Jose Luis Trivino wrote:
>         He estado revisando todos los ficheros de /etc y no he
> encontrado nada que sirva para algo parecido. 

No viene de serie, lo tienes que crear t�

De man shutdown:

OPTIONS
       -a     Use /etc/shutdown.allow.

...

  If shutdown  is  called with the -a argument (add this to the
invocation of shutdown in /etc/inittab), it checks to  see if  the file
/etc/shutdown.allow is present.  It then compares the login names in
that file with the list of people that are logged in in a virtual
console  (from /var/run/utmp). Only if one of those authorized  users 
or root  is  logged  in,  it  will proceed. Otherwise it will write the
message

 shutdown: no authorized users logged in

Saludos,


-- 
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Agust�n Mart�n Domingo, Dpto. de F�sica, ETS Arquitectura Madrid, 
(U. Polit�cnica de Madrid)  tel: +34 91-336-6536, Fax: +34 91-336-6554, 
email:[EMAIL PROTECTED], http://corbu.aq.upm.es/~agmartin/welcome.html

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