Question:
- How to create a new host group and add Control-M Agent Node ID to it using a command line?
- How to run ctmhostgrp utility in command line?
 

Answer:
This is the syntax and usage to run ctmhostgrp utility in command line:
usage: ctmhostgrp [
-LIST |
-EDIT -HOSTGRP -APPLTYPE [ -VIEW | -ADD | -DELETE ] |
-DELETE
                               ]

Following are some examples for you:

1. To add a new hostgroup and add Control-M Agent into the hostgroup:
Run:
ctmhostgrp -EDIT -HOSTGRP GENEGRP -APPLTYPE OS -ADD mongoose

Result:
 insert of new application group completed successfully
 insert completed successfully

2. To list all hostgroup created:
Run:
ctmhostgrp -LIST

Result:
List of Groups                                            Application type
==================================================        ================
pepe                                                      OS
pepa                                                      OS
GENEGRP                                                   OS

3. To view all the Control-M Agent in a specific hostgroup:
Run:
ctmhostgrp -EDIT -HOSTGRP GENEGRP -APPLTYPE OS -VIEW

Result:
HostGroup Name                                       Host ID
============================================================
 GENEGRP                                            mongoose
 

The following video demonstrates this solution:

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Note: 
- Control-M Automation API can be used to define HostGroup and add Control-M Agents into HostGroup as well. For example to adding an Agent to Hostgroup can be done by config server:hostgroup:agent::add, for details please refer to 
https://docs.bmc.com/docs/automation-api/918/services-783053199.html