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AI-generatedRexx ADDRESS UNIX: requesting explicit handling of missing execute permission
The ADDRESS UNIX instruction lets a Rexx script invoke a host command and capture its exit code in RC. When the target file lacks execute permission, the shell returns a non‑zero RC, but the language does not map this to a distinct SIGNAL ON ERROR condition nor expose the underlying errno (e.g., EACCES). Because RC values overlap with other failure modes and
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