Question

2 File Management System Write a basic file managment system with following capabilities. Suppose the name of the program is myFS. When it executes as below: myFS Is - /home Figure 6 : First command format The program should provides the file listing of the given directory. The program should list the filename, file size, and time last modified for each file within the directory. The list is shown below: rwxr-xr-x 1 mamal None drwxr-xr-x+ 1 mamal None rwxr-xr-x 1 mamal None rwxr-xr-x 1 mamal None -rwxr-xr-x 1 mama! None rwxr-xr-x 1 mamal None drwxr-xr-x+ 1 mamal None rwxr-xr-x 1 mama! None rwxr-xr-x 1 mamal None rwxr-xr-x 1 mamal None rwxr-xr-x 1 mamal None rwxr-xr-x 1 mamal None rwxr-xr-x 1 mamal None 62645 Jan 19 2017 a. exe 0 Jan 15 2017 bin 171 Feb 27 2017 bingo. c 62848 Feb 27 2017 bingo. exe 187 Feb 28 2017 er.c 62657 Feb 28 2017 buffer.exe 0 Jan 15 2017 build-gcc 110 Jan 19 2017 crash1. c 62645 Jan 24 2017 crash1. exe 891 Jan 24 2017 crash1.exe. stackdump 131 Jan 19 2017 crash2. C 63157 Jan 24 2017 crash2. exe 885 Jan 24 2017 crash2. exe.stackdump Figure 7: Files list with their properties. e program should provide the user with the option to sort the listing based on filename, on file size, or on time last modified. The program should run once and quit (it does not loop). The syntax (usage) for the program should be where -s indicates sort by file size and -t indicates sort by time last modified. For example Th S myFS 1s -1-t /home Figure 8: Files list should be sorted by last time modified. These flags are optional but mutually exclusive. The directory is also optional; if it is omitted, then a default directory of "." (the current directory) should be assumed. Every possible combination of command line arguments from the above syntax should be tested. The output should be displayed with fixed-width columns for the size and date. Column orders should be size, then date, then filename. The time last modified should be printed as a 12-character string (e.g., "Oct 10 11:37") This can be done by manipulating the returned string from the ctime) function and printing only a portion of it The file system prog The syntax command could be as below ram should be able to makes a copy of the source file to the destination address. S myFS cp bing.c /home/bingocp. c Figure 9: The source file (e.g., bingol.c) is copied to destination(e.g., /home/bingocp.c) The command (e.g., See Figure 9) copies bingl.c to the /home/bingocp.c

write the following code using C language. It will be ran in Ubuntu running linux OS

Answer 1

ANSWER:

#include <unistd.h>

#include <stdio.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <dirent.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <unistd.h>

void disPerm(char file[]) {

struct stat fileStat;

lstat(file, &fileStat);

//printf(File permissions: \t.);

printf((S_ISDIR(fileStat.st_mode)) ? "d":"-");

printf((fileStat.st_mode & S_IRUSR) ? "r":"-");

printf((fileStat.st_mode & S_IWUSR) ? "w":"-");

printf((fileStat.st_mode & S_IXUSR) ? "x":"-");

printf((fileStat.st_mode & S_IRGRP) ? "r":"-");

printf((fileStat.st_mode & S_IWGRP) ? "w":"-");

printf((fileStat.st_mode & S_IXGRP) ? "x":"-");

printf((fileStat.st_mode & S_IROTH) ? "r":"-");

printf((fileStat.st_mode & S_IWOTH) ? "w":"-");

printf((fileStat.st_mode & S_IXOTH) ? "x":"-");

printf("\t%ld",fileStat.st_nlink);

//printf(.\t%d.,fileStat.st_uid);

printf("\t%ld",fileStat.st_size);

printf("\t%ld",fileStat.st_atime);

printf("\t%s",file);

printf("\n");

}

int main(int argc, char *argv[]) {

//pointer for dir entry

struct dirent *de;

DIR *dr = opendir(argv[1]);

if(dr == NULL) {

//opendir returns null if it couldn't open dir

printf("Could not open %s directory", argv[1]);

return 0;

}

while((de=readdir(dr)) != NULL) {

char f[50];

strcpy(f,de->d_name);

disPerm(f);

}

closedir(dr); //close directory

return 0;

/*pif(argc .. 1) dlsPerm(...);

else f while(--argc)

{ printf(.%s:\n., *1.1.argv);

disPerm(*argv); 1 1*/

}