Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.
This program is mostly useful for a firewire tuner or set-top box with an AV interface. Use it to issue a command (panelctl <command>) or to change channels on the tuner (panelctl <channel>). To get a list of legal commands, use the --commands switch.
By default, panelctl will control the first Motorola STB on the firewire chain. This will only work with some Motorola STBs. To control any other STB, or to control multiple STBs, specify the GUID or both the spec_id and software version for the desired STB. This can be found out by running "panelctl -v -g 1 1". Because there won't be a STV with GUID of 1, it will run through all possible devices and print the info for each one. Once the GUID, or the spec_id and sw_version of the desired device has been learned, it can be used in following commands, e.g. "panelctl -g 0x123456 666". Generally, it will be a better approach to use guid, since this will be unique to each STB.
should give you access to the complete manual.