- environment variable
- ROS_HOME, [1], [2], [3], [4], [5], [6]
- ROS_LOG_DIR, [1], [2]
- ROS_PACKAGE_PATH, [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12]
- ROS_ROOT, [1], [2], [3], [4], [5], [6], [7], [8], [9], [10]
- ROS_TEST_RESULTS_DIR, [1], [2], [3]
- expand_rule() (in module rospkg.distro)
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- expand_to_packages() (in module rospkg)
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