Operating Systems EDA092, DIT400 Why study Operating Systems
... What does an Operating System do: ...
... What does an Operating System do: ...
Intro to UNIX - Regis University: Academic Web Server for Faculty
... • An operating system is a control program that allocates the computer's resources, schedules tasks, and helps the user communicate with the computer. • Most popular PC operating systems: Windows 95/98/2000/XP -- proprietary, single-user OS • UNIX was developed long before Windows, about 30 years ag ...
... • An operating system is a control program that allocates the computer's resources, schedules tasks, and helps the user communicate with the computer. • Most popular PC operating systems: Windows 95/98/2000/XP -- proprietary, single-user OS • UNIX was developed long before Windows, about 30 years ag ...
fund8que.doc
... __13. A device driver is a program that tells the operating system how to communicate with a device. __14. Windows 95 did not require DOS to run. __15. UNIX commands may be considered somewhat difficult to remember and use. ...
... __13. A device driver is a program that tells the operating system how to communicate with a device. __14. Windows 95 did not require DOS to run. __15. UNIX commands may be considered somewhat difficult to remember and use. ...
Computer Science 101
... – Many programs can be stored in memory – Allows programmer to enter system commands, programs, and data online – Allows multiple programmers to run programs simultaneously on one computer (time sharing) ...
... – Many programs can be stored in memory – Allows programmer to enter system commands, programs, and data online – Allows multiple programmers to run programs simultaneously on one computer (time sharing) ...
Overview and History
... Linux kernel is original, but full system incorporates existing UNIX software uses many tools developed as part of Berkeley’s BSD operating system, MIT’s X Window System, and the Free Software Foundation's GNU project Linux kernel is distributed under the GNU General Public License (GPL): free t ...
... Linux kernel is original, but full system incorporates existing UNIX software uses many tools developed as part of Berkeley’s BSD operating system, MIT’s X Window System, and the Free Software Foundation's GNU project Linux kernel is distributed under the GNU General Public License (GPL): free t ...
Computers: Tools for an Information Age
... Describe the methods of resource allocation on large computers Describe the differences among multiprocessing, multiprogramming, and time-sharing Explain the principles of memory management List several functions that are typically performed by utility programs ...
... Describe the methods of resource allocation on large computers Describe the differences among multiprocessing, multiprogramming, and time-sharing Explain the principles of memory management List several functions that are typically performed by utility programs ...
lecture notes
... Inter-Process Communications (IPC) ▪ Processes exchange information via shared memory, message passing, sockets, pipes, files, etc. ▪ Often spans multiple computers and networks Error detection and recovery ▪ Detect errors in CPU, memory, I/O devices, processes, network connections, etc. ▪ Recov ...
... Inter-Process Communications (IPC) ▪ Processes exchange information via shared memory, message passing, sockets, pipes, files, etc. ▪ Often spans multiple computers and networks Error detection and recovery ▪ Detect errors in CPU, memory, I/O devices, processes, network connections, etc. ▪ Recov ...
Operating System Services
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources - Some (such as CPU cycles, main ...
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources - Some (such as CPU cycles, main ...
installing debian
... the different *.if files, and collect them on fafner, and create a file will provide with a zone that will name in the itr3.openlib.org domain, as host.itr3.openlib.org ...
... the different *.if files, and collect them on fafner, and create a file will provide with a zone that will name in the itr3.openlib.org domain, as host.itr3.openlib.org ...
Operating Systems
... • You accidently erased a file you need • The computer was stolen or lost or destroyed • The hardware (hard drive, SSD, etc.) failed and the data is inaccessible or corrupted • There are companies which specialize in recovering data from devices – they are not always successful and they are always c ...
... • You accidently erased a file you need • The computer was stolen or lost or destroyed • The hardware (hard drive, SSD, etc.) failed and the data is inaccessible or corrupted • There are companies which specialize in recovering data from devices – they are not always successful and they are always c ...
Document
... -Ctrl-q – it continues displaying on the screen (stopped with Ctrl-s) -Ctrl-c – it stops the current activity and it is used to stop processes and displays on the screen. -Ctrl-d – means the end of file or exit, used to get out of some Unix utilities, exit from a terminal window or for logout. -Ctrl ...
... -Ctrl-q – it continues displaying on the screen (stopped with Ctrl-s) -Ctrl-c – it stops the current activity and it is used to stop processes and displays on the screen. -Ctrl-d – means the end of file or exit, used to get out of some Unix utilities, exit from a terminal window or for logout. -Ctrl ...
操作系统
... 1. Windows temporarily keeps deleted files in Recycle Bin, while Linux rm delete them instantly. 2. Windows task manager allows us to kill processes with their program names, while Linux uses IDs to kill specific processes. 3. Windows starts an appropriate application for a file double-clicked, whil ...
... 1. Windows temporarily keeps deleted files in Recycle Bin, while Linux rm delete them instantly. 2. Windows task manager allows us to kill processes with their program names, while Linux uses IDs to kill specific processes. 3. Windows starts an appropriate application for a file double-clicked, whil ...
Operating System Structures
... Shell executes fork() system call to create process, then calls exec() to load program into process ...
... Shell executes fork() system call to create process, then calls exec() to load program into process ...
virtual machine
... • Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing – Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them – Accounting - To keep track of which users use how much ...
... • Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing – Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them – Accounting - To keep track of which users use how much ...
General overview of the System
... • UNIX operating system is popular from its beginning (from 1969), running on machines of varying processing power from microprocessor to mainframes and providing a common execution environment across them. ...
... • UNIX operating system is popular from its beginning (from 1969), running on machines of varying processing power from microprocessor to mainframes and providing a common execution environment across them. ...
Basic System Administration
... – a program loaded into memory during the boot process, and always stays in physical memory. – responsible for managing CPU and memory for processes, managing file systems, and interacting with devices. – The Operating System – Microkernel architecture, HAL ...
... – a program loaded into memory during the boot process, and always stays in physical memory. – responsible for managing CPU and memory for processes, managing file systems, and interacting with devices. – The Operating System – Microkernel architecture, HAL ...
Operating Systems CMPSC 473
... – E.g., OS protects access to disk via protecting access to file abstraction ...
... – E.g., OS protects access to disk via protecting access to file abstraction ...
![[Lecture 1, part 3] Kernel interaction with the hardware: Interrupt](http://s1.studyres.com/store/data/014183875_1-7af0f6b03bedcfbf8972c6054b446a98-300x300.png)
[Lecture 1, part 3] Kernel interaction with the hardware: Interrupt
... [Lecture 1, part 3] Kernel interaction with the hardware: Interrupt: Like input / output, user input, between kernel and device driver. Devices call back by interrupts. They are serviced immediately. And they are user transparent. Implementation: Each device only has limited number of interrupt even ...
... [Lecture 1, part 3] Kernel interaction with the hardware: Interrupt: Like input / output, user input, between kernel and device driver. Devices call back by interrupts. They are serviced immediately. And they are user transparent. Implementation: Each device only has limited number of interrupt even ...
IOS101
... Single-User Multi-process Allows one user at a time Allows multiple processes to run simultaneously E.g. OS/2, Win95/98, WinNT workstation ...
... Single-User Multi-process Allows one user at a time Allows multiple processes to run simultaneously E.g. OS/2, Win95/98, WinNT workstation ...
Work with Files and Directories
... • Till UNIX came on scene, operating systems were designed with a particular machine in mind. Programs designed for one system simply wouldn’t run on another. • Ken Thompson and Dennis Ritchie designed and built a small system having an elegant file system, a command interpreter (the shell) and a se ...
... • Till UNIX came on scene, operating systems were designed with a particular machine in mind. Programs designed for one system simply wouldn’t run on another. • Ken Thompson and Dennis Ritchie designed and built a small system having an elegant file system, a command interpreter (the shell) and a se ...
Introduction - Faruk Hadziomerovic
... Unix does not allow device to be specified by drive name (like DOS example A: etc.). MOUNT system call inserts I/O device files into any regular directory. I/O devices look like special files kept in /dev directory (example: /dev/lp). ...
... Unix does not allow device to be specified by drive name (like DOS example A: etc.). MOUNT system call inserts I/O device files into any regular directory. I/O devices look like special files kept in /dev directory (example: /dev/lp). ...
390aLecture01_12wi
... • key features of Linux: open source software: source can be downloaded free to use constantly being improved/updated by the community ...
... • key features of Linux: open source software: source can be downloaded free to use constantly being improved/updated by the community ...
slides - CSE Home
... • key features of Linux: open source software: source can be downloaded free to use constantly being improved/updated by the community ...
... • key features of Linux: open source software: source can be downloaded free to use constantly being improved/updated by the community ...
390Lecture1
... • key features of Linux: open source software: source can be downloaded free to use constantly being improved/updated by the community ...
... • key features of Linux: open source software: source can be downloaded free to use constantly being improved/updated by the community ...
Plan 9 from Bell Labs
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Plan 9 from Bell Labs is a distributed operating system, originally developed by the Computing Sciences Research Center at Bell Labs between the mid-1980s and 2002. It takes some of the principles of Unix, developed in the same research group, but extends these to a networked environment with graphics terminals.In Plan 9, virtually all computing resources, including files, network connections, and peripheral devices, are represented through the file system rather than specialized interfaces. A unified network protocol called 9P ties a network of computers running Plan 9 together, allowing them to share all resources so represented.The name Plan 9 from Bell Labs is a reference to the Ed Wood 1959 cult science fiction Z-movie Plan 9 from Outer Space. Also, Glenda, the Plan 9 Bunny, is presumably a reference to Wood's film Glen or Glenda. The system continues to be used and developed by operating system researchers and hobbyists.