Experiment 4

Q1 Create a C program that prompts the user to enter a directory name and uses the mkdir system call to create the directory.
Ans.1 



#include <stdio.h>

#include <stdlib.h>

#include <sys/stat.h>

#include <sys/types.h>



int main() {

    char dirname[100];



    // Prompt user to enter directory name

    printf("Enter directory name: ");

    scanf("%s", dirname);



    // Create directory using mkdir system call

    if (mkdir(dirname, 0777) == -1) {

        perror("Error creating directory");

        exit(EXIT_FAILURE);

    }



    printf("Directory '%s' created successfully.\n", dirname);



    return 0;

}

Q2)Write a program that opens the current directory using opendir and reads its contents using readdir, then displays the list of directory entrics.



Ans.2

#include <stdio.h>

#include <stdlib.h>

#include <dirent.h>



int main() {

    DIR *dir;

    struct dirent *entry;



    // Open current directory

    dir = opendir(".");

    if (dir == NULL) {

        perror("Error opening directory");

        exit(EXIT_FAILURE);

    }



    // Read directory entries and display them

    printf("Contents of current directory:\n");

    while ((entry = readdir(dir)) != NULL) {

        printf("%s\n", entry->d_name);

    }



    // Close directory

    closedir(dir);



    return 0;

}

Q3) Create a C program to delete a directory specified by the user using the rmdir system call.

Ans.3 



#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>



int main() {

    char dirname[100];



    // Prompt user to enter directory name

    printf("Enter directory name to delete: ");

    scanf("%s", dirname);



    // Delete directory using rmdir system call

    if (rmdir(dirname) == -1) {

        perror("Error deleting directory");

        exit(EXIT_FAILURE);

    }



    printf("Directory '%s' deleted successfully.\n", dirname);



    return 0;

}


q4)Write a program that uses the getcud system call to retrieve the current working directory and displays it to the user. 


Ans. 4



#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>



#define MAX_PATH_LEN 4096



int main() {

    char cwd[MAX_PATH_LEN];



    // Get current working directory using getcwd system call

    if (getcwd(cwd, sizeof(cwd)) == NULL) {

        perror("Error getting current working directory");

        exit(EXIT_FAILURE);

    }



    // Print current working directory

    printf("Current working directory: %s\n", cwd);



    return 0;

}