// preferably in during `init()`.
func RegisterHelpSubSys(helpKVSMap map[string]HelpKVS) {
	maps.Copy(HelpSubSysMap, helpKVSMap)
}

// HelpDeprecatedSubSysMap - help for all deprecated sub-systems, that may be
// removed in the future.
var HelpDeprecatedSubSysMap = map[string]HelpKV{}

// RegisterHelpDeprecatedSubSys - saves input help KVS for deprecated
// sub-systems globally. Should be called only once at init.

		return Help{}, config.Errorf("invalid number of arguments %s", subSys)
	}

	subSys = subSystemValue[0]

	subSysHelp, ok := config.HelpSubSysMap[""].Lookup(subSys)
	if !ok {
		subSysHelp, ok = config.HelpDeprecatedSubSysMap[subSys]
		if !ok {
			return Help{}, config.Errorf("unknown sub-system %s", subSys)
		}
	}

	h, ok := config.HelpSubSysMap[subSys]
	if !ok {