/usr/share/roslaunch/resources/example-env-substutition.xml is in python-roslaunch 1.11.16-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | <launch>
<param name="example_env_param" value="$(env VALUE)" />
</launch>
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