Provided by: login_4.0.13-7ubuntu3_i386
login - begin session on the system
login [-p] [username] [ENV=VAR...]
login [-p] [-h host] [-f username]
login [-p] -r host
login 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. Typically, login is treated by the shell as
exec login which causes the user to exit from the current shell.
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.
After a successful login, you will be informed of any system messages
and the presence of mail. You may turn off the printing of the system
message file, /etc/motd, by creating a zero-length file in your login
directory. The mail message will be one of "You have new mail.", "You
have mail.", or "No Mail. "according to the condition of your mailbox.
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
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".
-f Do not perform authentication, user is preauthenticated.
-h Name of the remote host for this login.
-p Preserve environment.
-r Perform autologin protocol for rlogin.
The -r, -h and -f options are only used when login is invoked by root.
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
list of current login sessions
list of previous login sessions
user account information
secure user account information
system message of the day file
prevent non-root users from logging in
list of terminal types
suppress printing of system messages
mail(1), passwd(1), sh(1), su(1), login.defs(5), nologin(5), passwd(5),
Julianne Frances Haugh <email@example.com>