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I am looking to a RSS feed reader or system for Mac OS X that checks every minute or so the feed, and when there are changes it sends me instantly an email. Do you know about something similar?

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On what operating system? –  Nifle Nov 28 '10 at 12:45
    
MAc OS X, thanks –  flow Nov 28 '10 at 13:28
    
As an aside: many RSS feeds are cached. So, even checking every minute won't automatically mean you'll see an up-to-date feed. (See, for example, your own user feed which right now does not include your latest comment nor your latest edit of this very question yet. –  Arjan Nov 28 '10 at 13:35

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up vote 3 down vote accepted

rss2email is an awesome script for this purpose (it can even parse Atom feeds). It is officially supported on Linux and Windows, but as it is a Python script, it should work on OS X just fine, as Python is installed by default on it.

To check the feeds every minute you can add an entry like this to crontab:

* * * * * /path/to/r2e run

crontab can be edited with crontab -e on most Unixes; here is an article about OS X cron variant.

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@Arjan, thanks, edited the answer. I did knew that Ruby is installed by default, but was not sure about Python. –  whitequark Nov 28 '10 at 13:53

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