please give right answers do not use other webiste and vhatgpt for this answer its giving wring answers all time please 18 19 31 answer correctly 31. Assuming ls -1 /home/cs288 returns a string'drwxr-xr-x+ 1 CS288 CS288 123 Dec 25 2013'the command to find the file size 123 is(b)cut -d'' - £4(e)none of the above(a)cut -d'' -£3(d)cut -f' ' -d432. Consider a list of file sizes 1st = (1 2 3 4 5), the average file size is computed by:sum=0; n=${#1st [@] };(a) for ((i=0;i 16. Given 1st =for a in(a) 0123(b c d e), the for loop below will print:${!1st [@] }; do echo $a; done;(b)1234(c) bc de(d)4(e)none of the above17. Given a= (1 2) and b= (x y), what is the Bash command to obtain c= (1 2 x y)?(a) ($a $b)(b) ($a) ($b)(c) ${a[@]} ${b[@]}(d) (${a[@]} ${b[@]})(e)none of the above18. Given f () and main (), what is the output when main is called?function f() { local p=$2; q=1; r=$1; }function main () { p=1; q=2; r=3; f $p $q $r; echo $p $q $r; }(a)1 11(b)1 12(c)3 32(d)3 11e)None of the above19. Given f() and main() below, calling "main 3 2 1" will print:function () { local y=$1; local z=$2; echo $x $y $z; }function main () { local x=$1; y=$2; z=$3; f $x $y $z; }(a)3 2 3(b)3 2 2(c)3 32(d)3 11(e)None of the above[[ $x < $y ]] && echo yes(e)none of the above20. Determine the output for the Bash statements: x=12;| echo no;(a)yesy=123;(c)command not found (d) errors(b)no

A string is a sequence of characters, typically used to represent textual data in programming. In…

31. Assuming ls -1 /home/cs288 returns a string 'drwxr-xr-x+ 1 CS288 CS288 123 Dec 25 2013' the command to find the file size 123 is (a)cut-d'' -£3 (d)cut -f' ' -d4 (b)cut -d' - £4 (e)none of the above (c)cut -f' -d4 "

31. Assuming ls -1 /home/cs288 returns a string 'drwxr-xr-x+ 1 CS288 CS288 123 Dec 25 2013' the command to find the file size 123 is (a)cut-d'' -£3 (d)cut -f' ' -d4 (b)cut -d' - £4 (e)none of the above (c)cut -f' -d4 "

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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given a text file (data1.txt) that consists of different garbage strings.1.Create a new file, from data1.txt, which contains all the strings from theprevious file with the following constraints:-No special characters or digits must be in the new string-No repetition of letters in the new string• Save the newly generated text-file as data2.txtThe following example in table 1 shows what your output file should contain.data1.txt data2.txtf5@p fpp&ott6 potInstructions:Create a class cleanFile to read in data1.txtClean the data inside the files following the rules in the above exampleWrite the cleaned data into data2.txt
You have been given the file awards.psvThis file contains information about Nobel Prize, Turing Award and Fields Medal winnersEach line in the file contains the following six fields:1. Award Name2. Award Year3. Winner Name4. Winner Gender5. Winner Country6. Winner Birth YearEach field is separated from the next field by a pipe character ( | ).Your task is to write four grep commands which will print specified lines from this file.You have been given the file final_q1.txt .In final_q1.txt add answers to the four questions.Add each answer in the specified location.Do not add, remove, or change any other text in the file.The autotest depends on the exact format of the file.Each question should be answered with a single grep command.You may use any regular expression syntax supported by grep.You may use any options supported by grep except -P/--perl-regexp .1. Question 1Write a grep command that will print the lines in awards.psv that contain awards won by an Australian.2. Question 2Write…
Please write in C txt files: puzzleWrong.txt 5 5 7H 1 1 MILK White liquid produced by the mammalsH 2 1 IN Used to indicate inclusion within space, a place, or limitsH 3 3 BUS A road vehicle designed to carry many passengersH 5 3 DAN The name of a famous author whose surname is BrownV 1 1 MARS Red planetV 3 3 BAD Opposite of goodV 2 5 ISBN International Standard Book Number puzzle2010Long.txt 6 6 14H 1 1 NA Symbol of Sodium elementH 1 4 BUS A road vehicle designed to carry many passengersH 2 3 POP Opposite of push operation in stacksH 3 3 NS Abbrev. Nuclear SclerosisH 4 1 TOSS To throw up in the airH 5 1 HR Abbrev. Human ResourcesH 5 5 TR Internet country code of TurkeyH 6 5 AG Symbol of Silver elementV 1 1 NORTH Opposite direction of southV 4 2 OR Used to connect different possibilitiesV 2 3 PNS Peripheral nervous systemV 1 4 BOSS A person who is in charge of a worker or organizationV 1 5 UP Opposite of downV 5 5 TA Symbol of Tantalum elementV 5 6 RG Symbol of Roentgenium element…
Q_____Q.6. Create a JSON file named invoice.json and write into it the following dictionary: invoice_dict = {' invoice": [{part_num': 500, 'part_descr': 'hammer', 'quantity": 10)}, {'part_num': 600, 'part_descr': "screwdriver', 'quantity': 5)}]} Then, read the file with catching exception like FileNotFoundError in a try suite. Display its pretty-printed JSON (p.330). Output?.
Exercise 1: Please create a script that print “Hello, your name.” • Exercise 2: Please create a directory call user_bin, and add it to PATH. Then mv script of Exercise 1 to user_bin. Then run it from your root directory.• Exercise 3: Add a new command call ‘l’ which will perform exact same as ‘ls -a’. • Exercise 4: Create a function call sortFile, which will sort all filenames of current directory. Exercise 6: Could you add one variable in the example, name the variable as greeting, which displays “Hello, my name is xxx xxx” in the body using variable greeting
For example, if you create a file named: "users.txt" that contains these user names: daniel moshe yossy gabi ran bijo baruch bibi The following command run in an elevated command prompt will parse this file, and create a new user on your computer FOR /F %i in (users.txt) DO NET USER %i P@ssw0rd /ADD With two (2) other options that you specify for each user when they are added?
Modify rnfile such that it will keep a copy of the old existing file (if available) before the renaming operating. Assume that apple.txt will be renamed as orange.txt. When the command “./rnfile apple.txt orange.txt” is executed, the script will first check whether orange.txt exists under the given path or not. If the file exists then orange.txt will be renamed as orange.txt_old before renaming apple.txt as orange.txt. Make rnfile an executable shell script; try to rename a file to a filename that already exists. Show your shell program and its output to the instructor.
// switch_stdout.c: demonstrates use of dup2() and dup() to redirect // standard output to a new location temporarily and then restore it. #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> int main(){ int stdout_bak = dup(STDOUT_FILENO); // make a backup of stdout system("rm -f mystery.txt"); // remove file using a shell command int out_fd = open("mystery.txt", // open file mystery.txt O_WRONLY|O_CREAT, // for writing, create if needed S_IRUSR|S_IWUSR); // give user read/write permission if(out_fd == -1){ // check for errors opening file perror("Couldn't open file 'mystery.txt'"); exit(1); // bail out if open fails } printf("1. Now you see me.\n"); // print to the screen dup2(out_fd, STDOUT_FILENO); // change stdout to go to mystery.txt printf("2. Now you don't!\n"); // print goes to…
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.
modify minishell.c to run who, ls, and date with option. who will show the count of users, ls will list files in long listing format and date will show UTC time. Modify this file so the shell can run commands with options.*/#include <stdio.h>#include <unistd.h>#include <sys/types.h>#include <sys/wait.h>#include <stdlib.h>#include <fcntl.h> int main(int argc, char *argv[]){ char *cmd[] = {"who", "ls", "date"}; int i; while(1){ printf("0=who 1=ls 2=date : "); scanf( "%d", &i ); if(i<0 || i>2) continue; pid_t result= fork(); if(result==0) { /* child */ execlp( cmd[i], cmd[i], (char *)0 ); printf("execlp failed\n"); exit(1); } else if (result >0){ /* parent */ int status; wait(&status); } else{ //handle error } } return 0;}
I have an issue with trying to modify my code, I need to instead to work such that a user imputs a file paths and the program synchronizes themthe code is too long to post so I have placed it belowhttps://github.com/Philanthropenos/2023-final-work-for-os-class/blob/main/Attempt1.1
Modify this code to let it run concurrently to send and receive any messages between 2 processes and take one command line argument to change between 2 processes, for example, 1 or 2 to indicate the process 1 or process 2. #include <unistd.h>#include <stdlib.h>#include <stdio.h> #include <string.h>#include <fcntl.h>#include <sys/types.h>#include <sys/stat.h>#define FIFO_NAME “/tmp/my_ fo”int main(int argc, char *argv[]){int res, open_mode = 0; if (argc < 2){fprintf(stderr, “Usage: %s <[O_RDONLY, O_WRONLY, O_RDWR, O_NONBLOCK]>\n”, *argv); exit(EXIT_FAILURE);}argv++;if (*argv){if (strncmp(*argv, “O_RDONLY”, 8) == 0)open_mode |= O_RDONLY;if (strncmp(*argv, “O_WRONLY”, 8) == 0)open_mode |= O_WRONLY; if (strncmp(*argv, “O_RDWR”, 6) == 0) open_mode |= O_RDWR;if (strncmp(*argv, “O_NONBLOCK”, 10) == 0)open_mode |= O_NONBLOCK;} if (access(FIFO_NAME, F_OK) == -1{res = mk fo(FIFO_NAME, 0777);if (res){fprintf(stderr, “Could not create fo%s\n”,…