mgetty(8)                     mgetty+sendfax manual                    mgetty(8)

       mgetty - smart modem getty

       mgetty [options] ttydevice [gettydefs]

       Mgetty is a ``smart'' getty replacement, designed for use 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

       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.texi).

       -k <space>
              Tells mgetty to leave <space> kbytes free on disk when receiving a

       -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, \g, \f, for newline, bell, and form feed,
              respectively.  \v and \r will expand to the OS version and
              release.  \P, \l and \L will expand to the tty name ("ttyS0").  \Y
              will give the Caller ID, \I the "CONNECT foobar" string returned
              by the modem, and \S or \b will output the port speed.  \N and \U
              give the number of users currently logged in.  \C will be changed
              into the result of ctime(), and \D or \d and \t or \T will output
              the date and time, respectively. Finally, \<digit> will use digit
              as octal/decimal/hexadecimal representation of the character to

              The default prompt is specified at compile time.

       -n #   Tells mgetty to pick up the phone after the #th RING. Default is

       -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 substitutions 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 initialization 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 values 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
              supports 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 identification. Not used for
              data modems.

       -b     Open the port in blocking mode. Best used in combination with
              "-r". This is the default if mgetty is called as getty.  You may
              want to use this if you want to use 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
              included 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 old modems exist which
              cannot use a fixed (locked) port speed.

       -m 'expect send ...'
              Set the "chat sequence" used to initialize the modem. For an empty
              expect part, use empty double quotes (""). Since the sequence
              contains spaces, you have to enclose all of it in single
              quotes(''). Example:

              mgetty -m '"" ATH0 OK'

              Main configuration file.

              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.

              controls acceptance/denial of incoming calls based on the caller's
              number.  Available only if you have "caller ID" and your modem
              supports it.

              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/nologin.ttyxx
              via the cron program at the appropriate time.

              will be printed after a connection is established, and before the
              with the '-i' option.

              Debug log file, see below.

       If mgetty doesn't work the way it should, the main source of diagnostic
       data is the log file.  It can be found in "/var/log/mgetty.ttyxx.log"
       (for the mgetty process handling "ttyxx").  If it doesn't contain enough
       details, enhance the log level with the '-x' option to mgetty, e.g. "-x

       Many of the common problems and solutions are discussed in the mgetty
       manual and the FAQ.  Please see the WWW page at for both.

       Not all of mgetty configuration can be done at run-time yet. Things like
       flow control and file paths (log file / lock file) must be configured by
       changing the source and recompiling.

       Users never read manuals...

       g32pbm(1), sendfax(8), getty(8), mgettydefs(4),

       mgetty is Copyright (C) 1993 by Gert Doering, <>.

greenie                       27 Oct 93 - 21 Jul 98                    mgetty(8)