Interesting Bourne shell usage,

[ajs at hpfcla.UUCP]

> Another note on this is that /bin/sh forks off a process to do
> the for loop when directing its output to a pipe; ksh doesn't.
> This feature, and builtins for echo and expr considerably speed
> up shell script execution in ksh.

Yes, and Bourne shell users beware:  That  "invisible  fork" can lead to
some  real   confusion,  if  you  modify  a  shell  variable   within  a
meta-construct  which  is  redirected.  Don't  expect  the  value  to be
correct after the end of the construct!

Looking forward to ksh,
Alan Silverstein