Logging with insufficient arguments
logging
ERR "Insufficient arguments for 'logging' command"

Get logging level with extra arguments
logging show foo bar
ERR "Unexpected arguments for 'logging show' command; got 4, expected 2 or 3"

Set logging level with insufficient arguments
logging set
ERR "Unexpected arguments for 'logging set' command; got 2, expected 3 or 4"

Invalid logging subcommand
logging foo
ERR "Unknown subcommand 'foo' for 'logging' command"