Trigger on file change

Dan Nelson dnelson at
Tue May 13 08:03:42 PDT 2003

In the last episode (May 13), Guy Van Sanden said:
> I need to have a script run everytime a file changes. The file only
> changes once every month (tops), but the script needs to be run
> rather fast after the change (5-10 minutes)
> I thought of leaving the script looping, making a checksum / date
> check every time and sleeping the rest, but it seems like a lot of
> overhead (disk access).
> Does anyone know of a utility that can do this, possibly one that can
> monitor filehandlers in the kernel?

Try the wait_on port;  it registers a kevent for each filename or
directory listed on the commandline, then waits for something to

	Dan Nelson
	dnelson at

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