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+@node VTY shell
+@comment  node-name,  next,  previous,  up
+@chapter VTY shell
+
+@command{vtysh} is integrated shell of Zebra software.
+
+To use vtysh please specify ---enable-vtysh to configure script.  To use
+PAM for authentication use ---with-libpam option to configure script.
+
+vtysh only searches @value{INSTALL_PREFIX_ETC} path for vtysh.conf which
+is the vtysh configuration file.  Vtysh does not search current
+directory for configuration file because the file includes user
+authentication settings.
+
+Currently, vtysh.conf has only one command.
+
+@example
+!
+username foo nopassword
+!
+@end example
+
+With this set, user foo does not need password authentication for user vtysh.
+With PAM vtysh uses PAM authentication mechanism.
+
+If vtysh is compiled without PAM authentication, every user can use vtysh
+without authentication.