It seems that someone should bring up this issue on the zfs list. All of the proposed solutions have involved 'tail -1'. This is a non-scalable solution which does not work efficiently for any number of snapshots. Since it is such a common requirement, zfs should provide an efficient way to obtain both the first and last snapshots matching a specification.

Bob
--
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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