Reactive systems -- was: Event scheduling

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On Fri, 16 Feb 2007, Frank M. Ramaekers wrote:

Okay, I know about 'cron' and 'at', but how do you schedule jobs
(scripts) based on events.

For instance:  Run script xyz when file abcd.efg arrives via ftp?

Emit an event into a queue, and periodically wake up and harvest the queue --

ls and diff can detect newly present files

so can find

procmail can trivially detect and fire off email related enqueuing events

-- Russ Herrold
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