#include  <unistd.h>
#include  <sys/stat.h>
#include  <fcntl.h>
#include  <stdlib.h>

int  main()
{
char  c;
int  in,  out;
in  =  open("in.dat",  O_RDONLY);
out  =  creat("out.dat",  0644);
while  (read(in,  &c,  1)  ==  1)  {
write(out,  &c,  1);
}
close(in);
close(out);
exit(0);
}