Pearson eText for C Programming Language -- Instant Access (Pearson+)
2nd Edition
ISBN: 9780137460847
Author: Dennis Ritchie, Brian Kernighan
Publisher: PEARSON+
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Textbook Question
Chapter 1, Problem 19E
Write a function reverse(s) that reverses the character string s. Use it to write a
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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 1 Solutions
Pearson eText for C Programming Language -- Instant Access (Pearson+)
Ch. 1 - Run the hello, world program on your system....Ch. 1 - Prob. 2ECh. 1 - Modify the temperature conversion program to print...Ch. 1 - Write a program to print the corresponding Celsius...Ch. 1 - Prob. 5ECh. 1 - Prob. 6ECh. 1 - Write a program to print the value of EOF.Ch. 1 - Write a program to count blanks, tabs and...Ch. 1 - Write a program to copy its input to its output,...Ch. 1 - Write a program to copy its input to its output,...
Ch. 1 - Prob. 11ECh. 1 - Write a program that prints its input one word per...Ch. 1 - Write a program to print a histogram of the...Ch. 1 - Write a program to print a histogram of the...Ch. 1 - Rewrite the temperature conversion program of...Ch. 1 - Revise the main routine of the longest-line...Ch. 1 - Write a program to print all input lines that are...Ch. 1 - Write a program to remove trailing blanks and tabs...Ch. 1 - Write a function reverse(s) that reverses the...Ch. 1 - Write a program detab that replaces tabs in the...Ch. 1 - Write a program entab that replaces strings of...Ch. 1 - Write a program to fold long input lines into two...Ch. 1 - Prob. 23ECh. 1 - Write a program to check a C program for...
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