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Unix ppt

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this ppt is basics of unix operating system.....

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Unix ppt

  1. 1. Presentation on introduction of UNIX Submitted To: Mr.Nitesh Baghel Miss.Rohini Chouhan Submitted by: Sudhir kumar saurav 0158cs111101
  2. 2. Introduction to Linux UNIX Unix is a multi-user, multi-tasking operating system. You can have many users logged into a system simultaneously, each running many programs. It's the kernel's job to keep each process and user separate and to regulate access to system hardware, including cpu, memory, disk and other I/O devices.
  3. 3. Introduction to Linux HISTORY OF UNIX First Version was created in Bell Labs in 1969. Some of the Bell Labs programmers who had worked on this project, Ken Thompson, Dennis Ritchie, Rudd Canaday, and Doug McIlroy designed and implemented the first version of the Unix File System on a PDP-7 along with a few utilities. It was given the name UNIX by Brian Kernighan. 00:00:00 Hours, Jan 1, 1970 is time zero for UNIX. It is also called as epoch.
  4. 4. Introduction to Linux HISTORY OF UNIX 1973 Unix is re-written mostly in C, a new language developed by Dennis Ritchie. Being written in this high-level language greatly decreased the effort needed to port it to new machines. 1977 There were about 500 Unix sites world-wide. 1980 BSD 4.1 (Berkeley Software Development) 1983 SunOS, BSD 4.2, System V
  5. 5. Introduction to Linux HISTORY OF UNIX 1988 AT&T and Sun Microsystems jointly develop System V Release 4 (SVR4). This later developed into UnixWare and Solaris 2. 1991 Linux was originated.
  6. 6. Introduction to Linux WHAT IS LINUX Linux is a free Unix-type operating system originally created by Linus Torvalds with the assistance of developers around the world. It originated in 1991 as a personal project of Linus Torvalds, a Finnish graduate student. The Kernel version 1.0 was released in 1994 and today the most recent stable version is 2.6.9 Developed under the GNU General Public License , the source code for Linux is freely available to everyone.
  7. 7. Introduction to Linux UNIX STRUCTURE
  8. 8. LINUX FEATURES • UNIX-like operating system. • Features: • Preemptive multitasking. • Virtual memory (protected memory, paging). • Shared libraries. • Demand loading, dynamic kernel modules. • Shared copy-on-write executables. • TCP/IP networking. • SMP support. • Open source.
  9. 9. HISTORY • UNIX: 1969 Thompson & Ritchie AT&T Bell Labs. • BSD: 1978 Berkeley Software Distribution. • Commercial Vendors: Sun, HP, IBM, SGI, DEC. • GNU: 1984 Richard Stallman, FSF. • POSIX: 1986 IEEE Portable Operating System unIX. • Minix: 1987 Andy Tannenbaum. • SVR4: 1989 AT&T and Sun. • Linux: 1991 Linus Torvalds Intel 386 (i386). • Open Source: GPL.
  10. 10. WHAT’S A KERNEL? • AKA: executive, system monitor. • Controls and mediates access to hardware. • Implements and supports fundamental abstractions: • Processes, files, devices etc. • Schedules / allocates system resources: • Memory, CPU, disk, descriptors, etc. • Enforces security and protection. • Responds to user requests for service (system calls). • Etc…etc…
  11. 11. WHERE IS LINUX USED?  75% of respondents were already using Linux and another 14% were evaluating it  43% of all web sites use Linux servers running the Apache Web server
  12. 12. HOW IS LINUX USED?  Personal Workstation  File and Print Server  Internet Service Provider  Three-tier Client/Server  Turnkey System
  13. 13. WHY USE LINUX? • Costs less • Stable • Reliable • Extremely powerful
  14. 14. • Financial Differences • Technical Differences • End-User Differences
  15. 15. LINUX VS. WINDOWS COST LINUX WINDOWS Online Downloads Free Not Available Retail Price, CD $50 $300
  16. 16. Technical Differences
  17. 17. LINUX VS. WINDOWS Keeping up to date By Upgrading Linux upgrades faster than Windows Compatibility Linux is Backward Compatible unlike Windows
  18. 18. LINUX VS. WINDOWS • Application Differences  No commercial word processor for Linux, which matches the quality for Windows
  19. 19. End-User Differences
  20. 20. • Proprietary vs. Open Source  Windows is a Proprietary Technology Applications will only work on Windows  Linux – Open Source
  21. 21. LINUX  Complete information needed for download  Technical help – Available on Internet (user must be comfortable with UNIX system)  Windows word processor is better than Linux
  22. 22. LINUX VS. WINDOWS  Head to head competition  Used side by side as servers  Both handled daily workload for several small business operations  Linux with hardware disadvantage supported a community of users 3 times size of NT’s In The Commercial Arena
  23. 23. CONCLUSION “When is it best to use Linux and when should some other operating system be preferred?”  It all depends on the user.

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