Task Scheduler
From Joomla! Documentation
Limit Task to Command-line Interface Only[edit]
To implement a task, which is executed via the command-line interface (CLI) only, add this code to the task XML:
<fieldset name="aside">
<field name="cli_exclusive" type="hidden" default="1" />
</fieldset>
The fieldset must be a direct child of the form
<form>
<fieldset name="aside">
<field name="cli_exclusive" type="hidden" default="1" />
</fieldset>
...