.B "1\-8"
probe selection.
.TP
+.BR "\-g, \-\-probe\-group "<probe\ group>
+Specify the probe group to operate on.
+
+Some devices organize probes into groups, the settings of which can
+only be changed as a group. The list of probe groups, if any, is displayed
+with the \-\-show command.
+.TP
.BR "\-t, \-\-triggers " <triggerlist>
A comma-separated list of triggers to use, of the form
.BR "<probe>=<trigger>" .