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Chapter 1: Introduction to Linux. Introduction. Computer Components: Hardware Software Types of hardware and software Important components of an OS are: User Interface Device drivers What is the function of an OS?. The Place of OS. An OS provides an interface to the H/W. OS (cont.).

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introduction
Introduction
  • Computer Components:
    • Hardware
    • Software
  • Types of hardware and software
  • Important components of an OS are:
    • User Interface
    • Device drivers
  • What is the function of an OS?
slide3

The Place of OS

  • An OS provides an interface to the H/W
slide4

OS (cont.)

  • OS also provides GUI and system services such as Network access and Print & File services.
slide5

The Linux OS

  • Still, what is the main function?

Managing resources

  • Resources include (processors, MM, I/O, users, etc.)
  • Some operating systems are multitasking multiuser ones!
  • What is Linux? How do you pronounce it?
  • Almost all Linux versions have a common core component called the Kernel
slide6

The Linux OS (cont.)

  • It is a Unix-like operating system written in C by Linus Torvalds in 1991.
  • It was a trial to improve MINIX (a reduced version of Unix developed by Tanenbaum)
  • Linux was distributed as OSS (Open Source Software), you can modify the code (if you are willing to do so!!)
  • Advantages of OSS: Rapid development, Rapid bug fix, evolving features, etc.)
slide7

Linux Versions

  • Major, minor, & revision numbers
  • Minor (odd development & even production)
slide8

Types of S/W licenses

  • GPL: Source code must be freely available
  • Artistic license: OSS that allow source code to be changed only at author discretion
slide9

Linux Advantages

  • Risk Reduction
  • Meeting Business Needs
  • Stability and Security
  • Available for Different Hardware Platforms
  • Ease of Customization
  • Ease of Obtaining Support (FAQ, HOWTO, LUG, etc.)
  • Cost Reduction
slide10

More History

  • Unix is the first multitasking, multiuser OS
  • What happened to Unix?
  • Current versions (Solaris, HP-UX, IBM’s AIX, etc.)
slide11

More on Linux

  • Famous distributions (Red Hat, SuSE, etc.)
  • GUI Components
    • X-Windows
    • Window manager
    • Desktop environment (KDE & GNOME)
  • Common uses:
    • Servers
    • Workstations (Scientific/Engineering and office applications)
slide12

More on Linux (cont.)

  • Linux also support multitude of servers:
    • Web server (CGI)
    • Mail server
    • Router
    • FTP
    • Firewall and proxy servers
    • News server (Forums)
    • DNS server (FQDN)
    • File and Print servers (light-weight)
    • Application server with DBMS and supercomputers (clustering)