Create File comparators that arrange files in ascending/descending order of file size, ascending/descending order of file name, and ascending/descending order of last modification date. Employ these comparators in LS, a programme that accepts a command-line input and lists the files in the current directory in a certain order, such as "-t" to sort by timestamp. To break ties, support several flags. Be certain you use a reliable sort.

Create File comparators that arrange files in ascending/descending order of file size, ascending/descending order of file name, and ascending/descending order of last modification date. Employ these comparators in LS, a programme that accepts a command-line input and lists the files in the current directory in a certain order, such as "-t" to sort by timestamp. To break ties, support several flags. Be certain you use a reliable sort.

LINUX+ AND LPIC-1 GDE.TO LINUX CERTIF.

5th Edition

ISBN:9781337569798

Author:ECKERT

Publisher:ECKERT

Chapter7: Working With The Bash Shell

Section: Chapter Questions

Problem 15RQ

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Create comparators for the type File that arrange files according to file size, file name, and last modification date, in that order, in addition to ascending and descending. Use these comparators in the LS programme, which accepts a command-line input and lists the files in the current directory in the desired order, for example, "-t" to sort by timestamp.To break ties, back many flags. Use a stable sort, please.
Write comparators for the typeFile to order by increasing/decreasing order of file size, ascending/descending orderof file name, and ascending/descending order of last modification date. Use thesecomparators in a program LS that takes a command-line argument and lists the filesin the current directory according to a specified order, e.g., "-t" to sort by timestamp.Support multiple flags to break ties. Be sure to use a stable sort
Write comparators for the type File to order by increasing/decreasing order of file size, ascending/descending order of file name, and ascending/descending order of last modification date. Use these comparators in a program LS that takes a command-line argument and lists the files in the current directory according to a specified order, e.g., "-t" to sort by timestamp. Support multiple flags to break ties. Be sure to use a stable sort
Write a program that uses the natural merge algorithm on the two data files provided (merge_1.txt and merge_2.txt) to merge the two files into one, and then state which value appears at index 100. File format: a single integer that is the number of values to follow, followed by at least that number of integers. That first integer is not part of the data. merge_1.txt 100350 659 684 484 735 514 723 473 127 747 735 167 482 954 914 173 186 910 819 879 403 543 776 674 796 342 84 197 130 968 296 863 739 6 301 684 542 515 199 310 338 274 3 57 391 411 968 621 901 370 16 136 818 56 28 171 599 331 979 329 919 946 814 88 75 425 691 650 777 374 688 625 315 199 412 536 617 200 938 293 560 623 426 958 991 279 321 389 310 5 500 578 161 356 889 792 685 625 59 971 merge_2.txt
Determine the number of comparisons (as a function of n and m) that are performed in merging two ordered files a and b of sizes n and m, respectively, by the merge method presented in the lecture, on each of the following sets of ordered files: a. m=n and a[n/2] < b[1] < b[m] < a[(n/2)+1] b. m=1 and b[1] < a[1] c. m=1 and a[n] < b[1] a[i] refers the value in position i of file a, etc
Could you explain what the R code is doing below? # read in each table read_counts <- lapply(list_of_files, read.table, sep="\t", header = FALSE, skip =2) read_counts <- lapply(read_counts, function(x) x[, c(1,4)]) read_counts <- lapply(read_counts, function(x) x[complete.cases(x),]) # for each dataframe in read_counts transpose and then read_counts <- lapply(read_counts, function(x) t(x[,2]))
In this assignment you will be writing several functions that process files and dictionaries to encryptand decrypt messages. A dictionary will be used to create a random substitution cypher. Each letterof the alphabet will be mapped to another random letter in the alphabet. No letter will map or bemapped to any duplicate letter. For example given the partial dictionary below you can encrypt amessage.Be sure to use the starter file provided so you can see the appropriate outputs. Be sure to downloadand place the appropriate text files in the same directory as your python file. You only need to submityour python file.Partial Dictionary: {d : a, e: f, h : b, l : p, l : e, o : j, r: m, w: i}originalMessage = “hello world” → encryptedMessage = “bfeej ijmea” Part 1 - Encrypt a Message: You will write 2 functions to build a dictionary and encrypt a messageFunction buildCypher() → dict:This function is to build a dictionary that can be used to create a random substitution cypher. Yourgoal is…
In this assignment you will be writing several functions that process files and dictionaries to encryptand decrypt messages. A dictionary will be used to create a random substitution cypher. Each letterof the alphabet will be mapped to another random letter in the alphabet. No letter will map or bemapped to any duplicate letter. For example given the partial dictionary below you can encrypt amessage.Be sure to use the starter file provided so you can see the appropriate outputs. Be sure to downloadand place the appropriate text files in the same directory as your python file. You only need to submityour python file.Partial Dictionary: {d : a, e: f, h : b, l : p, l : e, o : j, r: m, w: i}originalMessage = “hello world” → encryptedMessage = “bfeej ijmea” Part 1 - Encrypt a Message: You will write 2 functions to build a dictionary and encrypt a messageFunction buildCypher() → dict:This function is to build a dictionary that can be used to create a random substitution cypher. Yourgoal is…
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;}
3.2 Modify the order of some of the get requests to prevent the possibility of any deadlock.
2. With HW1Directory as the working directory, give the output of each of the following commands and a brief (~ one sentence) description of what the effect of the command is. 6. echo *[!0-9] 7. echo m[a-df-z]* The file is a directory that contains the following filenames. It is *.txt file feb06 jan05 jan5 jan06 jan07 jan08 jan12 jan19 jan26 mar08 memo memo1 memo2 memo2.sv
Can you help solve this by using the three different files (.h , .cpp, .cpp) list in the photo, please?