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http://en.wikipedia.org/wiki/Universally_Unique_Identifier
http://www.ossp.org/pkg/lib/uuid/
You'll first need to install the uuid package. Available immediately from apt in Ubuntu, Debian, or other myriad Debian variants. You could always compile it from source as well.
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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ruby -e 'z = (1..17).map{"%0.2X"%rand(256)}.join.downcase ; uuid = z[1..8] + "-" + z[9..12] + "-" + z[13..16] + "-" + z[17..33]; puts uuid'
that was wrong, this one should do it:
ruby -e 'z = (1..17).map{"%0.2X"%rand(256)}.join.downcase ; uuid = z[1..8] + "-" + z[9..12] + "-" + z[13..16] + "-" + z[17..20] + "-" + z[21..32]; puts uuid'