#include <stdio.h>
#include <fcntl.h>

#define ERROR -1

main(int argc, char *argv[])
{
	int i,fd1,fd2,status;
        if ((fd1=open("ff",O_WRONLY|O_CREAT,0777))== -1)
              {printf("ERROR\n"); exit(1);}
              printf("%d\n",fd1);
        fd2=dup(fd1);
              printf("%d\n",fd2);
   if ( fork()==0 )  {
        
        close(1);
        open(argv[1],O_WRONLY|O_CREAT, 0777);
        write(1,"HELLO CHILD",11);}

   else {
         wait(&status);
        write(1,"HELLO PARENT",12);}
write(1,"COMMON PART",11); 

}