---json
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---
====== Os Environment Variables ======


===== About =====
Os Environment Variables can be used to set the value:
  * of [[:docs:conf:global_env|global attribute]]
  * of an attribute with a [[#template|template value]]

===== Secret =====

Environment variables are considered [[secret|secret]] only if their names make it [[secret#are_environment_variables_considered_secret|obvious by containing a pattern]]



===== Example =====

==== Global Attribute ====
 
If you want to set the [[docs:common:environment|execution environment]], you can
set it on Linux as:

<code bash>
env=prod
# or
tabul_env=prod
# or
TABUL_ENV=prod
</code>


==== Template ====
They can also be used as [[:docs:conf:template]] in [[:docs:common:manifest|manifest]]
<code yaml>
connections:
  connectionName:
    parameter1: ${MY_OS_ENV}
</code>