Restoring sticky bits after accidentally moving /usr directory

[Steve Dondley <s@dondley.com>]

I goofed up and accidentally moved my /usr directory while trying to 
make room on a full drive. I was able to recover, but I'm finding that 
services are not working because the sticky bits for many files 
/usr/bin/* were lost. For example, I can't send email with exim because 
of this error:

Failed to create spool file /var/spool/exim4//input//1lj87g-0002tS-5J-D: 
Permission denied

Is there an easy way to ensure I set all the permissions back to where 
they were before I move /usr?