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What are directories /opt, /usr/ and /var for

807557Aug 8 2007 — edited Aug 9 2007
After a quick look at the Solaris 10 file system layout, I am not clear what are the functionalities of the directories /opt, /usr/ and /var. For example, if I am installing some software for all users of the system such as Adobe reader, which directory should I put the software files in?
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Locked on Sep 6 2007
Added on Aug 8 2007
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