Print information to the console for how to use RingLogger

Author: mobileoverlord

templates/new/rootfs_overlay/etc/iex.exs

@@ -1,5 +1,18 @@
 # Pull in Nerves-specific helpers to the IEx session
 use Nerves.Runtime.Helpers
 
+if RingLogger in Application.get_env(:logger, :backends, []) do
+  IO.puts """
+  RingLogger is collecting log messages from Elixir and Linux. To see the
+  messages, either attach the current IEx session to the logger:
+
+    RingLogger.attach
+
+  or tail the log:
+
+    RingLogger.tail
+  """
+end
+
 # Be careful when adding to this file. Nearly any error can crash the VM and
 # cause a reboot.