$ lttng start
-Tracing is in progress at this point and traces will be written in
-$HOME/lttng-traces/mysession-<date>-<time>/ust/<procname>-<pid>-<date>-<time>
+Tracing is in progress at this point and traces will be written in the session
+directory.
NOTE: It will start tracing for *all* domain(s).