If no channel is given (\-c), the context is added to all channels that were
already enabled. If the session has no channel, a default channel is created.
-Otherwise the context will be added only to the given channel (\-c).
+If \fB\-c, \-\-channel\fP is omitted, but a non-default channel already
+exists within the session, an error is returned. Otherwise the context
+will be added only to the given channel (\-c).
If \fB\-s, \-\-session\fP is omitted, the session name is taken from the .lttngrc
file.
A tracing event is always assigned to a channel. If \fB\-c, \-\-channel\fP is
omitted, a default channel named '\fBchannel0\fP' is created and the event is
-added to it. For the user-space tracer, using \fB\-a, \-\-all\fP is the same as
-using the wildcard "*".
+added to it. If \fB\-c, \-\-channel\fP is omitted, but a non-default
+channel already exists within the session, an error is returned. For the
+user-space tracer, using \fB\-a, \-\-all\fP is the same as using the
+wildcard "*".
If \fB\-s, \-\-session\fP is omitted, the session name is taken from the .lttngrc
file.
If \fB\-s, \-\-session\fP is omitted, the session name is taken from the .lttngrc
file.
+If \fB\-c, \-\-channel\fP is omitted, the default channel name is used.
+If \fB\-c, \-\-channel\fP is omitted, but a non-default channel already
+exists within the session, an error is returned.
+
.B OPTIONS:
.TP
.BR "\-s, \-\-session NAME"
Apply on session name
.TP
+.BR "\-c, \-\-channel NAME"
+Apply on channel name
+.TP
.BR "\-a, \-\-all-events"
Disable all events. This does NOT disable "*" but rather every known
events of the session.