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Added small section about default values #11956

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Aug 6, 2019
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Added small section about default values #11956

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7 changes: 7 additions & 0 deletions components/dotenv.rst
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Expand Up @@ -149,6 +149,13 @@ Use environment variables in values by prefixing variables with ``$``:
its value will depend on the ``DB_USER`` value defined in other files
instead of the value defined in this file.

Define a default value in case the environment variable is not set:

.. code-block:: terminal

DB_USER=
DB_PASS=${DB_USER:-root}pass # results in DB_PASS=rootpass

Embed commands via ``$()`` (not supported on Windows):

.. code-block:: terminal
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