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[ale] Systemd daemon take overs

inotify does that. It has been around 15+ years?
Been using that for automatic recorded TV processing for over a decade.

On Thu, 21 May 2020 10:30:58 -0400
Jim Kinney via Ale <ale at ale.org> wrote:

> A systemd feature that is rather helpful:
> It can watch for changes to a file and then perform a scripted action
> when it occurs.
> Example: dual dhcp servers with no shared config file. So systemd on
> each host watches the config. If one changes the script notifies the
> other to stop watching for changes, rsync the files, then start
> watching for changes.