NOME

       login - apre una sessione sul sistema

SINOSSI

       login [-p] [-h host] [nome] [ENV=VAR...]

       login [-p] [-h host] -f nome

       login [-p] -r host

DESCRIZIONE

       The login program is used to establish a new session with the system. It is normally
       invoked automatically by responding to the login: prompt on the user's terminal.  login
       may be special to the shell and may not be invoked as a sub-process. When called from a
       shell, login should be executed as exec login which will cause the user to exit from the
       current shell (and thus will prevent the new logged in user to return to the session of
       the caller). Attempting to execute login from any shell but the login shell will produce
       an error message.

       The user is then prompted for a password, where appropriate. Echoing is disabled to
       prevent revealing the password. Only a small number of password failures are permitted
       before login exits and the communications link is severed.

       If password aging has been enabled for your account, you may be prompted for a new
       password before proceeding. You will be forced to provide your old password and the new
       password before continuing. Please refer to passwd(1) for more information.

       Your user and group ID will be set according to their values in the /etc/passwd file. The
       value for $HOME, $SHELL, $PATH, $LOGNAME, and $MAIL are set according to the appropriate
       fields in the password entry. Ulimit, umask and nice values may also be set according to
       entries in the GECOS field.

       On some installations, the environmental variable $TERM will be initialized to the
       terminal type on your tty line, as specified in /etc/ttytype.

       Può anche essere eseguito uno script di inizializzazione per il proprio interprete dei
       comandi. Fare riferimento alla relativa sezione di manuale per maggiori informazioni su
       questa funzione.

       Un sottosistema di login è indicato dalla presenza del carattere «*» all'inizio della
       shell di login. La directory home impostata sarà utilizzata come root di un nuovo file
       system al quale l'utente accede.

       The login program is NOT responsible for removing users from the utmp file. It is the
       responsibility of getty(8) and init(8) to clean up apparent ownership of a terminal
       session. If you use login from the shell prompt without exec, the user you use will
       continue to appear to be logged in even after you log out of the "subsession".

OPZIONI

       -f
           Non effettua l'autenticazione, l'utente è già autenticato

           Note: In that case, username is mandatory.

       -h
           Nome dell'host remoto per questo login.

       -p
           Non modifica l'ambiente.

       -r
           Attiva il protocollo autologin di rlogin.

       The -r, -h and -f options are only used when login is invoked by root.

AVVISI/CAVEAT

       This version of login has many compilation options, only some of which may be in use at
       any particular site.

       La posizione dei file è soggetta a differenze in base alla configurazione del sistema.

       The login program is NOT responsible for removing users from the utmp file. It is the
       responsibility of getty(8) and init(8) to clean up apparent ownership of a terminal
       session. If you use login from the shell prompt without exec, the user you use will
       continue to appear to be logged in even after you log out of the "subsession".

       As with any program, login's appearance can be faked. If non-trusted users have physical
       access to a machine, an attacker could use this to obtain the password of the next person
       coming to sit in front of the machine. Under Linux, the SAK mechanism can be used by users
       to initiate a trusted path and prevent this kind of attack.

CONFIGURAZIONE

       The following configuration variables in /etc/login.defs change the behavior of this tool:

FILE

       /var/run/utmp
           Elenco delle sessioni attive.

       /var/log/wtmp
           Elenco delle precedenti sessioni di login.

       /etc/passwd
           Informazioni sugli account utente.

       /etc/shadow
           Informazioni sicure sugli account utente.

       /etc/motd
           File di sistema con il messaggio del giorno.

       /etc/nologin
           Impedisce l'accesso al sistema per utenti diversi da root.

       /etc/ttytype
           Elenco di tipi di terminale.

       $HOME/.hushlogin
           Impedisce che vengano mostrati i messaggi di sistema.

       /etc/login.defs
           Configurazione del pacchetto password shadow

VEDERE ANCHE

       mail(1), passwd(1), sh(1), su(1), login.defs(5), nologin(5), passwd(5), securetty(5),
       getty(8).