How do i check the size of a file?

I want to be able to determine the size of a file in a directory. If the file has size 0kb (ie. no content), i need to be alerted to this. Is there an easy way to do this without having to read the contents of the file itself?
thanks.

File.length();

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http://forums.adobe.com/thread/845731
http://forums.adobe.com/message/3234794
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Tutorial HD to SD w/CS4 http://bellunevideo.com/tutorials/CS4_HD2SD/CS4_HD2SD.html
Exporting to DVD http://help.adobe.com/en_US/premierepro/cs/using/WS3E252E59-6BE5-4668-A12E-4ED0348C3FDBa.h tml
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After Effects Tutorials http://www.videocopilot.net/
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Photo Scaling for Video http://forums.adobe.com/thread/450798
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CS6 http://www.dvxuser.com/V6/showthread.php?282290-New-Tutorial-Working-Faster-in-Premiere-Pr o-CS6
Encore http://tv.adobe.com/show/learn-encore-cs4/
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Regions and NTSC vs PAL http://forums.adobe.com/thread/951042
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How do i check the size of a file?

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