EBK C HOW TO PROGRAM
8th Edition
ISBN: 9780133964639
Author: Deitel
Publisher: PEARSON CUSTOM PUB.(CONSIGNMENT)
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Textbook Question
Chapter 5, Problem 5.46E
Find the error in each of the following
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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 5 Solutions
EBK C HOW TO PROGRAM
Ch. 5 - Show the value of x after each of the following...Ch. 5 - (Parking Charges) A parking garage charges a $2.00...Ch. 5 - (Rounding Numbers) An application of function...Ch. 5 - (Rounding Numbers) Function floor may be used to...Ch. 5 - Write statements that assign random integers to...Ch. 5 - For each of the following sets of integers, write...Ch. 5 - (Hypotenuse Calculations) Define a function called...Ch. 5 - (Exponentiation) Write a function...Ch. 5 - Prob. 5.17ECh. 5 - Prob. 5.18E
Ch. 5 - Prob. 5.19ECh. 5 - (Displaying a Square of Any Character) Modify the...Ch. 5 - Prob. 5.21ECh. 5 - (Separating Digits) Write program segments that...Ch. 5 - (Time in Seconds) Write a function that takes the...Ch. 5 - (Temperature Conversions) Implement the following...Ch. 5 - (Find the Minimum) Write a function that returns...Ch. 5 - (Perfect Numbers) An integer number is said to be...Ch. 5 - Prob. 5.27ECh. 5 - (Reversing Digits) Write a function that takes an...Ch. 5 - (Greatest Common Divisor) The greatest common...Ch. 5 - (Quality Points for Students Grades) Write a...Ch. 5 - (Coin Tossing) Write a program that simulates coin...Ch. 5 - (Guess the Number) Write a C program that plays...Ch. 5 - (Guess the Number Modification) Modify the program...Ch. 5 - (Recursive Exponentiation) Write a recursive...Ch. 5 - (Fibonacci) The Fibonacci series 0, 1, 1, 2, 3, 5,...Ch. 5 - (Towers of Hanoi) Every budding computer scientist...Ch. 5 - Prob. 5.37ECh. 5 - Prob. 5.38ECh. 5 - Prob. 5.39ECh. 5 - Prob. 5.40ECh. 5 - (Distance Between Points) Write a function...Ch. 5 - Prob. 5.42ECh. 5 - Prob. 5.43ECh. 5 - After you determine what the program of Exercise...Ch. 5 - (Testing Math Library Functions) Write a program...Ch. 5 - Find the error in each of the following program...Ch. 5 - Prob. 5.47ECh. 5 - (Research Project: 1m proving the Recursive...Ch. 5 - (Global Warming Facts Quiz) The controversial...Ch. 5 - Prob. 5.50MDCh. 5 - Prob. 5.51MDCh. 5 - (Computer-Assisted Instruction: Monitoring Student...Ch. 5 - (Computer-Assisted Instruction: Difficulty Levels)...Ch. 5 - (Computer-Assisted Instruction: Varying the Types...
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