This link has been bookmarked by 76 people . It was first bookmarked on 28 Dec 2007, by swan lin.
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05 Jun 17
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when there is no windows interface available, for example, in a telnet session.
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The UNIX operating system is made up of three parts; the kernel, the shell and the programs.
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The kernel of UNIX is the hub of the operating system: it allocates time and memory to programs and handles the filestore and communications in response to system calls
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suppose a user types rm myfile
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searches the filestore for the file containing the program rm
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requests the kernel, through system calls, to execute the program rm on myfile
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The shell acts as an interface between the user and the kernel
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then starts another program called the shell
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The commands are themselves programs: when they terminate
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It interprets the commands the user types in and arranges for them to be carried out
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users can use different shells on the same machine.
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pressing the [Tab] key
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Everything in UNIX is either a file or a process
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A process is an executing program identified by a unique PID (process identifier)
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A file is a collection of data. They are created by users using text editors, running compilers etc
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incomprehensible to a casual user
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comprehensible directly to the machine
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a directory
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The file-system is arranged in a hierarchical structure
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The top of the hierarchy is traditionally called root
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a slash /
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27 Dec 16
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11 May 16
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UNIX is an operating system which was first developed in the 1960s, and has been under constant development ever since. By operating system, we mean the suite of programs which make the computer work. It is a stable, multi-user, multi-tasking system for servers, desktops and laptops.
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Here in the School, we use Solaris on our servers and workstations, and Fedora Linux on the servers and desktop PCs.
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- a document (report, essay etc.)
- the text of a program written in some high-level programming language
- instructions comprehensible directly to the machine and incomprehensible to a casual user, for example, a collection of binary digits (an executable or binary file);
- a directory, containing information about its contents, which may be a mixture of other directories (subdirectories) and ordinary files.
Everything in UNIX is either a file or a process.
A process is an executing program identified by a unique PID (process identifier).
A file is a collection of data. They are created by users using text editors, running compilers etc.
Examples of files:
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09 Jan 16
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15 Jul 15
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03 May 15
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04 Jan 15
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27 Oct 14
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UNIX systems also have a graphical user interface (GUI)
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UNIX systems also have a graphical user interface (GUI)
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UNIX systems also have a graphical user interface (GUI)
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UNIX systems also have a graphical user interface (GUI)
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MacOS X
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GNU/Linux
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Sun Solaris,
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three parts
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the kernel
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the programs
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the shell
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the hub of the operating system
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handles the filestore
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it allocates time and memory to programs
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communications in response to system calls.
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The shell acts as an interface between the user and the kernel
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tcsh shell by default.
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An UNIX Terminal window will then appear with a % prompt
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09 Jun 14
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The most popular varieties of UNIX are Sun Solaris, GNU/Linux, and MacOS X.
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The shell acts as an interface between the user and the kernel.
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Filename Completion - By typing part of the name of a command, filename or directory and pressing the [Tab] key,
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Everything in UNIX is either a file or a process.
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A process
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A file
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24 Feb 14
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05 Dec 13
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29 Oct 13
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17 Sep 13
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three parts; the kernel, the shell and the programs.
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it allocates time and memory to programs and handles the filestore and communications in response to system calls.
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The shell acts as an interface between the user and the kernel.
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It interprets the commands the user types in and arranges for them to be carried out
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Everything in UNIX is either a file or a process.
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The top of
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files are grouped together in the directory structure.
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10 Aug 13
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Everything in UNIX is either a file or a process
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A process is an executing program identified by
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a unique PID (process identifier)
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A file is a collection of data
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26 Oct 12
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20 Oct 12
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28 Sep 12
Vijayendra RadhakrishnaUnix Introduction
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07 Aug 12
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20 Sep 11
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The most popular varieties of UNIX are Sun Solaris, GNU/Linux, and MacOS X.
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The UNIX operating system is made up of three parts; the kernel, the shell and the programs.
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The kernel of UNIX is the hub of the operating system: it allocates time and memory to programs and handles the filestore and communications in response to system calls
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The shell acts as an interface between the user and the kernel.
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Everything in UNIX is either a file or a process.
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30 Aug 11
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21 Jul 11
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23 Jul 10
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25 May 10
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10 May 10
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03 May 10
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26 Apr 09
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UNIX is an operating system
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By operating system, we mean the suite of programs which make the computer work.
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UNIX systems also have a graphical user interface (GUI)
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ifferent versions
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programs
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kernel,
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three parts;
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shell
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hub of the operating system:
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shell and the kernel work together
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shell searches the filestore for the file containing the program rm,
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requests the kernel, through system calls, to execute the program rm on myfile.
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between the user and the kernel.
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interface
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command line interpreter (CLI)
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06 Apr 09
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05 Jan 09
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29 Dec 08
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28 Dec 07
swan linThere are many different versions of UNIX, although they share common
similarities. The most popular varieties of UNIX are Sun Solaris, GNU/Linux, and
MacOS X.-
The UNIX operating system is made up of three parts; the kernel, the shell and the programs.
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The kernel of UNIX is the hub of the operating system: it allocates time and memory to programs and handles the filestore and communications in response to system calls
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The shell acts as an interface between the user and the kernel.
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01 Dec 07
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16 Aug 07
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24 Mar 07
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