[ILUG] How do you find out *why* a filesystem is busy?

[Kenn Humborg]

> Hi all, 
> 
>     Suppose you want to umount /var/spool/mail, but get the 'file 
> system busy' 
> notice from umount.  You've taken sendmail (or whatever) down, 
> but there are 
> (say) five users logged onto the machine with (say) fifty 
> processes between 
> shells, xloads, netscapes, exotic number-crunching processes that 
> have been 
> running niced for the past eight days, etc.

man fuser
man lsof

Later,
Kenn