Add env vars usage idiom for writing types
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@ -331,6 +331,19 @@ So when you generate a script with the following content, it will work:
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fi
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Environment variable usage idiom
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--------------------------------
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In type scripts you can support environment variables with default values if
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environment variable is unset or null by using **${parameter:-[word]}**
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parameter expansion.
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Example using mktemp in a portable way that supports TMPDIR environment variable.
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.. code-block:: sh
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tempfile=$(mktemp "${TMPDIR:-/tmp}/cdist.XXXXXXXXXX")
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Log level in types
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------------------
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cdist log level can be accessed from __cdist_log_level variable.One of:
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