Starting Out with Java: Early Objects (6th Edition)
6th Edition
ISBN: 9780134462011
Author: Tony Gaddis
Publisher: PEARSON
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Chapter 1, Problem 9SA
What is an
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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
Starting Out with Java: Early Objects (6th Edition)
Ch. 1.3 - Why is the computer used by so many different...Ch. 1.3 - List the five major hardware components of a...Ch. 1.3 - Internally, the CPU consists of what two units?Ch. 1.3 - Prob. 1.4CPCh. 1.3 - Prob. 1.5CPCh. 1.3 - Prob. 1.6CPCh. 1.3 - What does the term multitasking mean?Ch. 1.5 - Describe the difference between a key word and a...Ch. 1.5 - Prob. 1.9CPCh. 1.5 - Describe the difference between a program line and...
Ch. 1.5 - Prob. 1.11CPCh. 1.5 - What happens to a variables current contents when...Ch. 1.5 - What is a compiler?Ch. 1.5 - Prob. 1.14CPCh. 1.5 - What is byte code?Ch. 1.5 - Prob. 1.16CPCh. 1.6 - What four items should you identify when defining...Ch. 1.6 - Prob. 1.18CPCh. 1.6 - What is pseudocode?Ch. 1.6 - Describe what a compiler does with a programs...Ch. 1.6 - Prob. 1.21CPCh. 1.6 - Is a syntax error (such as misspelling a key word)...Ch. 1.6 - What is the purpose of testing a program with...Ch. 1.7 - Prob. 1.24CPCh. 1.7 - Prob. 1.25CPCh. 1.7 - Prob. 1.26CPCh. 1.7 - Prob. 1.27CPCh. 1.7 - Prob. 1.28CPCh. 1 - Prob. 1MCCh. 1 - A byte is made up of eight a. CPUs b. addresses c....Ch. 1 - Each byte is assigned a unique a. address b. CPU...Ch. 1 - Prob. 4MCCh. 1 - If you were to look at a machine language program,...Ch. 1 - These are words that have a special meaning in the...Ch. 1 - These are symbols or words that perform operations...Ch. 1 - These characters serve specific purposes, such as...Ch. 1 - These are words or names that are used to identify...Ch. 1 - Prob. 10MCCh. 1 - Prob. 11MCCh. 1 - Prob. 12MCCh. 1 - Prob. 13MCCh. 1 - The following pseudocode algorithm has an error....Ch. 1 - Available Credit A program that calculates a...Ch. 1 - Sales Tax A program that calculates the total of a...Ch. 1 - Account Balance A program that calculates the...Ch. 1 - The variable x starts with the value 0. The...Ch. 1 - The variable a starts with the value 10. The...Ch. 1 - Prob. 1SACh. 1 - Prob. 2SACh. 1 - What is the difference between operating system...Ch. 1 - Prob. 4SACh. 1 - Why must programs written in a high-level language...Ch. 1 - Why is it easier to write a program in a...Ch. 1 - What is a source file?Ch. 1 - Prob. 8SACh. 1 - What is an algorithm?Ch. 1 - What is a compiler?Ch. 1 - What must a computer have in order for it to...Ch. 1 - What is the difference between machine language...Ch. 1 - Why does byte code make Java a portable language?Ch. 1 - Prob. 14SACh. 1 - Prob. 15SACh. 1 - What part of an object forms an interface through...Ch. 1 - Prob. 17SACh. 1 - What is a class?Ch. 1 - How is a class different from an object?Ch. 1 - What object-oriented programming characteristic...Ch. 1 - What type of program do you use to write Java...Ch. 1 - Will the Java compiler translate a source file...Ch. 1 - What does the Java compiler translate Java source...Ch. 1 - Prob. 24SACh. 1 - Prob. 25SACh. 1 - Your First Java Program This assignment will help...
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