Thx for the suggestion Justin, but --get_cable_info wasn't recognized after renaming:
> ibdiagnet --get_cable_info
----------
Load Plugins from:
/usr/share/ibdiagnet2.1.1/plugins/
(You can specify more paths to be looked in with "IBDIAGNET_PLUGINS_PATH" env variable)
Plugin Name Result Comment
ibdiagnet: unrecognized option '--get_cable_info'
-E- Failed to parse options, err=Bad input parameter