To display help on the imqcmd command, use the -h or -H option, and do not use a subcommand. You cannot get help about specific subcommands.
For example, the following command displays help about imqcmd:
If you enter an imqcmd command line containing the -h or -H option in addition to a subcommand or other options, the Command utility processes only the -h or -H option. All other items on the command line are ignored.