Running a command if any files are copied.

Just discovered Aap yesterday. Very impressive! 

Question: What's best way to copy one or more changed files to a local
target and  if (and only if)  any files were copied, run a system
command?

For example, here's a snippet from a  main.aap I'm creating to replace
a fairly complicated makefile.

  #install the udev rules
  :sys cp acceleron.rules /etc/udev/rules.d/
  :sys /sbin/udevstart

This always copies the rules file and always runs udevstart.  I'd like
to copy the rules only when the file changes and only run udevstart
when a file was copied.  I'd also like to generalize it to handle more
than one .rules file.

After going through the manual, this seems like a publish rather than
a compile situation, but I couldn't figure out how to hook the call to
udevstart to the publish action.

Thanks,
Mike Ellis

-- 
Michael F. Ellis
Managing Partner
Ellis & Grant, Inc.
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