#include<stdio.h>
#include<fcntl.h>
#include<stdlib.h>
#include<unistd.h>
int main(int argc, char *argv[])
{
int f1 = 0, f2 = 0;
char buf[50];
long int n = 0;
f1 = open(argv[1], O_RDONLY);
f2 = open(argv[2], O_CREAT | O_WRONLY | O_TRUNC, 0700);
if(f1 == -1 || f2 == -1)
{
perror("File open error\n");
exit(1);
}
n = read(f1, buf, 50);
while(n > 0)
{
if(write(f2, buf, n) != n)
{
perror("Problem in writing\n");
exit(3);
}
n = read(f1, buf, 50);
}
if(n == -1)
{
perror("Problem in reading\n");
exit(2);
}
close(f2);
return 0;
}







#include<stdio.h>
#include<dirent.h>
#include<stdlib.h>
int main()
{
char dirname[10];
DIR*p;
struct dirent *d;
printf("Enter directory name\n");
scanf("%s",dirname);
p=opendir(dirname);
if(p==NULL)
{
perror("Cannot find directory");
exit(-1);
}
while(d=readdir(p))
printf("%s\n",d->d_name);
return 0;
}