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Is there a utility that you can set up to watch a file, (meaning that the software tells the OS that it wants to notified when the file is written to) and send a notification email when the file reaches a certain size?

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I see many commercial utilities that can do this, and am sure free ones exist as well. This is also something that should be possible to do using a quick 'n' dirty script, periodically run by the OS' scheduler. If you want a specific answer, you'll need to tell us which OS you use (a Windows PS script can be found here:…) – Karan Aug 12 '12 at 22:35
@Karan That's good for now, but it doesn't "watch" a file, it checks it at a specified interval. Watching it means more of subscribing to an event that is fired off when the file is modified, which sends a message containing the new file size to the script. – leeand00 Aug 13 '12 at 14:44

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