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


       mgetty - smart modem getty


       mgetty [options] ttydevice [gettydefs]


       Mgetty is a ‘‘smart’’ getty replacement, designed to be used with hayes
       compatible data and data/fax modems.  Mgetty knows about modem initial-
       ization,  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 facili-

       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 fax.

       -x <debug level>
              Use  the  given level of verbosity for logging - 0 means no log-
              ging,  9  is   really   noisy.   The   log   file   is   usually

       -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. Var-
              ious  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 follow.

              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 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 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 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 rec-
              ommend 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 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 pro-
              gram 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/nolo-
              gin.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.log.ttyxx"
       (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 5".

       Many of the common problems and solutions are discussed in  the  mgetty
       manual  and  the  FAQ.   Please  see the WWW page at http://alpha.gree- 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) have to be con-
       figured 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)

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