chennaji9 commented on PR #6811:
URL: 
https://github.com/apache/rocketmq-dashboard/pull/6811#issuecomment-6520027844

   Re-verified the guard cannot over-reject: a value that merely starts with a 
dash (e.g. `--bin-dir -tools/bin`) still parses as a value, because only the 
installer's own option words are treated as a missing-value indicator. The 
usage text now appears exactly where the old script used to die with `$2: 
unbound variable`.


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