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LOGIN(1) OpenBSD Reference Manual LOGIN(1)
login - log into the computer
login [-fp] [-h hostname] [user]
The login utility logs users (and pseudo-users) into the computer system.
If no user is specified, or if a user is specified and authentication of
the user fails, login prompts for a user name. Authentication of users
is done via passwords. Alternately, the user can enter the password
"s/key", in which case S/Key authentication of users is performed, as de-
scibed in skey(1). S/Key is a Trademark of Bellcore.
The options are as follows:
-f The -f option is used when a user name is specified to indicate
that proper authentication has already been done and that no
password need be requested. This option may only be used by the
super-user or when an already logged in user is logging in as
The -h option specifies the host from which the connection was
received. It is used by various daemons such as telnetd(8).
This option may only be used by the super-user.
-p By default, login discards any previous environment. The -p op-
tion disables this behavior.
If the file /etc/nologin exists, login displays its contents to the user
and exits. This is used by shutdown(8) to prevent users from logging in
when the system is about to go down.
If the file /etc/fbtab exists, login changes the protection and ownership
of certain devices specified in this file.
If the file /var/log/failedlogin exists, login will record failed login
attempts in this file.
Immediately after logging a user in, login displays the system copyright
notice, the date and time the user last logged in, the date and time of
the last unsuccessful login (if the file /var/log/failedlogin exists),
the message of the day as well as other information. If the file
``.hushlogin'' exists in the user's home directory, all of these messages
are suppressed. This is to simplify logins for non-human users, such as
uucp(1). login then records an entry in the wtmp(5) and utmp(5) files
and executes the user's command interpreter.
login enters information into the environment (see environ(7)) specify-
ing the user's home directory (HOME), command interpreter (SHELL), search
path (PATH), terminal type (TERM), and user name (both LOGNAME and USER).
The standard shells, csh(1) and sh(1), do not fork before executing the
/etc/fbtab changes device protections
/etc/nologin disallows logins
/var/run/utmp current logins
/var/log/lastlog last login account records
/var/log/wtmp login account records
/var/log/failedlogin failed login account records
/var/mail/user system mailboxes
.hushlogin makes login quieter
chpass(1), passwd(1), rlogin(1), skey(1), getpass(3), fbtab(5),
A login utility appeared in Version 6 AT&T UNIX.
OpenBSD 2.6 May 5, 1994 2
Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.
(Corrections, notes, and links courtesy of RocketAware.com)
FreeBSD Sources for login(1)
OpenBSD sources for login(1)
Up to: Remote Process Creation and Control - Methods of starting and controlling processes remotely. (telnet, login, rexec, et al.)
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