Checking thew ststus of a file

Hello,
How can I check the status of a file (open, closed) in a shell script? Is there an example available?
Can I use lsof command and how?

Thanks in advance,
Kumar

Padiyath Sreekumar       |   Tel: +41.56.310.3643
Paul Scherrer Institut   |   email: kumar.padiyath@psi.ch
AIT                      |   Office: WHGA/U132 
WHGA/U132                |   Fax: +41.56.310.3649
CH-5232 Villigen PSI     | 
Switzerland              |
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