podman/docs/source/markdown/options/env-merge.md

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####> This option file is used in:
####> podman create, run
####> If file is edited, make sure the changes
####> are applicable to all of those.
#### **--env-merge**=*env*
Preprocess default environment variables for the containers. For example
if image contains environment variable `hello=world` user can preprocess
it using `--env-merge hello=${hello}-some` so new value will be `hello=world-some`.