Приоритет оператора перенаправления в Bash [дубликат]

Опция -X позволяет переадресацию X11:

-X   Enables X11 forwarding.  This can also be specified on a per-host
     basis in a configuration file.

     X11 forwarding should be enabled with caution.  Users with the
     ability to bypass file permissions on the remote host (for the
     user's X authorization database) can access the local X11 display
     through the forwarded connection.  An attacker may then be able
     to perform activities such as keystroke monitoring.

     For this reason, X11 forwarding is subjected to X11 SECURITY
     extension restrictions by default.  Please refer to the ssh -Y
     option and the ForwardX11Trusted directive in ssh_config(5) for
     more information.

Опция -Y, соответствующая директиве ForwardX11Trusted в ssh_config (5), еще менее безопасна, поскольку она удаляет расширение X11 SECURITY

-Y      Enables trusted X11 forwarding.  Trusted X11 forwardings are not
        subjected to the X11 SECURITY extension controls.

Более безопасно использовать -x

-x   Disables X11 forwarding.