These are using Linux permissions and system calls, please help
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These are using Linux permissions and system calls, please help
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- Which line of code creates a Scanner to read a file named "input.txt"? A, Scanner in = new Scanner (System.in); B. Scanner in = new Scanner (new File(input.txt)); C. Scanner in = new Scanner (new File("input.txt")); D. Scanner in = new Scanner (input.txt); E. none listedWhich of the following operations should only be allowed to be done when the CPU is in kernel mode? Group of answer choices 1) Read data from a file 2) Open a file for reading, writing, or both 3) Set the time-of-day clock 4) Read the time-of-day clock A programmer opened a file using the file descriptor fd. The file contains the following sequence of bytes: 12, 14, 33, 33, 33, 12, 14, 1, 6, 33, 12, 14, 1, 6, 12 The programmer then uses these two system calls: lseek(fd, 3, SEEK_SET); read(fd, &buffer, 4); note, the lseek call makes a seek to byte 3 of the file. What does buffer contain after the read system call completes? Group of answer choices 1) 33 33 33 12 2) 33 33 12 14 3) 33 12 14 1 4) 33 12 14 In a uniprocessor system, multiprogramming increases processor efficiency by: Group of answer choices 1) All of the above 2) Increasing processor speed 3) Eliminating all idle processor cycles 4) Taking advantage of time wasted by long wait…1- Use the cat command to create a file. Name of this file should be file1. Type a few sentences inthis file. Save this file. Use the cat command one more time to display the content of file1.2- Use vi command to add more lines to this file so you can answer the rest of these questions thatuses regular expressions and grep command.3- Select the lines from file file1 that have exactly three characters in them.4- Select the lines from file file1 that have at least three characters in them.5- Select the lines from file file1 that have three or less characters in them.6- Select the non-blank lines from the file file1.7- Select the lines from file file1 that start with a capital letter.8- Select the lines from file file1 that end with a period.9- Select the lines from file file1 that have the string unix.10- Select the lines from file file1 that end with the string unix.11- Select the lines from file file1 that have only the string unix.12- Select the lines from file file1 that have the…
- Assume the following files are in the working directory: $ ls output.txt notes1 notes2 notestxt notes3 notes4 output.1 output.2 output.3 output-1b output-2b Give commands for each of the following, using wildcards to express filenames with as few characters as possible. a. List all files that begin with output. b. List all files that end in txt. c. List the output. files only. d. List the output.1, output.3, notes1, and notes3 files.Python script that uses the os module 1. Display the current working directory. 2. Create a new directory called "test_dir" in the current working directory. 3. Change the current working directory to "test_dir". 4. Verify the current working directory has been changed. 5. Create a new file named "test_file.txt" in "test_dir". a. You must write the following contents to test_file.txt: This is a test file. 6. Verify that "test_file.txt" was created by listing the contents of "test_dir". 7. Display the file size and the last modification time of "test_file.txt". 8. Change the name of "test_file.txt" to "new_test_file.txt". 9. Verify the name change by listing the contents of "test_dir" again. 10. Finally, remove "new_test_file.txt" and "test_dir", verifying each deletion by listing the contents of the parent directory.Create a new file (in Dev C++) and save it as lab10_XYZ.cpp (replace XYZ with your initials). In Lab 2, you created a menu for a simple calculator program. In Lab 6, you added some functionality based on the user selection. In Lab 7, you added some functionality for a main program loop and input validation. In this lab, you will create some general purpose functions to offload some of the tasks in main(). Write functions for: displaying a message (void) display menu and return user selection (int) prompt user for a number and return the number (int) adding (void) subtracting (void) multiplying (void) dividing (void) checking if number is 0 (bool) Prototypes must be written for each function. Definitions for each function may be in any order, after main(). Call functions as needed. Remember that functions can call other functions. If you see the same code repeating in different places, there is a good chance that a function could be used to simplify things. By now, you've gone…
- How can data be written to the end of a text file? A. By setting the mode parameter in the open statement to "w". B. By using the append() method. C. By using the writeAppend() command. D. By setting the mode parameter in the open statement to "a". Lines read from a text file A. are written as they are read. B. are deleted from the file as they are read. C. include trailing line breaks. D. are superfluous. How can a file be opened for writing? A. A file can be opened for writing by using the openWrite() command. B. A file can be opened for writing by using the writeOpen() command. C. A file can be opened for writing by including a mode parameter set to "a" or "w" in the open() command. D. A file can be opened for writing by omitting the mode parameter in the open() command. What happens if you write lines of text to a file without including the line breaks? A. Python automatically adds a line break to each line. B. The file will consist of a single…Write a script named copyFile.py. This script should prompt the user for the names of two text files. The contents of the first file should be input and written to the second file. An example of the program input is shown below: Enter the input file name: copyFrom.txt Enter the output file name: copyTo.txt Output: After running the program, a file named copyTo.txt will be outputted that contains the text from the copyFrom.txt file.When a file is opened in this mode, data will be written at the end of the file’s existing contents.a. output modeb. append modec. backup moded. read-only mode
- . Which of the following options can be used to read the first line of a text file "Myfile.txt"? a. myfile = open('Myfile.txt'); print(myfile.read(line)) b. myfile = open('Myfile.txt','r'); print(myfile.read(1)) c. myfile = open('Myfile.txt'); print(myfile.readline()) d. myfile = open('Myfile.txt'); print(myfile.readlines())You have redirected Standard Error to a file called Errors. You view the contents of thisfile afterward and notice that there are six error messages. After repeating the procedure,you notice that there are only two error messages in this file. Why?a. After you open the file and view the contents, the contents are lost.b. The system generated different Standard Output.c. You did not append the Standard Error to the Error file, and as a result it wasoverwritten when the command was run a second time.d. You must specify a new file each and every time you redirect because the systemcreates the specified file by default.Two programs are required. In each program: 1. Write a program named filemaker.py that will be used to store the first name and age of some friends in a text file named friends.txt. The program must use a while loop that prompts the user to enter the first name and age of each friend. Each of these entries should be written to its own line in the text file (2 lines of data per friend). The while loop should repeat until the user presses Enter (Return on a Mac) for the name. Then, the file should be closed and a message should be displayed. See Sample Output.SAMPLE OUTPUT Enter first name of friend or Enter to quit DennyEnter age (integer) of this friend 24Enter first name of friend or Enter to quit PennyEnter age (integer) of this friend 28Enter first name of friend or Enter to quit LennyEnter age (integer) of this friend 20Enter first name of friend or Enter to quit JennyEnter age (integer) of this friend 24Enter first name of friend or Enter to quit File was created 2. Now write a…