A du puzzle

[Herta Van den Eynde]

Tom Hansen wrote:
> Why is it that
> 
>   du -x | grep "^[^/]*/[^/]*$"
> 
> is much faster than
> 
>   du -sx *
> 
> ??
> 

In what order did you execute the commands?  Might be that the info was 
still in memory.  Just look at the timed sequence below.

Kind regards,

Herta

# time du -x | grep "^[^/]*/[^/]*$"
(...)
real    1m11.196s
user    0m1.544s
sys     0m4.988s

# time du -sx *
(...)
real    0m1.482s
user    0m0.312s
sys     0m1.048s

# time du -x | grep "^[^/]*/[^/]*$"
(...)
real    0m1.845s
user    0m0.592s
sys     0m1.084s

Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm