NAME
llooggiinn - log into the computer
SYNOPSIS
llooggiinn [-ffpp] [-hh hostname] [user]
DESCRIPTION
The llooggiinn 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, llooggiinn prompts for a user name. Authentication of users is done via passwords. The options are as follows:-ff The -ff 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 thesuper-user or when an already logged in user is logging in as
themselves.-hh The -hh 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.
-pp By default, llooggiinn discards any previous environment. The -pp
option disables this behavior.If the file /etc/nologin exists, llooggiinn dislays 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. Immediately after logging a user in, llooggiinn displays the system copyright notice, the date and time the user last logged in, the message of the dayas well as other information. If the file ``.hushlogin'' exists in the
user's home directory, all of these messages are suppressed. This is tosimplify logins for non-human users, such as uucp(1). LLooggiinn 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)) specifying the user's home directory (HOME), command interpreter (SHELL), searchpath (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 llooggiinn utility. FILES/etc/motd message-of-the-day
/etc/nologin disallows logins
/var/run/utmp current logins
/var/log/lastlog last login account records
/var/log/wtmp login account records
/var/mail/user system mailboxes.hushlogin makes login quieter
SEE ALSO
chpass(1), passwd(1), rlogin(1), getpass(3), utmp(5), environ(7),
HISTORY A llooggiinn appeared in Version 6 AT&T UNIX. 4th Berkeley Distribution May 5, 1994 4th Berkeley Distribution