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GETTYTAB(5) FreeBSD File Formats Manual GETTYTAB(5)


[править] NAME

    gettytab -- terminal configuration data base

[править] SYNOPSIS



    The gettytab file is a simplified version of the termcap(5) data base
    used to describe terminal lines.  The initial terminal login process
    getty(8) accesses the gettytab file each time it starts, allowing simpler
    reconfiguration of terminal characteristics.  Each entry in the data base
    is used to describe one class of terminals.
    There is a default terminal class, default, that is used to set global
    defaults for all other classes.  (That is, the default entry is read,
    then the entry for the class required is used to override particular set-


    Refer to termcap(5) for a description of the file layout.  The default
    column below lists defaults obtained if there is no entry in the table
    obtained, nor one in the special default table.
    Name    Type    Default           Description
    ac      str     unused            expect-send chat script for modem
    al      str     unused            user to auto-login instead of prompting
    ap      bool    false             terminal uses any parity
    bk      str     0377              alternate end of line character (input
    c0      num     unused            tty control flags to write messages
    c1      num     unused            tty control flags to read login name
    c2      num     unused            tty control flags to leave terminal as
    ce      bool    false             use crt erase algorithm
    ck      bool    false             use crt kill algorithm
    cl      str     NULL              screen clear sequence
    co      bool    false             console - add `\n' after login prompt
    ct      num     10                chat timeout for ac and ic scripts
    dc      num     0                 chat debug bitmask
    de      num     0                 delay secs and flush input before
                                      writing first prompt
    df      str     %+                the strftime(3) format used for %d in
                                      the banner message
    ds      str     `^Y'              delayed suspend character
    dx      bool    false             set DECCTLQ
    ec      bool    false             leave echo OFF
    ep      bool    false             terminal uses even parity
    er      str     `^?'              erase character
    et      str     `^D'              end of text (EOF) character
    ev      str     NULL              initial environment
    f0      num     unused            tty mode flags to write messages
    f1      num     unused            tty mode flags to read login name
    f2      num     unused            tty mode flags to leave terminal as
    fl      str     `^O'              output flush character
    hc      bool    false             do NOT hangup line on last close
    he      str     NULL              hostname editing string
    hn      str     hostname          hostname
    ht      bool    false             terminal has real tabs
    hw      bool    false             do cts/rts hardware flow control
    i0      num     unused            tty input flags to write messages
    i1      num     unused            tty input flags to read login name
    i2      num     unused            tty input flags to leave terminal as
    ic      str     unused            expect-send chat script for modem
    if      str     unused            display named file before prompt, like
    ig      bool    false             ignore garbage characters in login name
    im      str     NULL              initial (banner) message
    in      str     `^C'              interrupt character
    is      num     unused            input speed
    kl      str     `^U'              kill character
    l0      num     unused            tty local flags to write messages
    l1      num     unused            tty local flags to read login name
    l2      num     unused            tty local flags to leave terminal as
    lm      str     login:            login prompt
    ln      str     `^V'              ``literal next character
    lo      str     /usr/bin/login    program to exec when name obtained
    mb      bool    false             do flow control based on carrier
    nc      bool    false             terminal does not supply carrier (set
    nl      bool    false             terminal has (or might have) a newline
    np      bool    false             terminal uses no parity (i.e. 8-bit
    nx      str     default           next table (for auto speed selection)
    o0      num     unused            tty output flags to write messages
    o1      num     unused            tty output flags to read login name
    o2      num     unused            tty output flags to leave terminal as
    op      bool    false             terminal uses odd parity
    os      num     unused            output speed
    pc      str     `\0'              pad character
    pe      bool    false             use printer (hard copy) erase algorithm
    pf      num     0                 delay between first prompt and follow-
                                      ing flush (seconds)
    pl      bool    false             start PPP login program unconditionally
                                      if pp is specified
    pp      str     unused            PPP login program
    ps      bool    false             line connected to a MICOM port selector
    qu      str     `^\'              quit character
    rp      str     `^R'              line retype character
    rt      num     unused            ring timeout when using ac
    rw      bool    false             do NOT use raw for input, use cbreak
    sp      num     unused            line speed (input and output)
    su      str     `^Z'              suspend character
    tc      str     none              table continuation
    to      num     0                 timeout (seconds)
    tt      str     NULL              terminal type (for environment)
    ub      bool    false             do unbuffered output (of prompts etc)
    we      str     `^W'              word erase character
    xc      bool    false             do NOT echo control chars as `^X'
    xf      str     `^S'              XOFF (stop output) character
    xn      str     `^Q'              XON (start output) character
    Lo      str     C                 the locale name used for %d in the
                                      banner message
    The following capabilities are no longer supported by getty(8):
    bd      num     0                 backspace delay
    cb      bool    false             use crt backspace mode
    cd      num     0                 carriage-return delay
    fd      num     0                 form-feed (vertical motion) delay
    lc      bool    false             terminal has lower case
    nd      num     0                 newline (line-feed) delay
    uc      bool    false             terminal is known upper case only
    If no line speed is specified, speed will not be altered from that which
    prevails when getty is entered.  Specifying an input or output speed will
    override line speed for stated direction only.
    Terminal modes to be used for the output of the message, for input of the
    login name, and to leave the terminal set as upon completion, are derived
    from the boolean flags specified.  If the derivation should prove inade-
    quate, any (or all) of these three may be overridden with one of the c0,
    c1, c2, i0, i1, i2, l0, l1, l2, o0, o1, or o2 numeric specifications,
    which can be used to specify (usually in octal, with a leading '0') the
    exact values of the flags.  These flags correspond to the termios
    c_cflag, c_iflag, c_lflag, and c_oflag fields, respectively.  Each these
    sets must be completely specified to be effective.  The f0, f1, and f2
    are excepted for backwards compatibility with a previous incarnation of
    the TTY sub-system.  In these flags the bottom 16 bits of the (32 bits)
    value contain the sgttyb sg_flags field, while the top 16 bits represent
    the local mode word.
    Should getty(8) receive a null character (presumed to indicate a line
    break) it will restart using the table indicated by the nx entry.  If
    there is none, it will re-use its original table.
    Delays are specified in milliseconds, the nearest possible delay avail-
    able in the tty driver will be used.  Should greater certainty be
    desired, delays with values 0, 1, 2, and 3 are interpreted as choosing
    that particular delay algorithm from the driver.
    The cl screen clear string may be preceded by a (decimal) number of mil-
    liseconds of delay required (a la termcap).  This delay is simulated by
    repeated use of the pad character pc.
    The initial message, login message, and initial file; im, lm and if may
    include any of the following character sequences, which expand to infor-
    mation about the environment in which getty(8) is running.
          %d               The current date and time formatted according to
                           the Lo and df strings.
          %h               The hostname of the machine, which is normally
                           obtained from the system using gethostname(3), but
                           may also be overridden by the hn table entry.  In
                           either case it may be edited with the he string.
                           A '@' in the he string causes one character from
                           the real hostname to be copied to the final host-
                           name.  A '#' in the he string causes the next
                           character of the real hostname to be skipped.
                           Each character that is neither '@' nor '#' is
                           copied into the final hostname.  Surplus '@' and
                           '#' characters are ignored.
          %t               The tty name.
          %m, %r, %s, %v   The type of machine, release of the operating sys-
                           tem, name of the operating system, and version of
                           the kernel, respectively, as returned by uname(3).
          %%               A ``% character.
    When getty execs the login process, given in the lo string (usually
    ``/usr/bin/login), it will have set the environment to include the ter-
    minal type, as indicated by the tt string (if it exists).  The ev string,
    can be used to enter additional data into the environment.  It is a list
    of comma separated strings, each of which will presumably be of the form
    If a non-zero timeout is specified, with to, then getty will exit within
    the indicated number of seconds, either having received a login name and
    passed control to login(1), or having received an alarm signal, and
    exited.  This may be useful to hangup dial in lines.
    Output from getty(8) is even parity unless op or np is specified.  The op
    string may be specified with ap to allow any parity on input, but gener-
    ate odd parity output.  Note: this only applies while getty is being run,
    terminal driver limitations prevent a more complete implementation.  The
    getty(8) utility does not check parity of input characters in RAW mode.
    If a pp string is specified and a PPP link bring-up sequence is recog-
    nized, getty will invoke the program referenced by the pp option.  This
    can be used to handle incoming PPP calls.  If the pl option is true as
    well, getty(8) will skip the user name prompt and the PPP detection
    phase, and will invoke the program specified by pp instantly.
    Getty provides some basic intelligent modem handling by providing a chat
    script feature available via two capabilities:
          ic        Chat script to initialize modem.
          ac        Chat script to answer a call.
    A chat script is a set of expect/send string pairs.  When a chat string
    starts, getty will wait for the first string, and if it finds it, will
    send the second, and so on.  Strings specified are separated by one or
    more tabs or spaces.  Strings may contain standard ASCII characters and
    special 'escapes', which consist of a backslash character followed by one
    or more characters which are interpreted as follows:
          \a        bell character.
          \b        backspace.
          \n        newline.
          \e        escape.
          \f        formfeed.
          \p        half-second pause.
          \r        carriage return.
          \S, \s    space character.
          \t        tab.
          \xNN      hexadecimal byte value.
          \0NNN     octal byte value.
    Note that the `\p' sequence is only valid for send strings and causes a
    half-second pause between sending the previous and next characters.
    Hexadecimal values are, at most, 2 hex digits long, and octal values are
    a maximum of 3 octal digits.
    The ic chat sequence is used to initialize a modem or similar device.  A
    typical example of an init chat script for a modem with a hayes compati-
    ble command set might look like this:
          :ic="" ATE0Q0V1\r OK\r ATS0=0\r OK\r:
    This script waits for nothing (which always succeeds), sends a sequence
    to ensure that the modem is in the correct mode (suppress command echo,
    send responses in verbose mode), and then disables auto-answer.  It waits
    for an "OK" response before it terminates.  The init sequence is used to
    check modem responses to ensure that the modem is functioning correctly.
    If the init script fails to complete, getty considers this to be fatal,
    and results in an error logged via syslogd(8), and exiting.
    Similarly, an answer chat script is used to manually answer the phone in
    response to (usually) a "RING".  When run with an answer script, getty
    opens the port in non-blocking mode, clears any extraneous input and
    waits for data on the port.  As soon as any data is available, the answer
    chat script is started and scanned for a string, and responds according
    to the answer chat script.  With a hayes compatible modem, this would
    normally look something like:
          :ac=RING\r ATA\r CONNECT:
    This causes the modem to answer the call via the "ATA" command, then
    scans input for a "CONNECT" string.  If this is received before a ct
    timeout, then a normal login sequence commences.
    The ct capability specifies a timeout for all send and expect strings.
    This timeout is set individually for each expect wait and send string and
    must be at least as long as the time it takes for a connection to be
    established between a remote and local modem (usually around 10 seconds).
    In most situations, you will want to flush any additional input after the
    connection has been detected, and the de capability may be used to do
    that, as well as delay for a short time after the connection has been
    established during which all of the connection data has been sent by the

[править] SEE ALSO

login(1) • gethostname(3) • uname(3) • termcap(5) • getty(8) • telnetd(8)

[править] HISTORY

The gettytab file format appeared in 4.2BSD.

[править] BUGS

    The special characters (erase, kill, etc.) are reset to system defaults
    by login(1).  In all cases, '#' or '^H' typed in a login name will be
    treated as an erase character, and '@' will be treated as a kill charac-
    The delay stuff is a real crock.  Apart form its general lack of flexi-
    bility, some of the delay algorithms are not implemented.  The terminal
    driver should support sane delay settings.
    The he capability is stupid.
    The termcap(5) format is horrid, something more rational should have been

FreeBSD 9.0 April 19, 1994 FreeBSD 9.0

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