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Unix Presentation

Unix Presentation. What is an Operating System. An operating system (OS) is a program that allows you to interact with the computer -- all of the software and hardware on your computer Basically, there are two ways to interact with the computer 1. command-line

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Unix Presentation

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  1. Unix Presentation

  2. What is an Operating System • An operating system (OS) is a program that allows you to interact with the computer -- all of the software and hardware on your computer • Basically, there are two ways to interact with the computer 1. command-line 2.Graphical User Interface (GUI)

  3. History of Unix • originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie,Brain Kernighan,etc.. • The Unix operating system was first developed in Assembly language, but by 1973 had been almost entirely recoded in C,

  4. Unix Architecture

  5. kernel: The kernel is the heart of the operating system. It interacts with hardware and most of the tasks like memory management, tash scheduling and file management. • Shell: The shell is the utility that processes your requests. When you type in a command at your terminal, the shell interprets the command and calls the program that you want. The shell uses standard syntax for all commands. C Shell, Bourne Shell and Korn Shell are most famous shells which are available with most of the Unix variants.

  6. Shells • An interface between the Linux system and the user • Used to call commands and programs • An interpreter • Powerful programming language • “Shell scripts” = .bat .cmd EXEC REXX • Many available (bsh; ksh; csh; bash; tcsh)

  7. What is Linux In Sept 1991, LinusTorvalds, a second year student of Computer Science at the University of Helsinki, developed the preliminary kernel of Linux, known as Linux version 0.0.1

  8. Linux v/s Unix • UNIX Operating System Names • A few popular names: • HP-UX • IBM AIX • Sun Solairs • Mac OS X • IRIX • Linux Distribution (Operating System) Names • A few popular names: • Redhat Enterprise Linux • Fedora Linux • Debian Linux • Suse Enterprise Linux • Ubuntu Linux

  9. Common Things Between Linux & UNIX • Both share many common applications such as: • GUI, file, and windows managers (KDE, Gnome) • Shells (ksh, csh, bash) • Various office applications such as OpenOffice.org • Development tools (perl, php, python, GNU c/c++ compilers)

  10. root Directories / etc home usr passwd inittab User home directories neale scully marty a b Data files Unix File System Basics • Linux files are stored in a single rooted, hierarchical file system • Data files are stored in directories (folders) • Directories may be nested as deep as needed

  11. / etc home usr passwd inittab /etc/passwd neale scully marty a b /home/neale/b Naming Files • Files are named by • naming each containing directory • starting at the root • This is known as the pathname

  12. Features of Unix • multi-usermore than one user can use the machine at a time supported via terminals (serial or network connection). It does this by time-slicing the computer processor at regular intervals between the various users. • multi-taskingmore than one program can be run at a time • hierarchical directory structureto support the organisation and maintenance of files

  13. Advantages of Unix over Windows • Security UNIX is considered 'more secure' while WINDOWS is considered 'less secure'. • Open Source Linux is an open source we can get over internet. It’s source code is avialable we can change it according to our requirement. • Free of Cost • Free from Virus

  14. Questions???

  15. Thank You

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