Computer Science: A Structured Programming Approach Using C, Third Edition
3rd Edition
ISBN: 9780534491321
Author: Behrouz A. Forouzan, Richard F. Gilberg
Publisher: Course Technology, Inc.
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Chapter 4, Problem 32PS
Code and run
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Whentheuserenters!!,themostrecentcommandinthehistoryisexecuted.In the example above, if the user entered the command:
Osh> !!
The ‘ls -l’ command should be executed and echoed on user’s screen. The command should also be placed in the history buffer as the next command.
Whentheuserentersasingle!followedbyanintegerN,theNthcommandin the history is executed. In the example above, if the user entered the command:
Osh> ! 3
The ‘ps’ command should be executed and echoed on the user’s screen. The command should also be placed in the history buffer as the next command.
Error handling:
The program should also manage basic error handling. For example, if there are no commands in the history, entering !! should result in a message “No commands in history.” Also, if there is no command corresponding to the number entered with the single !, the program should output "No such command in history."
Activity No.
Activity
Time (weeks)
Immediate Predecessors
1
Requirements collection
3
2
Requirements structuring
4
1
3
Process analysis
3
2
4
Data analysis
3
2
5
Logical design
50
3,4
6
Physical design
5
5
7
Implementation
6
6
c. Using the information from part b, prepare a network diagram. Identify the critical path.
2. UNIX Shell and History Feature [20 points]
This question consists of designing a C program to serve as a shell interface that
accepts user commands and then executes each command in a separate process. A
shell interface gives the user a prompt, after which the next command is entered.
The example below illustrates the prompt osh> and the user's next command:
cat prog.c. The UNIX/Linux cat command displays the contents of the file
prog.c on the terminal using the UNIX/Linux cat command and your program
needs to do the same.
osh> cat prog.c
The above can be achieved by running your shell interface as a parent process.
Every time a command is entered, you create a child process by using fork(),
which then executes the user's command using one of the system calls in the
exec() family (as described in Chapter 3). A C program that provides the general
operations of a command-line shell can be seen below.
#include
#include
#define MAX LINE 80 /* The maximum length command */
{
int…
Chapter 4 Solutions
Computer Science: A Structured Programming Approach Using C, Third Edition
Ch. 4 - Prob. 1PSCh. 4 - The function definition contains the code for a...Ch. 4 - Function calls that return void may not be used as...Ch. 4 - The address operator (&) is used to tell the...Ch. 4 - Variables defined within a block have global...Ch. 4 - Prob. 6PSCh. 4 - Which of the following statements about function...Ch. 4 - Which of the following is not a part of a function...Ch. 4 - Which of the following statements about function...Ch. 4 - Which of the following statements about local...
Ch. 4 - Prob. 11PSCh. 4 - Prob. 12PSCh. 4 - Which of the following statements will generate a...Ch. 4 - Which of the following statements about structure...Ch. 4 - Find any errors in the following function...Ch. 4 - Find any errors in the following function...Ch. 4 - Find any errors in the following function...Ch. 4 - Find any errors in the following function...Ch. 4 - Find any errors in the following function...Ch. 4 - Find any errors in the following function calls:...Ch. 4 - Evaluate the value of the following expressions:...Ch. 4 - Evaluate the value of the following...Ch. 4 - Prob. 23PSCh. 4 - Define the range of the random numbers generated...Ch. 4 - What would be printed from Program 4-17 when run...Ch. 4 - Prob. 26PSCh. 4 - Prob. 27PSCh. 4 - Prob. 28PSCh. 4 - Prob. 29PSCh. 4 - Write a program that generates a random number...Ch. 4 - Prob. 31PSCh. 4 - Code and run Program 4-16, "Top—down Development...Ch. 4 - Prob. 33PSCh. 4 - Prob. 34PSCh. 4 - Expand the calculator program, Program 4-15, to...Ch. 4 - Prob. 36PSCh. 4 - Write a function that receives a positive...Ch. 4 - Prob. 38PSCh. 4 - Prob. 39PSCh. 4 - Prepare a payroll earnings statement for the sales...Ch. 4 - Write a program that, given a beginning balance in...Ch. 4 - The formula for converting centigrade temperatures...Ch. 4 - Write a program that uses standard functions. The...Ch. 4 - Write a C program that creates customers' bills...
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