Question

Systems Programming in Linux using C

1. Remake the version of the ls -ialR command in C.. In this version of ls, you must also consider symbolic file types.
2. Make sure you have file header comments and function header comments. Also, write inline comments whenever necessary.

Answer 1

1). ANSWER :

GIVENTHAT :

Here is the C code for ls -ialR command.

C-PROGRAM :

// Including necessary or needed header files

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>

// Starting of main function

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

// Declaring the variable DIR
DIR *alldir;
struct dirent *allfile; // all available files
struct stat allstat; // stats of the files

// buffer

char buf[512];

// opening the current dir
alldir = opendir(argv[1]);

// Dir must not equal to Null / Existance of dir must
while((allfile = readdir(alldir)) != NULL)
{

// Printing all files names
sprintf(buf, "%s/%s", argv[1], allfile->d_name);     
stat(buf, &allstat);

// Printing Stats of the files
printf("%zu",allstat.st_size);
printf(" %s\n", allfile->d_name);
}

// Closing the Dir or stats on terminating of program
closedir(alldir);
}

The above program Output : -

Execute the program in linux by this command:- ./program.out Ashok

You will get total directories with name and stats.

Program compiled in CodeBlocks Screenshot:-

In bottom of the screen You can check all directries under that file. ( from "checking for existance")

First it will check for for existance than show all dir. .