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We can also use +D/-D to build an optional list of definitions that can be used to preprocess files and as variables in object definitions, as if they where defined in the ``defaults'' environment of the hosts.conf file. Actually there is a little but very important difference, since they are defined before reading the hosts.conf file, these are the only variables that can be used to conditionally preprocess this file.

Esteban Manchado Velázquez 2002-12-13