Provided by: mgetty_1.2.1-1.2_amd64 bug


       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 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.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 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,  \b,
              \v,  \f, \t for newline, carriage return, bell, backspace, vertical tab, form feed,
              and tab, respectively.  \P 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
              will output the port speed.  \s, \m, \V, \R represent  the  operating  system,  the
              hardware  name, the OS version, the OS release.  \N and \U give the number of users
              currently 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 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 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 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-

       -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 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 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'

              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/mg_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 5".

       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) have  to  be  configured  by  changing  the  source  and

       Users never read manuals...


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


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