The workspace actions you can take with this command are list, delete, and rename. If you want to list your workspaces, use the following: 
dv workspace
To rename your current workspace: 
dv workspace --rename <new-name>
To delete the specified workspace: 
dv <workspace_id> --delete
You cannot delete the current workspace. The <workspace_id> is not the workspace name but the id that starts with dv.ws.xxxxx To any action, you can add the -f flag to avoid getting asked to confirm. For more information about workspaces in Diversion, visit the Repositories, Branches, and Workspaces page.