Unix and shell programming
... more than one user can use the machine at a time supported via terminals (serial or network connection) multi-tasking, more than one program can be run at a time hierarchical directory structure, to support the organization and maintenance of files ...
... more than one user can use the machine at a time supported via terminals (serial or network connection) multi-tasking, more than one program can be run at a time hierarchical directory structure, to support the organization and maintenance of files ...
Lecture 12: Protection: Kernel and Address Spaces 12.0 Main Points
... sets processor status to kernel changes execution stack to kernel saves current program counter jumps to handler in kernel handler saves previous state of any registers it uses Context switching between programs: same as with threads, except now also save and restore pointer to translation table. To ...
... sets processor status to kernel changes execution stack to kernel saves current program counter jumps to handler in kernel handler saves previous state of any registers it uses Context switching between programs: same as with threads, except now also save and restore pointer to translation table. To ...
Peter Sirokman
... systems designed to be flexible OSKit is a tool for making operating systems OS-s built with OSKit may or may not be microkernel OSKit gives greater flexibility than a microkernel, since even microkernels force some concepts (threads, IPC) onto the overall system ...
... systems designed to be flexible OSKit is a tool for making operating systems OS-s built with OSKit may or may not be microkernel OSKit gives greater flexibility than a microkernel, since even microkernels force some concepts (threads, IPC) onto the overall system ...
Red Hat Linux System Administration I – Concepts
... Counting Words, Lines and Characters Using wc Sorting ‘Rows’ of Records by Any Field Using sort Printing Lines of Files With Specific Strings Within Them Using grep Printing Selected Columns and Fields Using cut Rearranging Columns and Fields Using cut Other String Processing Tools Using join, tee D ...
... Counting Words, Lines and Characters Using wc Sorting ‘Rows’ of Records by Any Field Using sort Printing Lines of Files With Specific Strings Within Them Using grep Printing Selected Columns and Fields Using cut Rearranging Columns and Fields Using cut Other String Processing Tools Using join, tee D ...
No Slide Title - Computer Graphics at Stanford University
... Each device controller has a local buffer. CPU moves data from/to main memory to/from local buffers I/O is from the device to local buffer of controller. Device controller informs CPU that it has finished its operation by causing an interrupt. ...
... Each device controller has a local buffer. CPU moves data from/to main memory to/from local buffers I/O is from the device to local buffer of controller. Device controller informs CPU that it has finished its operation by causing an interrupt. ...
Lecture 11
... While one program is waiting for I/O to take place, another can be using the CPU to execute instructions. Time-slicing: The CPU may be switched rapidly between different programs, executing a few instructions from each, using a periodic clock-generated interrupt. Slow down execution of each progra ...
... While one program is waiting for I/O to take place, another can be using the CPU to execute instructions. Time-slicing: The CPU may be switched rapidly between different programs, executing a few instructions from each, using a periodic clock-generated interrupt. Slow down execution of each progra ...
Slide 1
... While one program is waiting for I/O to take place, another can be using the CPU to execute instructions. Time-slicing: The CPU may be switched rapidly between different programs, executing a few instructions from each, using a periodic clock-generated interrupt. Slow down execution of each progra ...
... While one program is waiting for I/O to take place, another can be using the CPU to execute instructions. Time-slicing: The CPU may be switched rapidly between different programs, executing a few instructions from each, using a periodic clock-generated interrupt. Slow down execution of each progra ...
DOS (“Disk Operating System”)
... print lines matching a pattern kills a running program creates a link between two files; try ln –s list contents of directory; try ls –lisa show library calls made WWW/News/Mail browser shows current processes set/get the value of shell variables transfer files securely to/from a remote machine exec ...
... print lines matching a pattern kills a running program creates a link between two files; try ln –s list contents of directory; try ls –lisa show library calls made WWW/News/Mail browser shows current processes set/get the value of shell variables transfer files securely to/from a remote machine exec ...
UNIX/LINUX
... The kernel is responsible for Input/Output Central Prosessing (the brain) –determines when and how programs run. ...
... The kernel is responsible for Input/Output Central Prosessing (the brain) –determines when and how programs run. ...
Introduction and Overview - William & Mary Computer Science
... • use a hardware timer that generates a periodic interrupt • before it transfers to a user program, the OS loads the timer with a time to interrupt – “quantum” – how big should it be set? ...
... • use a hardware timer that generates a periodic interrupt • before it transfers to a user program, the OS loads the timer with a time to interrupt – “quantum” – how big should it be set? ...
Chapter 4 - Killarney Secondary School
... All files start at the root directory All other directories branch off of the root directory Must know the path to find files in DOS Paths are typed in either relatively or absolute ...
... All files start at the root directory All other directories branch off of the root directory Must know the path to find files in DOS Paths are typed in either relatively or absolute ...
Operating System - GCG-42
... The similar jobs are bunched together and are kept for processing at an later time. ...
... The similar jobs are bunched together and are kept for processing at an later time. ...
Introduction to Database Systems
... It allows the user of computer system to use application software – email, Web, word processors language libraries, system calls Hardware resources which include, keyboard, display, memory, drives and CPU . AUI – application user interface API- application programmers interface ...
... It allows the user of computer system to use application software – email, Web, word processors language libraries, system calls Hardware resources which include, keyboard, display, memory, drives and CPU . AUI – application user interface API- application programmers interface ...
Lecture 1 - Concepts of the UNIX Operating System
... NOTES: 1. Many UNIX commands (called filters) possess an unusual property in that the output of one command can be connected to the input of another. In this way, pipelines of two or more commands can be set up to handle complex text manipulation tasks. You can’t have a pipeline of interactive comma ...
... NOTES: 1. Many UNIX commands (called filters) possess an unusual property in that the output of one command can be connected to the input of another. In this way, pipelines of two or more commands can be set up to handle complex text manipulation tasks. You can’t have a pipeline of interactive comma ...
BIOS (Basic Input Output Service)
... Diskette data area Current video mode Number of screen columns Regen buffer length, in bytes ...
... Diskette data area Current video mode Number of screen columns Regen buffer length, in bytes ...
Operating Systems: Basic Concepts and Challenges against
... very basic service every operating system provides to the users and the programs. Communication: Interaction and message-transfer between programs is required because two different programs running on a computer might require to communicate between them to exchange critical information. Error Detect ...
... very basic service every operating system provides to the users and the programs. Communication: Interaction and message-transfer between programs is required because two different programs running on a computer might require to communicate between them to exchange critical information. Error Detect ...
Operating Systems
... programming tools, text editors, typesetting tools, and graphical user interfaces based on the X windowing system. X is a standard in academic and scientific computing, but not hitherto common on PCs; it's a complex distributed windowing system on which people implement graphical interfaces like KDE ...
... programming tools, text editors, typesetting tools, and graphical user interfaces based on the X windowing system. X is a standard in academic and scientific computing, but not hitherto common on PCs; it's a complex distributed windowing system on which people implement graphical interfaces like KDE ...
Chapter 2
... Protection and security - The owners of information stored in a multiuser or networked computer system may want to control use of that information, concurrent processes should not interfere with each other ...
... Protection and security - The owners of information stored in a multiuser or networked computer system may want to control use of that information, concurrent processes should not interfere with each other ...
2.01
... System Calls It is in user mode when a user program is running (executing) The mode will be changed to kernel mode when the user program ...
... System Calls It is in user mode when a user program is running (executing) The mode will be changed to kernel mode when the user program ...
PPT - CS
... • Processes can be interrupted by interrupts, exceptions or traps. • An interrupt is a signal to the CPU indicating that an event has occurred, and it results in changes in the sequence of instructions that is executed by the CPU. Interrupts are events which aren’t part of the running program’s regu ...
... • Processes can be interrupted by interrupts, exceptions or traps. • An interrupt is a signal to the CPU indicating that an event has occurred, and it results in changes in the sequence of instructions that is executed by the CPU. Interrupts are events which aren’t part of the running program’s regu ...
system call
... As we saw last week in a operating system programs are not allowed direct access to any of the resources except CPU and memory and even then the use has limits placed on it. Thus 1. OS handles requests from programs for various resources to do things e.g. input or output something and enforces the l ...
... As we saw last week in a operating system programs are not allowed direct access to any of the resources except CPU and memory and even then the use has limits placed on it. Thus 1. OS handles requests from programs for various resources to do things e.g. input or output something and enforces the l ...
Device Drivers - EMU CMPE Home Page
... 0th – for Kernel mode parts of OS, and users applications and some parts of OS run on the 3rd ring of privilege. Protected mode provides means for multitasking and segmented and paged virtual memory. Each user task gets 4G bytes of virtual address space. Maximal size of segment is 4Gb, size of page ...
... 0th – for Kernel mode parts of OS, and users applications and some parts of OS run on the 3rd ring of privilege. Protected mode provides means for multitasking and segmented and paged virtual memory. Each user task gets 4G bytes of virtual address space. Maximal size of segment is 4Gb, size of page ...
Chapter 6: Operating Systems: The Genie in the Computer
... components to perform tasks requested by the user. • Allows use of (partial list!) – the keyboard – the mouse – printing to a printer of your choice – viewing information on a monitor – saving or retrieving files – formatting a disk – running programs – controlling any external device attached to th ...
... components to perform tasks requested by the user. • Allows use of (partial list!) – the keyboard – the mouse – printing to a printer of your choice – viewing information on a monitor – saving or retrieving files – formatting a disk – running programs – controlling any external device attached to th ...
Slides - Dr. Choong
... Program : a set of data and code that manipulate it Process : a program in execution States of a Process Running, Waiting, Ready, etc. Process “Tree” ...
... Program : a set of data and code that manipulate it Process : a program in execution States of a Process Running, Waiting, Ready, etc. Process “Tree” ...
Acorn MOS
Acorn's Machine Operating System (MOS) or OS was a computer operating system used in the Acorn BBC computer range. It included support for four-channel sound and graphics, file system abstraction, and digital and analogue I/O including a daisy-chained fast expansion bus. The implementation was single-tasking, monolithic and non-reentrant.Versions 0.10 to 1.20 were used on the BBC Micro, version 1.00 on the Electron, version 2 was used on the B+, and versions 3 to 5 were used in the BBC Master Series range.The final BBC computer, the BBC A3000, was 32-bit and ran RISC OS. Its operating system used portions of the Acorn MOS architecture and shared a number of characteristics (commands, VDU system) with the earlier 8-bit MOS.Versions 0 and 1 of the MOS were 16KiB in size, written in 6502 machine code, and held in ROM on the motherboard. The upper quarter of the 16-bit address space (0xC000 to 0xFFFF) is reserved for its ROM code and I/O space.Versions 2 to 5 were still restricted to a 16KiB address space but managed to hold more code and hence more complex routines, partly because of the alternative 65C102 CPU with its denser instruction set plus the careful use of paging.