EBK STARTING OUT WITH PYTHON
3rd Edition
ISBN: 9780133743661
Author: GADDIS
Publisher: PEARSON CUSTOM PUB.(CONSIGNMENT)
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Textbook Question
Chapter 1, Problem 4SA
What are the words that make up a high-level
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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
EBK STARTING OUT WITH PYTHON
Ch. 1.2 - What is a program?Ch. 1.2 - What is hardware?Ch. 1.2 - List the five major components of a computer...Ch. 1.2 - What part of the computer actually runs programs?Ch. 1.2 - What part of the computer serves as a work area to...Ch. 1.2 - Prob. 6CPCh. 1.2 - Prob. 7CPCh. 1.2 - What part of the computer formats and presents...Ch. 1.2 - Prob. 9CPCh. 1.2 - Prob. 10CP
Ch. 1.2 - Word processing programs, spreadsheet programs,...Ch. 1.3 - What amount of memory is enough to store a letter...Ch. 1.3 - Prob. 13CPCh. 1.3 - In what numbering system are all numeric values...Ch. 1.3 - Prob. 15CPCh. 1.3 - What encoding scheme is extensive enough to...Ch. 1.3 - Prob. 17CPCh. 1.4 - A CPU understands instructions that are written...Ch. 1.4 - Prob. 19CPCh. 1.4 - When a CPU executes the instructions in a program,...Ch. 1.4 - What is assembly language?Ch. 1.4 - What type of programming language allows you to...Ch. 1.4 - Prob. 23CPCh. 1.4 - What do you call a program that translates a...Ch. 1.4 - What do you call a program that both translates...Ch. 1.4 - Prob. 26CPCh. 1 - A(n) _________ is a set of instructions that a...Ch. 1 - The physical devices that a computer is made of...Ch. 1 - The part of a computer that runs programs is...Ch. 1 - Today, CPUs are small chips known as __________....Ch. 1 - The computer stores a program while the program is...Ch. 1 - Prob. 6MCCh. 1 - Prob. 7MCCh. 1 - Prob. 8MCCh. 1 - Prob. 9MCCh. 1 - Prob. 10MCCh. 1 - Prob. 11MCCh. 1 - Prob. 12MCCh. 1 - Prob. 13MCCh. 1 - Prob. 14MCCh. 1 - Prob. 15MCCh. 1 - Prob. 16MCCh. 1 - Prob. 17MCCh. 1 - Prob. 18MCCh. 1 - Prob. 19MCCh. 1 - In the _______ part of the fetch-decode-execute...Ch. 1 - Prob. 21MCCh. 1 - The __________ translates an assembly language...Ch. 1 - The words that make up a high-level programming...Ch. 1 - Prob. 24MCCh. 1 - A(n)_________ program translates a high-level...Ch. 1 - Today, CPUs are huge devices made of electrical...Ch. 1 - Prob. 2TFCh. 1 - Any piece of data that is stored in a computer's...Ch. 1 - Prob. 4TFCh. 1 - Machine language is the only language that a CPU...Ch. 1 - Assembly language is considered a high-level...Ch. 1 - An interpreter is a program that both translates...Ch. 1 - A syntax error does not prevent a program from...Ch. 1 - Prob. 9TFCh. 1 - Word processing programs, spreadsheet programs,...Ch. 1 - Why is the CPU the most important component in a...Ch. 1 - Prob. 2SACh. 1 - Prob. 3SACh. 1 - What are the words that make up a high-level...Ch. 1 - What are the short words that are used in assembly...Ch. 1 - What is the difference between a compiler and an...Ch. 1 - Prob. 7SACh. 1 - To make sure that you can interact with the Python...Ch. 1 - Prob. 2ECh. 1 - Use what you've learned about the binary numbering...Ch. 1 - Use what youve learned about the binary numbering...Ch. 1 - Look at the ASCII chart in Appendix C and...Ch. 1 - Use the Internet to research the history of the...
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