File-System
... Name – only information kept in human-readable form Identifier – unique tag (number) identifies file within file ...
... Name – only information kept in human-readable form Identifier – unique tag (number) identifies file within file ...
Plan 9 from Bell Labs
... machines over different networks, but by making the name space equivalent in all win dows, this is transparent: the same commands and resources are available, with the same names, wherever the computation is performed. The command set of Plan 9 is similar to that of UNIX. The commands fall into sev ...
... machines over different networks, but by making the name space equivalent in all win dows, this is transparent: the same commands and resources are available, with the same names, wherever the computation is performed. The command set of Plan 9 is similar to that of UNIX. The commands fall into sev ...
Implementing Processes, Threads, and Resources
... • Secondary storage device contains: – Volume directory (sometimes a root directory for a file system) – External file descriptor for each file ...
... • Secondary storage device contains: – Volume directory (sometimes a root directory for a file system) – External file descriptor for each file ...
Assignment0: Linux Basics and /proc
... collective kernel variables define the kernel's perspective of the state of the entire computer system. Each externally invoked function-a system call or an IRQ-provides a prescribed service and causes the system state to be changed by having the kernel code change its kernel variables. If you could ...
... collective kernel variables define the kernel's perspective of the state of the entire computer system. Each externally invoked function-a system call or an IRQ-provides a prescribed service and causes the system state to be changed by having the kernel code change its kernel variables. If you could ...
Chapter 10 PowerPoint
... interpret its contents. Examples: text, image, executable, etc. • Files have attributes, usually including the following: – Name: human-readable file name – Identifier: numeric identifier within the file system – Type: some systems formally support different file types – Location: address of the fil ...
... interpret its contents. Examples: text, image, executable, etc. • Files have attributes, usually including the following: – Name: human-readable file name – Identifier: numeric identifier within the file system – Type: some systems formally support different file types – Location: address of the fil ...
Introduction to Operating System
... Operating System: Network operating system Allows users to share printer, Internet access, files, and programs on a network Administers security by establishing user name and password for each user ...
... Operating System: Network operating system Allows users to share printer, Internet access, files, and programs on a network Administers security by establishing user name and password for each user ...
Appendix A-Linux_cs3
... Linux Environments The windows, menus, and dialog boxes most people think of as part of the operating system are actually separate layers, known as the windowing system and the desktop environment. These layers provide the human-oriented graphical user interface (GUI) that enables users to easily w ...
... Linux Environments The windows, menus, and dialog boxes most people think of as part of the operating system are actually separate layers, known as the windowing system and the desktop environment. These layers provide the human-oriented graphical user interface (GUI) that enables users to easily w ...
UNIX Notes:
... have POSIX compliant kernels. Popular Linux OS distributions include: Ubuntu, Fedora, Cygwin, UWin, GNU-win, Debian, Redhat, Knoppix, DSL, Gentu, TinyCore, and MSys. Since it started more than 50 years ago, UNIX has grown and changed in a different way from most operating systems. Many early UNIX us ...
... have POSIX compliant kernels. Popular Linux OS distributions include: Ubuntu, Fedora, Cygwin, UWin, GNU-win, Debian, Redhat, Knoppix, DSL, Gentu, TinyCore, and MSys. Since it started more than 50 years ago, UNIX has grown and changed in a different way from most operating systems. Many early UNIX us ...
Transparency in Distributed Systems
... due to heterogeneity of the network components and mainly due to the extensive use of the Internet services. For instance a company may have many branches operating at different geographical locations and may need to interact with all other branches for dayto-day activities. This gives rise to Distr ...
... due to heterogeneity of the network components and mainly due to the extensive use of the Internet services. For instance a company may have many branches operating at different geographical locations and may need to interact with all other branches for dayto-day activities. This gives rise to Distr ...
LEC6-FileSystem
... ° OS provide a way to map files into the address space of a running process; map() and unmap() • No read or write system calls are needed thereafter ...
... ° OS provide a way to map files into the address space of a running process; map() and unmap() • No read or write system calls are needed thereafter ...
Unix Commands
... A Traffic Cop • Controls the resources of the computer, including memory, file storage, and CPU. • Multitasking (the ability for more than one application to “run” at once) is possible on new computers. ...
... A Traffic Cop • Controls the resources of the computer, including memory, file storage, and CPU. • Multitasking (the ability for more than one application to “run” at once) is possible on new computers. ...
CIS 721 - Lecture 1
... system – a collection of programs mostly written in C. • The kernel is loaded into memory when the system is booted. ...
... system – a collection of programs mostly written in C. • The kernel is loaded into memory when the system is booted. ...
Introduction - Computer Science
... • Separation of user/kernel mode is used for: – Security: The OS calls in kernel mode make sure that the user has enough privileges to run that call. – Robustness: If a process that tries to write to an invalid memory location, the OS will kill the program, but the OS continues to run. A crash in th ...
... • Separation of user/kernel mode is used for: – Security: The OS calls in kernel mode make sure that the user has enough privileges to run that call. – Robustness: If a process that tries to write to an invalid memory location, the OS will kill the program, but the OS continues to run. A crash in th ...
Solution to Lab Project 2.1
... and their contents. It also is faster than the COPY command, because it uses memory better. ...
... and their contents. It also is faster than the COPY command, because it uses memory better. ...
Lecture 5
... Must ensure that a user program could never gain control of the computer in monitor mode (I.e., a user program that, as part of its execution, stores a new address in the interrupt ...
... Must ensure that a user program could never gain control of the computer in monitor mode (I.e., a user program that, as part of its execution, stores a new address in the interrupt ...
Operating System Security
... Functions of Operating System Is a mediator between user applications and hardware Handles lot many complex tasks ...
... Functions of Operating System Is a mediator between user applications and hardware Handles lot many complex tasks ...
Computer Science - Rainhill High School
... graphical and command line methods for managing files and folders Understand the link between the GUI and the text-based commands that execute within an operating system Suggest situations where the command line would be preferable to a GUI for file manipulation ...
... graphical and command line methods for managing files and folders Understand the link between the GUI and the text-based commands that execute within an operating system Suggest situations where the command line would be preferable to a GUI for file manipulation ...
Operating System Services
... May occur in the CPU and memory hardware, in I/O devices, in user program ...
... May occur in the CPU and memory hardware, in I/O devices, in user program ...
BAB 8 SISTEM PENGOPERASIAN
... Unix related systems use very sophisticated memory management algorithms to make efficient use of memory resources. There are three different kinds of memory, three different ways they can be used by the operating system, and three different ways they can be used by processes. ...
... Unix related systems use very sophisticated memory management algorithms to make efficient use of memory resources. There are three different kinds of memory, three different ways they can be used by the operating system, and three different ways they can be used by processes. ...
Into to Linux Part 1-4
... – Runs on many computer "servers“, has ability to provide multi-user, multi-tasking environment – Orchestrates the various parts of the computer: the processor, the on-board memory, the disk drives, keyboards, video monitors, etc. to perform useful tasks ...
... – Runs on many computer "servers“, has ability to provide multi-user, multi-tasking environment – Orchestrates the various parts of the computer: the processor, the on-board memory, the disk drives, keyboards, video monitors, etc. to perform useful tasks ...
PPT - CS
... The main OS file tables • The i-node table - each file may appear at most once in this table. • The open files table – an entry in this table is allocated every time a file is opened. Each entry contains a pointer to the inode table and a position within the file. There can be multiple open file en ...
... The main OS file tables • The i-node table - each file may appear at most once in this table. • The open files table – an entry in this table is allocated every time a file is opened. Each entry contains a pointer to the inode table and a position within the file. There can be multiple open file en ...