+option:-e 'READER', option:--viewer='READER'::
+ Use the trace reader 'READER' to read the traces.
++
+'READER' is the absolute path to the reader command to use, and it can
+contain command arguments as well. The `view` command passes the trace
+directory path to read to the 'READER' command as its last argument.
++
+Without this option, the `view` command uses man:babeltrace2(1) if it's
+available. Otherwise, it tries to use man:babeltrace(1).