UNIX Introduction

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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.
Desired to gain proficiency on Linux ? Explore the blog post on Linux training to become a pro in Linux.

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.


  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

For indepth understanding of Linux click on

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