Github user geomacy commented on a diff in the pull request:
https://github.com/apache/brooklyn-docs/pull/80#discussion_r68231674
--- Diff: guide/yaml/custom-entities.md ---
@@ -82,6 +82,18 @@ to be specified up one level, alongside the type.
However config keys which are *not* declared on the type *must* be
declared in the `brooklyn.config` block.
+### Passing custom variables
+
+Blueprint scripts can be parametrized through environment variables,
making them reusable in different use-cases.
+Define the variables in the `env` block and then reference them using the
standard bash notation:
--- End diff --
or 'shell.env' (is there any difference? what's preferred?)
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