Just looking/scanning the latest (4.2.2) Spectrum Scale Command (and Programming) Reference I only found a few commands that officially are documented as supporting a -Y option: mmnfs, mmsmb, mmuserauth.
But as many of you have discovered, -Y is accepted and yields "interesting" output for many of the mmXXXX commands. Moreover the output *seems to* have easily discernible patterns that can be parsed by simple programs. I believe there is no guarantee that the exact command output formats will not change from release to release, so, as a practical matter, if you're going to parse command output, you're probably better off parsing the -Y output, even if that is not officially supported.
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