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Issue Type:
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![Bug]() Bug
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Affects Versions:
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1.1.2 |
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Assignee:
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Logback dev list
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Components:
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logback-core |
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Created:
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04/Sep/14 8:33 PM
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Description:
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The :- operator in bash expands the right-hand-side when the left-hand-side is undefined or empty. logback only expands the RHS when the LHS is undefined. Thus, a system property that has been defined but not assigned (e.g., -Ddefined) does not trigger default expansion, because such parameters actually have the empty string as their value.
Chapter 3 of the documentation states that this operator is based on the operator with the same name in Bash. Bash, however, expands on blank:
X=""
echo $
{X:-3}
will echo 3.
I would prefer that logback adopt the same semantics as Bash; but if this is not possible due to backward-compatibility reasons, the documentation should be updated to point out that this differs from Bash for this corner case.
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Environment:
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Scala/java/OSX/Linux
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Project:
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logback
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Labels:
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substitution
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Priority:
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![Trivial]() Trivial
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Reporter:
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Jeffrey Aguilera
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