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(1) Write a DOS-like shell on top of the Bourne shell to satisfy the DOS users. Your program is invoked by and the familiar DOS prompt is displayed which shows the path of the current working directory.
You shell supports the following DOS commands: cd del ren more copy files copy file1 file2 xcopy xcopy/s xcopy /s deltree deltree/y deltree /y dir dir/w dir /w dir/p dir /p If the user command does not match any of the supported DOS commands, you shell should still send it to unix for execution.
(II) Write 2 sh scripts A. 'Makeusers' to create a bunch of user accounts on Linux. Reference to the Linux commands of adduser and useradd. Suppose a list of usernames is supplied in an ascii file 'classlist' as follows: tongf doej billw The script 'makeusers' will read the usernames from the file 'classlist' and create the 3 user accounts accordingly.
The script 'purgeusers' will read the usernames from the file 'classlist' and remove the 3 user accounts and the corresponding dirs and files accordingly.
Determine the various aspects in which we can view an operating system in terms of the services provided also discuss the differences between the various types of the operating systems and what are the advantages and limitations of each type
Discuss how routers and firewalls and IDSs inspect inbound and outbound traffic and explain how we use those features to our benefits in securing the network.
a small CPU with a 10-bit address bus. You need to connect a 64-byte PROM, a 32-byte RAM, and a 4-port I/O chip with two address lines. Chip selects on all chips are asserted high.
Specify the order in which processes execute and determine the mean process turnaround time for each of the scheduling algorithms.
Give an example of a three-process 4 resource system that is in an unsafe state. Explain why it is in an unsafe state. How many more resources would need to be added to make it a safe state?
Discuss briefly the network management software components and describe the elements and capabilities of a fault, configuration, accountingn and security server.
Consider the followimg nested loop contruct. Categorize the efficiency in terms of the variable n using "big-O" notation. Suppose the statements represented by the elipsis
Currently the ATM is idle. Find the probabilities that, in 3 minutes, the ATM will be idle; will be serving one customer with no one in the queue; will be serving one customer with one customer waiting in the queue
A function of n, the number of data items being manipulated. For each expression, determine the dominant term and then classify the algorithm in big-O terms.
Do you consider that standards are beneficial in the field of wireless networking or do you feel they limit new technologies?
1. given the following code and the assembler equivalent to the rightfor i999 igt0 i-- xixiyiloopnbspnbsp
Give a (specific) example for processor scheduling in which preemption helps improve performance. Now discuss the feasibility of designing a preemptive disk scheduling algorithm for a disk read workload in which each job has the same priority. Do ..
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