SIMULATION OF LS COMMAND

AIM:

To write a C program to simulate ls command.

ALGORITHM:

1. Start the process.
2. Create a directory entry using dirent structure.
3. To define a pointer to a structure, dp predefined structure DIR and another pointer to a structure called ep.
4. The directory is opened using the opendir() function.
5. In the while loop read each entry using the readdir() function which returns a pointer.
6. If no pointer is returned the program is exited, else it will list the files inside the directory.
7. The closedir() function closes this open directory.
8. Stop the process.

PROGRAM:

#include<stdio.h>

#include<dirent.h>

Struct dirent *dptr;

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

{

char buff[256];

DIR *dirp;

Dirp=opendir(“.”);

printf(“\n \n enter directory name”);

scanf(“%s”,buff);

if((disp=opendir(buff))==NULL)

{

printf(“error”);

exit(1);

}

while (dptr==readir(disp))

{

printf(“%s \n”,dptr->d_name);

}

closedir(dirp);

}

OUTPUT:

Enter directory name      ex3

a.out

ex1.c

ls

ex3a

ex1

ex3.c

RESULT:

 Thus the given C Program is executed and output is verified.