Answer:
A.
Explanation:
The program allows the user to type in any linux command and then executes that command, such as "pwd" or "echo". The problem is that it should allow multiple commands to be typed in and executed at the same time, but it only allows one at a time currently. Please help fix it so it allows multiple commands to be typed and executed.
Code:
#include
#include
#include
#include
#include
#include
void parse(char *line, char **argv)
{
while (*line != '\0') { /* if not the end of line ....... */
while (*line == ' ' || *line == '\t' || *line == '\n')
*line++ = '\0'; /* replace white spaces with 0 */
*argv++ = line; /* save the argument position */
while (*line != '\0' && *line != ' ' &&
*line != '\t' && *line != '\n')
line++; /* skip the argument until ... */
}
*argv = '\0'; /* mark the end of argument list */
}
void execute(char **argv)
{
pid_t pid;
int status;
if ((pid = fork()) < 0) { /* fork a child process */
printf("*** ERROR: forking child process failed\n");
exit(1);
}
else if (pid == 0) { /* for the child process: */
if (execvp(*argv, argv) < 0) { /* execute the command */
printf("*** ERROR: exec failed\n");
exit(1);
}
}
else { /* for the parent: */
while (wait(&status) != pid) /* wait for completion */
;
}
}
void main(void)
{
char line[1024]; /* the input line */
char *argv[64]; /* the command line argument */
while (1) { /* repeat until done .... */
printf("Enter Shell Command -> "); /* display a prompt */
fgets(line, 1024, stdin); /* read in the command line */
printf("\n");
parse(line, argv); /* parse the line */
if (strcmp(argv[0], "exit") == 0) /* is it an "exit"? */
exit(0); /* exit if it is */
execute(argv); /* otherwise, execute the command */
}
}
This function receives a commend line argument list with the */ /* the first argument being cd and the next argument being the */ /* directory to change.
list 3 things needed in order to complete mail merge process.
pls help me!
Create a Python script that will compare two (2) numbers entered by the user. Refer to the attached image and to the following algorithm. There is no need to create a class similar to how Java works.
3.1. User enters the first number.
3.2. User enters the second number.
3.3. If the first number is less than, greater than, or equal the second number, a message is displayed.
Please Help me. Thank You!
Marry Christmas!
x = int(input("Enter first number\n"))
y = int(input("Enter second number\n"))
if x > y:
print(x, "is greater than", y)
elif x < y:
print(x, "is less than", y)
else:
print(x, "is equal to", y)
i'm not the greatest coder, but it works :)
Write a python program to calculate the sum of three numbers and as well require the user to input the numbers.
Answer:
numbers = []
for i in range(3):
numbers.append(eval(input("Enter number: ")))
print('Sum is:', sum(numbers))
Explanation:
You want to use a loop to prevent repeating your code.
Answer:
numbers = []
for i in range(3):
numbers.append(eval(input("Enter number: ")))
print('Sum is:', sum(numbers))
Write a program that simulates applying a "boost" to a spaceship in a spaceship race game.
A spaceship makes progress by getting a "boost" value between 0 and 10. The boost value
is determined from generating a random number between 0 and 10. Assuming the starting
distance of the spaceship is 0, the program will output the boost value and the total
distance travelled by the spaceship after applying the boost. (Note: Two newlines are output
after the final output of the program).
When a random seed value of 2 is used, the output of the program will look like:
Boost: 6
Distance travelled: 6
Programming languages can be used to simulate several scenarios; in this case, the "boost"
The simulating program in C++ where comments are used to explain each line is as follows:
#include<iostream>
#include<cstdlib>
#include<ctime>
using namespace std;
int main() {
// This sets the seed to time(0)
srand(time(0));
// This generates a random number between 0 and 10, to represent the boost
int boost = rand()%10;
// This prints the required outputs
cout << "Boost: " << boost;
cout << "\nDistance travelled: " << boost;
return 0;
}
Read more about similar programs at:
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Which meter would you use to determine which lamp is defective in the shortest possible time? Explain how you would use this meter and why.
Answer:
bla bla bla bla
Explanation:
I dont anther stand
Which of the following is an example of power redundancy?
UPS
Backup server
RAID
Fault tolerance
A trace table is used for
Answer:
Trace tables are used to allow programmers to trace the value of variables as each line of code is executed.
Explanation:
The values of the variables are displayed in a table and assist the programmer in identifying any potential errors.
Answer:
Trace tables can enable a programmer to trace the values of variables as each line is executed/processed/ran through the program. And yes, can aid programmers to identify potential errors in the code.
Explanation:
In the context of the data administration component of a database management system (DBMS), the acronym CRUD stands for _____.
CRUD is an acronym in database management system (DBMS) that stands for Create, Read, Update, and Delete.
CRUD is an acronym in database management system (DBMS) that stands for Create, Read, Update, and Delete. It is the four basic functions of persistent storage.
CRUD operations are foundation operations every database developer and administrator needs to understand.
Find out more on CRUD at: https://brainly.com/question/651396
How to use section header in word document?
Please answer fast
Answer:
Configure headers and footers for different sections of a document
Click or tap the page at the beginning of a section. Select Layout > Breaks > Next Page. Double-click the header or footer on the first page of the new section.Explanation:
Brainliest if correct. 3. You are researching ways to boost employee morale for a proposal. How can you
avoid copyright issues when you find materials from outside sources? (1 point)
Matching parentheses. An math expression may have a number of parentheses like (, ), [, ], { and }. Each openning parenthesis (, or [, or { must be macthed by a corresponding closing parenthsis ), or ] or }. For example, 12 { 34 / [ 6 * ( 55 - 10 ) / ( 100 20 ) ] } has matched pairs of parentheses, while 12 { 34 / ( 6 * ) ] } does not. Write a function to check whether an input math expression has matched parentheses. The header of the function is given as follows:
bool match( const char exp [ ], const int s);
The input math express is store in the char array exp, and the size of exp is s. It returns true if all parentheses are matched or false otherwise.
You have just purchased a brand new Windows 8 computer. What should you do right away with the Administrator account?
What type of system software manages memory?
Answer:
"Operating System"
Explanation:
The type of system software that manages memory is an operating system. To manage memory, the operating system employs a number of software strategies.
What is system software?The most crucial piece of software that runs on a computer is the operating system. It controls the memory, operations, software, and hardware of the computer.
You can converse with the computer using this method even if you don't understand its language. Memory connections are the structures that come before and after all memory areas, whether they are allocated or available.
Working memory, short-term memory, and long-term memory are the three primary categories of memory. While long-term memory stores your enduring memories, working memory and short-term memory enable you to retain and use transient information.
Therefore, an operating system is a sort of system software that controls memory.
To learn more about system software, refer to the link:
https://brainly.com/question/12908197
#SPJ2
challenge encountered
Answer:
What challenge?
Explanation:
Read two numbers from user input. Then, print the sum of those numbers.
Hint -- Copy/paste the following code, then just type code where the question marks are to finish the code.
num1 = int(input())
num2 = ?
print(num1 + ?)
Answer:
First ? - int(input())
Second ? - num2
Explanation:
This works because we are just mimicing the first input in your first variable.
The second one is adding them together.
Don't remember to give me brainliest :)
list different examples of models
Answer:
Planet 3D model
Chemical reactions on a computer simulation
Flowchart of how science has changed over time
Tectonic plate movement in a drawing or picture
Making an Atom cake (i've done it and it was fun)
Earth foam Structure with a quarter or it cut out to show the inside
What type of databases is not limited by the data’s physical location?
Please hurry, it's a test! 30 POINTS. :)
What computing and payment model does cloud computing follow?
Cloud computing allows users to_____ computing resources and follows the ______
payment model.
1. Buy, Own, Rent, Sell
2. pay-as-you-go, pay-anytime-anywhere, pay-once-use-multiple-times
In Python which is the correct method to load a module math?
Answer: The math module is a standard module in Python and is always available. To use mathematical functions under this module, you have to import the module using import math .
Explanation:
I really need help with this question! Please help!
Answer:
(C) Emma goes to sleep late and does not set an alarm.
Explanation:
Decomposing a problem is setting a back drop inference as to (WHY?) something happens . So Emma woke up late , the only reasonable (WHY?) in this question would be (C)
List the four types of computer cases
Answer:
full-tower, mid-tower, mini-tower, and SFF(Small Factor Form).
I hope it helps.
(a) Explain what the following Java components are used for.JListJFrameFLowLayoutJpanelJFrameEventListener(b) Write simple Java codes to illustrate how each one of the above components are implemented.
Answer:
Welcome to Gboard clipboard, any text you copy will be saved here.
please write an Introduction on intrusion detection system and prevention system
PLEASE
Answer:
An Intrusion Detection System (IDS) is a system that monitors network traffic for suspicious activity and issues alerts when such activity is discovered. It is a software application that scans a network or a system for harmful activity or policy breaching. Any malicious venture or violation is normally reported either to an administrator or collected centrally using a security information and event management (SIEM) system. A SIEM system integrates outputs from multiple sources and uses alarm filtering techniques to differentiate malicious activity from false alarms.
True or False: VLANs in cloud computing are most likely to be found on direct connections with a CSP.
O True
O False
Based on computing network operation, it is false that VLANs in cloud computing are most likely to be found on direct connections with a CSP.
What is VLAN?VLAN is an acronym of Virtual Local Area Network that establishes its broadcast domain which enables network admins to combine hosts regardless the hosts are connected on the same network switch or not.
Given that the VLAN created its broadcast domain, you are likely not found it on direct connections with a CSP.
Hence, in this case, it is concluded that the correct answer is False.
Learn more about VLAN here: https://brainly.com/question/6769174
Buddys machine shop has a kiosk computer located in the lobby for customers to use. The kiosk computer has recently been updated to Windows 10 from Windows 7 and is not part of a domain. The local computer policy created for Windows 7 has been applied to Windows 10. This policy severely restricts the use of the computer, so that customers can only use the web browser.
Occasionally, an administrator needs to sign in to the kiosk computer to perform maintenance and update software. However, this is awkward because the administrator needs to disable settings in local policy be performing any task. Then, when the tasks are complete, the administrator needs to re-enable the settings in the local policy. Explain how this system can be improved upon.
What unit on a digital camera gives added illusions
Consider the following declaration:
String s = "cat";
Which of the following statements assigns the number of characters in s to k?
A. int k = s.length;
B. int k = s.length();
C. int k = s.size;
D. int k = s.size();
Consider the following declarations:
String s1 = "apple";
String s2 = "apple";
What is the result of s1.compareTo(s2)?
A. true
B. false
C. 0
D. 1
Consider the following declarations:
String s1 = "apple";
String s2 = "APPLE";
Which of the following expressions is true?
A. s1.equals(s2) && s1.equalsIgnoreCase(s2)
B. !s1.equals(s2) && s1.equalsIgnoreCase(s2)
C. s1.equals(s2) && !s1.equalsIgnoreCase(s2)
D. !s1.equals(s2) && !s1.equalsIgnoreCase(s2)
Answer:
B, C, B
Explanation:
According to my understanding of these questions, these are in Java.
For the first one, there is a built in function called .length() for a string, so it's answer B.
For the second one, this should come out as C, 0 since compareTo compares the ascii values of the characters.
The third one's answer should be B. s1.equals(s2) for characters that are caps and not caps comes out with false, so ! would negate it. s1.equalsIgnoreCase(s2) would come out as true, ignoring the cases of APPLE.
So has anyone opened the link/file those people are giving out as answers? Like what are they, viruses, answers, nothing??? Someone that has opened one tells me what it was and what happened because I am to scared to open it.
Answer:
They're viruses that why they answer so quick and get deleted quickly
Professor Gekko has always dreamed of inline skating across North Dakota. He plans to cross the state on highway U.S. 2, which runs from Grand Forks, on the eastern border with Minnesota, to Williston, near the western border with Montana. The professor can carry two liters of water, and he can skate m miles before running out of water. (Because North Dakota is relatively flat, the professor does not have to worry about drinking water at a greater rate on uphill sections than on flat or downhill sections.) The professor will start in Grand Forks with two full liters of water. His official North Dakota state map shows all the places along U.S. 2 at which he can refill his water and the distances between these locations. The professor’s goal is to minimize the number of water stops along his route across the state.
a. Give an efficient algorithm by which he can determine which water stops he should make.
b. Prove that your strategy yields an optimal solution, and give its
The efficient algorithm by which he can determine which water stops he should make; has been determined below and the strategy which is the greedy strategy has been proven to yield an optimal solution.
To solve this question optimally, we will make use of the greedy solution.
In this method, we will maximize the distance that can be covered from a particular point in such a way that there must be a place where water can be gotten before a run out is experienced.
Now, the first point at which there will be a stop should be located at a point that is farthest from the starting position and is also made to be ≤ m miles from the starting position.
Now, this this situation is one that shows optimal substructure and since our first stopping point will be made to be at p, it means that we are solving the sub-question with the assumption that our starting point is at p.
When we combine the two stated plans above, we will arrive at an optimal solution for the normal reasons via cut and paste.
B) Now we need to show that the greedy approach earlier used produce a first stopping point which is contained in the optimal solution.
Let O represent any optimal solution whereby the professor stops at positions o₁, o₂, o₃....oₙ.
Let h₁ represent the farthest stopping point that is reachable from the starting point. Then we can replace o₁ by h₂ to generate a modified solution H since o₁ - o₂ < o₂ - h₁.
Finally, we can really make it to the positions in H without having to run out of water and since H has the same number of stops, we can conclude that h₁ is contained in one of optimal solution.
Therefore our strategy which is the greedy strategy has been proven to work.
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