perl>  echo -ne "hello\x0aWorld" | ./pipe_x-1.pl  # try \n
$s1= <hello
> 
$s2= <hello:
> 

perl>  echo -ne "hello\x0dWorld" | ./pipe_x-1.pl  # try \r
World> ello

perl>  echo -ne "hello\x09World" | ./pipe_x-1.pl  # try \t
$s1= <hello     World>