Unix/Linux Tutorials

Unix/Linux Tutorials Overview

Welcome to Unix/Linux Tutorials by Linux Experts. The objective of these tutorials is to provide in depth understanding of Linux Operating System. In these tutorials, we will cover topics such as Architecture, OS Commands, Vi Editor and File Permissions. We will also cover advanced topics such as Scheduling Jobs, User Administration, Disk Partitioning, Package Management and Troubleshooting of common issues.

In addition to the free linux tutorials, we will also cover common interview questions, issues and how to’s of linux operating system.

Index

Introduction to UNIX

  • UNIX is a CUI Operating system.
  • LINUX is not just for UNIX wizards. LINUX is a clone of O/S.
  • Linux is the most important achievement of free soft ware, it has been developed for business, education & personal productivity.
  • Everyone has to start somewhere, and linux administrators and engineers are no exception. Of you have purchased this book, I imagine that your goal is to pass the Red Hat exams (RHCSA & RHCE) while acquiring or improving your current linux skills.
  • These Linux skills and commands are all essential for knowing how to work with linux, not just Red Hat.

Operating System(O/S)

  • Operating system is a interface between user & computer (or) it is a system software.
  • The operating system is the most important program that runs on a computer. Every general-purpose computer must have an operating system to run other programs.
  • Operating systems perform basis tasks, such as recognizing input from the keyboard, sending out put to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers.
  • It is classified into two types.

2

  1. Single user systems; Provides a platform for only one user at a time. They are popularly associated with Desk Top operating System which run on standalone systems where no user accounts are required.
    1. Example: DOS
  2. Multi User Systems: More than one user can access same system resources (CPU, applications, memory, printers ………etc) at the same time known as multiuse.
    1. Example: UNIX, LINUX
Desired to gain proficiency on LINUX? Explore the blog post on 
LINUX training online to become a pro in LINUX.

Feature of Linux

A). Multiuser: A multi-user Operating system allows more than one user to share the same computer system at the same time.

B). Multi Tasking: More than one program can be run at a time. The main concept of multitasking is maximum utilizing CPU resources

C). Open System: The UNIX is open source code i.e Any user can modified Unix open source code according there ideas and requirements

  • Using UNIX open source codeSun Micro Systems+ Adding additional features =Sun SalariesIBM+Adding additional feature  =  IBM-AIXHP+Adding additional feature= HP=UXSunta Curuz + Adding additional feature= SCO-UnixSilicon Graphics   +Adding additional feature=   IRIXMicro Soft+Adding additional feature  =    xenix
  • Any operating system developed based on UNIX open source code known as flavors of UNIX
  • The Linux was given to GPL (General Public License) Organized by GNU.
  • Linux Torvalds, who was then a student at the university of Helsinki in fin land, developed Linux in 1991. Linux is also open system

Distributors of Linux

  • Red Hat
  • Suse
  • Ubuntu
  • Puppy
  • Slakware
  • Centos
  • OEL
  • Fedora
  • White box
  • Mandrake

D). Security: One of the most valued advantages of linux over the other plat forms lies with the high security levels it ensures. Every linux user is happy to work in a virus-Free environment and use the regular virus – prevention time needed when working with other operating systems for other more important task.

–> UNIX/LINUX has given two levels of securities.

  1. System level Security:  Its controlled by system Administrator.
  2. File level Security:  Its controlled by owner of the file.

E). Portability: Portability means Independent of hardware & processors

F). Communication: The main concept of communication facility Exchanging of information or files form one user account to other user account.

G). Programming Facility: UNIX o/s provides shell. Shell works like a programming language. It provides commands and keywords.

Script LanguageProgramming Language
It is an interpreter based language.Compiler based language
Interpreter Converts high levelThe whole program in a single short into machine language.
Doesn’t create .exe filesCreate .exe files
No need to compile the program.Need to compile the program
It takes less lines of codeTakes numerous lines of code.
Reduces cost of maintenanceIncreases cost of maintenance.

H). Help facility : It is the beautiful feature of UNIX/ LINUX Operating systems. Don’t know the information  about given command just go through the help line.

Example:                    

#Man <command name>

(or)

                                    #info <Command name>

(or)

#<command name> –help

For indepth understanding of Linux click on

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