HP ProCurve 6400cl Series Management And Configuration Manual page 66

Using the Command Line Interface (CLI)
Using the CLI
Figure 4-7.Example of How To Display Help for a Specific Command
4-12
Note that trying to list the help for an individual command from a privilege
level that does not include that command results in an error message. For
example, trying to list the help for the interface command while at the global
configuration level produces this result:
HPswitch# speed-duplex help
Invalid input: speed-duplex