/*** Example of formatted file usage ***/
#include<unistd.h>
#include<sys/stat.h>
#include<fcntl.h>

#define BlockSize 1024

int main(int argc, char *argv[]){
   char buff[BlockSize];
   int in,out;
   int nread;

   if(argc<3){
      write(2," 1st argument: origin file\n 2nd argument: copy file\n",52);
      return 1;
      }

   in= open(argv[1],O_RDONLY);
   out=open(argv[2],O_WRONLY|O_CREAT|O_TRUNC,S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);

   while((nread=read(in,buff,BlockSize))>0)
      write(out,buff,nread);

   close(in);
   close(out);

   return 0;
   }