pluginunload name
The pluginunload subcommand unloads the plug-in specified by the name parameter. The name parameter should specify a name of plug-in that is currently loaded.
The pluginunload subcommand can be run only while the dbx program is running.
pluginunload sample
See the plugin subcommand and the pluginload subcommand. Also see the topic on developing for the dbx plug-in framework in z/OS UNIX System Services Programming Tools.