mingetty man page on SuSE
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MINGETTY(8) Linux Programmer's Manual MINGETTY(8)
NAME
mingetty - minimal getty for consoles
SYNOPSIS
/sbin/mingetty [--noclear] [--nonewline] [--noissue] [--nohangup]
[--noreset] [--no-hostname] [--long-hostname] [--login login_binary]
[--logopts "login_options"] [--nice number] [--delay number]
[--chdir /home] [--chroot /chroot] [--autologin user] [--old] tty
[term]
DESCRIPTION
mingetty is a minimal getty for use on virtual consoles. Unlike
agetty(8), mingetty is not suitable for serial lines. For this purpose
the usage of mgetty(8) is recommend.
OPTIONS
--noclear
Do not clear the screen before prompting for the login name (the
screen is normally cleared).
--noreset
By default the terminal settings will be initialized to some
sane default values. With this option the terminal settings
will not be changed.
--nonewline
Do not print a newline before writing out /etc/issue.
--noissue
Do not output /etc/issue.
--nohangup
Do not call vhangup() to disable writing to this tty by other
applications.
--no-hostname
By default the hostname will be printed. With this option
enabled, no hostname at all will be shown.
--long-hostname
By default the hostname is only printed until the first dot.
With this option enabled, the full text from gethostname() is
shown.
--login login_binary
Use the login_binary to log in instead of the default
/bin/login.
--logopts "login_options"
Options that are passed to the login program. \\u is replaced
by the login name. Defaults to "-- \\u", which is suitable for
/bin/login. Please read the SECURITY NOTICE below if you want
to use this.
--nice 10
Change the priority by calling nice().
--delay 5
Sleep this many seconds after startup of mingetty.
--chdir /home
Change into this directory before calling the login prog.
--chroot /chroot
Call chroot() with this directory name.
--autologin username
Log the specified user automatically in without asking for a
login name and password. Check the -f option from /bin/login for
this.
--old Do not reset the terminal line to standard settings and do not
hangup the /dev/vcs and /dev/vcsa virtual console memory devices
which may remain from a former session. This hangup requires
access to the /proc file system because the linux kernel does
not have a revoke() system call. Please read the SECURITY
NOTICE below if you want to use this.
SECURITY NOTICE
If you use the --login and --logopts options, be aware that a malicious
user may try to enter lognames with embedded options, which then get
passed to the used login program. mingetty does check for a leading -
and makes sure the logname gets passed as one parameter (so embedded
spaces will not create yet another parameter), but depending on how the
login binary parses the command line that might not be sufficient.
Check that the used login program can not be abused this way.
Some programs use -- to indicate that the rest of the commandline
should not be interpreted as options. Use this feature if available by
passing -- before the username gets passed by \\u.
If you use the --old be aware that remaining opened or memory mapped
/dev/vcs<#> or /dev/vcsa<#> virtual console memory devices provide all
infomation of the corresponding terminal line /dev/tty<#> to a possible
attacker.
ISSUE ESCAPES
mingetty recognizes the following escapes sequences which might be
embedded in the /etc/issue file:
\d insert current day (localtime),
\l insert line on which mingetty is running,
\m inserts machine architecture (uname -m),
\n inserts machine's network node hostname (uname -n),
\o inserts domain name,
\r inserts operating system release (uname -r),
\t insert current time (localtime),
\s inserts operating system name,
\u resp. \U the current number of users which are currently logged
in. \U inserts "n users", where as \u only inserts "n".
\v inserts operating system version (uname -v).
EXAMPLE
"Linux eos i386 #1 Tue Mar 19 21:54:09 MET 1996" was produced by
putting "\s \n \m \v" into /etc/issue.
FILES
/etc/issue,
/var/run/utmp,
/etc/inittab.
SEE ALSO
mgetty(8),
agetty(8),
inittab(5),
vcs(8).
AUTHOR
Copyright © 1996 Florian La Roche <florian@suse.de> or <flo‐
rian@jurix.jura.uni-sb.de>.
Copyright © 1999-2002 Werner Fink <feedback@suse.de>. Man-page written
by David Frey <David.Frey@eos.lugs.ch>, Florian La Roche, and updated
by Werner Fink.
SuSE 29 May 2007 MINGETTY(8)
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