Make "terminal length <0-512>" command work in vtysh.
diff --git a/lib/command.c b/lib/command.c
index 8b6ae3d..088ad38 100644
--- a/lib/command.c
+++ b/lib/command.c
@@ -3300,8 +3300,11 @@
     }
   install_element (ENABLE_NODE, &show_startup_config_cmd);
   install_element (ENABLE_NODE, &show_version_cmd);
-  install_element (ENABLE_NODE, &config_terminal_length_cmd);
-  install_element (ENABLE_NODE, &config_terminal_no_length_cmd);
+  if (terminal)
+  {
+    install_element (ENABLE_NODE, &config_terminal_length_cmd);
+    install_element (ENABLE_NODE, &config_terminal_no_length_cmd);
+  }
 
   if (terminal)
     install_default (CONFIG_NODE);