Just ${xxx:+...} and ${xxx:-...} for now
Signed-off-by: Doug Davis <dug@us.ibm.com>
Upstream-commit: 39908fc6d9a13f0d44196475ba938b6cc352fdbe
Component: engine
Clarify in the docs that ENV is not recursive
Closes#10391
Signed-off-by: Doug Davis <dug@us.ibm.com>
Upstream-commit: 6d66e3e7a5ecb021a9e89c4f85fadecf23e2000c
Component: engine