Introduction
DVO (the Desktop Virtual Observatory) is system for manipulating
collections of images and measurements related to astronomical
objects. The DVO system consists of several programs which insert
data in the database system, or manipulate data in the database. One
of these is the DVO shell, which provides a command-line
driven, programmable user interface to the objects and measurements in
the database. The DVO shell is based on the Opihi shell, which
provides the tools to manipulate and display data in various
representations. The DVO shell adds to this basic command set a
collection of functions which provide direct access to the contents of
the DVO database tables.