task1.cpp

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


int main (int argc, char *argv[])
{
   int fd;
   char *file = argv[1];

   char buffer [30];
   size_t nbytes;
   ssize_t bytes_read;

   fd=open(file, O_RDONLY);
   if (fd!=-1)
   {
      printf ("file1 opened for read & write access\n");
    //sed -n '1,10p' < file1   //Not sure what you're trying to do with this.. but it isn't you want to be doing.
      nbytes = sizeof(buffer);
      bytes_read = read(fd, buffer, nbytes);
      close(fd);   //closing file-descriptors is a good thing

      int od;

      od = open ("/dev/tty", O_WRONLY);
      write (od, buffer, bytes_read);
      close(od);
   }
    return 0;
}