Provided by:
login_4.1.4.2-1ubuntu2_i386 
NOME
login - begin session on the system
SINOSSI
login [-p] [-h host] [username] [ENV=VAR...]
login [-p] [-h host] -f username
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 users 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.
Allutente viene quindi chiesta la password, se necessario. Durante
questa operazione leco sul terminale è disabilitato per non rivelare la
password. Solo un basso numero di tentativi falliti è permesso prima
che login termini e che la connessione sia rallentata.
Se la scadenza delle password è abilitata per il proprio account, prima
di proseguire ci può essere la richiesta di una nuova password. Il
programma chiederà prima la vecchia password e poi la nuova per poter
continuare. Per maggiori informazioni si faccia riferimento a
passwd(1).
Dopo aver completato correttamente laccesso, vengono mostrati eventuali
messaggi di sistema e si viene informati della presenza di nuova posta.
Si può evitare di visualizzare i messaggi in /etc/motd creando un file
vuoto chiamato .hushlogin nella propria directory di login. Il
messaggio relativo alla presenza di posta è "Cè nuova posta.", "Cè la
solita posta." o "Nessun messaggio di posta." a seconda dello stato
della propria casella di posta.
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.
In alcune installazioni la variabile dambiente $TERM può essere
impostata in base al tipo di terminale della propria connessione, come
specificato in /etc/ttytype.
An initialization script for your command interpreter may also be
executed. Please see the appropriate manual section for more
information on this function.
A subsystem login is indicated by the presence of a "*" as the first
character of the login shell. The given home directory will be used as
the root of a new file system which the user is actually logged into.
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 lautenticazione, lutente è già autenticato
Note: In that case, username is mandatory.
-h
Nome dellhost remoto per questo login.
-p
Non modifica lambiente.
-r
Perform autologin protocol for rlogin.
Le opzioni -r, -h e -f possono essere utilizzate solo quando login
viene invocato da root.
AVVISI/CAVEAT
This version of login has many compilation options, only some of which
may be in use at any particular site.
The location of files is subject to differences in system
configuration.
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, logins 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.
CONFIGURATION
The following configuration variables in /etc/login.defs change the
behavior of this tool:
CONSOLE_GROUPS (string)
List of groups to add to the users supplementary groups set when
logging in on the console (as determined by the CONSOLE setting).
Default is none.
Use with caution - it is possible for users to gain permanent
access to these groups, even when not logged in on the console.
DEFAULT_HOME (boolean)
Indicate if login is allowed if we cant cd to the home directory.
Default in no.
If set to yes, the user will login in the root (/) directory if it
is not possible to cd to her home directory.
ENV_PATH (string)
If set, it will be used to define the PATH environment variable
when a regular user login. The value can be preceded by PATH=, or a
colon separated list of paths (for example /bin:/usr/bin). The
default value is PATH=/bin:/usr/bin.
ENV_SUPATH (string)
If set, it will be used to define the PATH environment variable
when the superuser login. The value can be preceded by PATH=, or a
colon separated list of paths (for example
/sbin:/bin:/usr/sbin:/usr/bin). The default value is
PATH=/bin:/usr/bin.
ERASECHAR (number)
Terminal ERASE character (010 = backspace, 0177 = DEL).
The value can be prefixed "0" for an octal value, or "0x" for an
hexadecimal value.
FAIL_DELAY (number)
Delay in seconds before being allowed another attempt after a login
failure.
FAKE_SHELL (string)
If set, login will execute this shell instead of the users shell
specified in /etc/passwd.
HUSHLOGIN_FILE (string)
If defined, this file can inhibit all the usual chatter during the
login sequence. If a full pathname is specified, then hushed mode
will be enabled if the users name or shell are found in the file.
If not a full pathname, then hushed mode will be enabled if the
file exists in the users home directory.
KILLCHAR (number)
Terminal KILL character (025 = CTRL/U).
The value can be prefixed "0" for an octal value, or "0x" for an
hexadecimal value.
LOGIN_RETRIES (number)
Maximum number of login retries in case of bad password.
This will most likely be overriden by PAM, since the default
pam_unix module has its own built in of 3 retries. However, this is
a safe fallback in case you are using an authentication module that
does not enforce PAM_MAXTRIES.
LOGIN_TIMEOUT (number)
Max time in seconds for login.
LOG_OK_LOGINS (boolean)
Enable logging of successful logins.
LOG_UNKFAIL_ENAB (boolean)
Enable display of unknown usernames when login failures are
recorded.
Note: logging unknown usernames may be a security issue if an user
enter her password instead of her login name.
TTYGROUP (string), TTYPERM (string)
The terminal permissions: the login tty will be owned by the
TTYGROUP group, and the permissions will be set to TTYPERM.
By default, the ownership of the terminal is set to the users
primary group and the permissions are set to 0600.
TTYGROUP can be either the name of a group or a numeric group
identifier.
If you have a write program which is "setgid" to a special group
which owns the terminals, define TTYGROUP to the group number and
TTYPERM to 0620. Otherwise leave TTYGROUP commented out and assign
TTYPERM to either 622 or 600.
TTYTYPE_FILE (string)
If defined, file which maps tty line to TERM environment parameter.
Each line of the file is in a format something like "vt100 tty01".
USERGROUPS_ENAB (boolean)
If set to yes, userdel will remove the users group if it contains
no more members, and useradd will create by default a group with
the name of the user.
FILE
/var/run/utmp
Elenco delle sessioni attive
/var/log/wtmp
Elenco delle precedenti sessioni.
/etc/passwd
informazioni sugli account utente.
/etc/shadow
Informazioni sicure sugli account di utenti.
/etc/motd
System message of the day file.
/etc/nologin
Inibisce l\accesso al sistema per utenti diversi da root.
/etc/ttytype
Elenco di tipi di terminale.
$HOME/.hushlogin
#-#-#-#-# #-#-#-#-# Non fa mostrare i messaggi di sistema.
#-#-#-#-# #-#-#-#-# Impedisce che vengano mostrati i messaggi di
sistema.
/etc/login.defs
Shadow password suite configuration.
VEDERE ANCHE
mail(1), passwd(1), sh(1), su(1), login.defs(5), nologin(5), passwd(5),
securetty(5), getty(8).