[Leaplist] list files not from rpm

[Ingo Claro]

I'm using centos 5 and wan't to know the files that are not from rpm 
packages.

I've come up with the following, but it's very slow:

find / ! -path "/proc*" ! -path "/dev*" ! -path "/sys*" -exec rpm -qf {} 
 >> list.txt \;

and then:
grep "not owned" list.txt

is there a better way?

regards,
Ingo

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