapper Scripts And Its Uses
• Script Daemon to Listen On a Port
• Shell Script That Check Reports Login Logout
• To Accept a Number and a Word

• Why Require System Administration
• The Building Block Primitives
• Frequently Asked Questions
• Unix Questions and Answers
• Short Questions with Answers
• Important Questions and Answers for Unix
• Commonly Asked Questions
• Sample Questions
• Braindumps Questions and Answers
• What is deadlock

Job Interview Questions

• Unix Administrator Career Path
• Interview Questions with Answers
• Technical Interview - Preparation Questions
• Network Administrator - Job Interview Questions
• Job Questions Asked During My Interview
• Shell Scripting Interview Questions
• Administration Interview Questions
• System Admin Interview Questions
• Commands Interview Questions And Answers

• Self Test Questions for Understanding Unix
• Self Testing Knowledge
• Short Self-Test Questions on Unix
• Self Test Questions Answers on Unix #1

• Specify Subject Line With Sendmail

• How To Login Automatically To Ftp

• Explain Service Provided by Kernel
• Block Diagram of System Kernel
• Process Control Subsystem
• Process State Transition
• User and Kernel Stack for Copy Program

• Steps That a Shell Follows While Processing a Command
• The Shell Script Language
• Invoking Shell Scripts
• Reading from Keyboard Shell Script
• Last Argument in a Bourne Shell Script
• Interactive Shell or Top Level Shell

• Getting Help In Unix
• Running Kernel and System Information
• Load,  Statistics, Messages and Users
• Frequently used Command
• Wild Card and Print a file Commands
• For Processes Commands
• Using The Tail Command
• Sed Command Using Variables
• Basic Administration Commands - Basic Objects
• The Sniff Commands
• The File Compression Commands
• File Analysing Commands
• Check System Resources
• Managing Groups
• When and How to Use chkrootkit
• While Loop Unix Change Status Inactive
• The Chroot Command

• Having a Dot in Your Path
• Breaking a String into Four Different Numbers
• Finding a String
• Printing String Backward
• Scripting String Parsing
• Assigning UNIX commands to Function Keys
• A FIND and GREP Combination
• AWK Quick Columns
• How to use if/else logic in sed/awk
• Alternative to CP
• Automatic Exit after PL/SQL Script
• BASH Hotkeys
• Unix Redirection and Pipes
• Changing PERMS Recursively
• Change/Check your Term Type Quick
• Check if the web server is running without a browser
• Check System Kernel Variables
• Checking your RAM (Solaris)
• CHOWN and Solaris
• UNIX Commands Cheat Sheet
• Cleaning Directories
• Configure Network Card Capability
• Configure the System to Boot a 32-Bit Kernel
• UNIX Permissions
• Find and Edit Command in One
• Find the Hog
• Find the Speed of a Network Card