Orlin Grigorov wrote:

> Hi.
> 
> This time I've done my research, but still I cannot find a good answer.
> Basically, I need to make a little ocaml process, which runs in the
> background and monitors a specific file for changes.   When a change occurs,
> I want it to back-up a copy of the version of the file at that moment.
> So, what I need is to set some signal or event, which will happen every time
> that file is changed.

If you are on Linux/Unix, have a look at Inotify. The Ocaml bindings are
here:

    http://tab.snarc.org/projects/ocaml_inotify/

HTH,
Erik
-- 
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Erik de Castro Lopo
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"Well behaved women rarely make history." -- Dorothy Parker