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A Unix shell is a shell or command-line interpreter that gives a traditional user interface for the Unix-likesystems and for Unix operating system. Users operates the operation of the computer by entering instructions as text for a command line interpreter to run or by creating text scripts of one or more such instructions.
The most influential Unix shells have been the C shell and the Bourne shell. The Bourne shell, sh, was prepared by Stephen Bourne at AT&T as the general Unix command line interpreter; it produced the basic features common to all the Unix shells, adding piping, here documents, variables, command substitution, control structures for condition-testing and filename wildcarding and looping. The language, adding the use of a declared keyword to use the end of a block, was added by ALGOL 68.
Q. What is the use of the command interpreter? Why is it generally separate from the kernel? Answer: It reads commands from the user or else from a file of commands and execu
When you run a program on your UNIX system, the system prepares a special environment for that program. This environment owns everything needed for the system to execute the progra
Explain the basic method of paging method. Physical memory is divided into the fixed-sized blocks called frames. Logical memory is as well divided into blocks of the same size
Explain the Communications of Request or Response Interface The inter-application communication must provide four specific interface to the CSInterface() components. A client m
How does a program execution take place in multiprogramming? While the processor is dealing with a number of programs, the sequence with which programs are implemented will de
Locality of reference entails that the page reference being made by a process Locality of reference entails that the page reference being made by a process is similarly to be
Define what is Dispatcher In the Worker Model, it is the task of the Dispatcher to spawn a thread for every client-to-server connection. The Dispatcher acts as the go-between o
Q. What are two dreadful problems that designers should solve to implement a network-transparent system? Answer: One such issue is making all the processors as well as storag
What is the hardware support required to implement paging? Each operating system has its own techniques for storing page tables. The majority allocates a page table for each pr
The swapper work s on the biggest scheduling priority. Initially it will look for any sleeping process, if not get then it will see for the ready-to-run process for swapping. Bu
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