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vcgencmd: tweak usage #673

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vcgencmd: tweak usage #673

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@ghost ghost commented Jan 9, 2021

This PR depends on #663 also integrating, since it adds mention of the existence of a man page to the usage message (basic help output).

Tweaks are:

  1. Don't mention vcgencmd commands - not needed now we have a man page.
  2. Mention the man page in usage message, since it's a new addition, for improved discoverability.
  3. Tweak what happens in the case where the user tried to invoke a gencmd that doesn't exist: also display usage.

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