mgetty(8)
NAME
mgetty - smart modem getty
SYNOPSIS
mgetty [options] ttydevice [gettydefs]
DESCRIPTION
Mgetty is a ``smart'' getty replacement, designed to be
used with hayes compatible data and data/fax modems.
Mgetty knows about modem initialization, manual modem
answering (so your modem doesn't answer if the machine
isn't ready), UUCP locking (so you can use the same device
for dial-in and dial-out). Mgetty provides very extensive
logging facilities.
This manpage doesn't try to detail mgetty setup in detail,
it just lists the most important options. For detailed
instructions, see the info file mgetty.info (mgetty.texi).
OPTIONS
-k <<space>>
Tells mgetty to leave <space> kbytes free on disk
when receiving a fax.
-x <<debug level>>
Use the given level of verbosity for logging - 0
means no logging, 9 is really noisy. The log file
is usually /tmp/log_mg.<device>
-s <<speed>>
Set the port speed to use, e.g. "-s 19200".
-r Tells mgetty that it is running on a direct line.
UUCP locking is done, but no modem initialization
whatsoever.
-p <<login prompt>>
Use the given string to prompt users for their
login names. Various tokens are allowed in this
string. These tokens are: @ for the system name,
\n, \r, \g, \v, \f, \t for newline, carriage
return, bell, vertical tab, form feed, and tab,
respectively. \P and \L will expand to the tty name
("ttyS0"). \I will give the "CONNECT foobar" string
returned by the modem, and \S will output the port
speed. \N and \U give the number of users cur-
rently logged in. \C will be changed into the
result of ctime(), and \D and \T will output the
date and time, respectively. Finally, \<digit> will
use digit as octal/decimal/hexadecimal representa-
tion of the character to follow.
The default prompt is specified at compile time.
-n # Tells mgetty to pick up the phone after the #th
RING. Default is 1.
-R <<t>> Tells mgetty to go into "ringback" (aka "ring-
twice") mode. That means: the first call is never
answered, instead the caller has to hang up after
the phone RINGs, wait 30 seconds, and then call
again in the next <t> seconds for mgetty to pick
up. If no call comes, mgetty will exit.
I do not really recommend using this, better get a
second phone line for the modem.
-i <<issue file>>
Output <issue file> instead of /etc/issue before
prompting for the user name. The same token substi-
tutions as for the the login prompt are done in
this file.
-D Tells mgetty that the modem is to be treated as a
DATA modem, no fax initalization is attempted.
-F Tells mgetty that DATA calls are not allowed and
the modem should be set to Fax-Only.
-C <<class>>
Tells mgetty how to treat the modem. Possible val-
ues for <class> are "auto" (default, try to find
out whether the modem supports fax), "cls2" (use
the class 2 fax command set, even if the modem sup-
ports class 2.0), "c2.0" (use the class 2.0 fax
command set), "data" (data only, exactly as the -D
switch).
-S <<g3 file>>
If a call comes in and requests fax polling, mgetty
will send the named file. Note: not all fax modems
support poll sending.
-I <<fax id>>
Use the given fax station ID for fax identifica-
tion. Not used for data modems.
-b Open the port in blocking mode. Best used in combi-
nation with "-r". This is the default if mgetty is
called as getty. You may want to use this if you
want to make use of the two-device / kernel-locking
scheme of the Linux and SunOS operating systems
(/dev/ttyS.. and /dev/cua..). I do not recommend
it, it's just include for completeness, and to be
able to use mgetty as a full-featured getty
replacement.
-a Use autobauding. That is, after a connection is
made, mgetty parses the "CONNECT foo" response code
of the modem and sets the port speed to the first
integer found after the "CONNECT" string, "foo" in
this example. You need this if your modem insist on
changing its DTE speed to match the line speed. I
recommend against using it, better leave the port
speed locked at a fixed value. The feature is
included because there exist old modems that cannot
use a fixed (locked) port speed.
-m 'expect send ...'
Set the "chat sequence" that is used to initialize
the modem. For an empty expect part, use empty dou-
ble quotes (""). Since the sequence contains
spaces, you have to enclose all of it in single
quotes(''). Example:
mgetty -m '"" ATH0 OK'
FILES
/etc/mgetty+sendfax/login.config
controls whether (and when) mgetty should call some
other program for user login instead of /bin/login.
How this is done is explained in this file.
/etc/mgetty+sendfax/dialin.config
controls acceptance/denial of incoming calls based
on the caller's number. Available only if you have
"caller ID" and your modem supports it.
/etc/nologin.ttyxx
controls whether mgetty should pick up the phone
upon incoming calls. If the file exists, calls are
completely ignored. You can use this, for example,
to stop mgetty during day time, and let it pick up
at night only, by creating and removing /etc/nolo-
gin.ttyxx via the cron program at the appropriate
time.
BUGS
Not all of mgetty configuration can be done at run-time
yet. Things like flow control and file paths (log file /
lock file) have to be configured by changing the source
and recompiling.
Users never read manuals...
SEE ALSO
g32pbm(1) sendfax(8) getty(8) mgettydefs(4)
mgetty.info
AUTHOR
mgetty is Copyright (C) 1993 by Gert Doering, <gert@gree-
nie.muc.de>.