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NetBSD 6.1.5 - man page for gettytab (netbsd section 5)

GETTYTAB(5)			     BSD File Formats Manual			      GETTYTAB(5)

     gettytab -- terminal configuration data base


     The gettytab file is a simplified version of the termcap(5) data base used to describe ter-
     minal 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.

     Where to run getty(8) processes is normally defined by ttys(5).

     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 settings.)	The default entry is also normally read by other
     programs that present login prompts to the user, such as telnetd(8), in order to retrieve
     the values of the he, hn, im, and if capabilities.

     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

     Name      Type		 Default    Description
     ab        bool		 false	    Auto-baud speed select mechanism for the Micom 600
					    portselector. Selection is done by looking at how the
					    character `\r' is garbled at 300, 1200, 4800, and
					    9600 baud.
     al        str		 NULL	    user to auto-login instead of prompting
     ap        bool		 false	    terminal uses any parity
     bk        str		 0377	    alternative end of line character (input break)
     b2        str		 0377	    alternative end of line character (input break)
     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 '\r\n' after login prompt
     cs        bool		 false	    clear screen based on terminal type in /etc/ttys
     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
     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
     if        str		 NULL	    display named file before prompt, like /etc/issue
     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
     lc        bool		 false	    terminal has lower case
     lm        str		 login:     login prompt
     ln        str		 '^V'	    ``literal next'' character
     lo        str		 /usr/bin/loginprogram to exec when name obtained
     mb        bool		 false	    do flow control based on carrier
     nl        bool		 false	    terminal has (or might have) a newline character
     nn        bool		 false	    do not prompt for a login name
     np        bool		 false	    terminal uses no parity (i.e. 8-bit characters)
     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 following flush (sec-
     pp        str		 unused     PPP authentication program
     ps        bool		 false	    line connected to a MICOM port selector
     qu        str		 '^\'	    quit character
     rp        str		 '^R'	    line retype character
     rw        bool		 false	    do NOT use raw for input, use cbreak
     sp        num		 unused     line speed (input and output)
     st        str		 '^T'	    status character
     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

     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
     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 direc-
     tion 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 inadequate, 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, respec-
     tively.  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

     Delays are specified in milliseconds, the nearest possible delay available 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 milliseconds of delay
     required (a la termcap).  This delay is simulated by repeated use of the pad character pc.

     The initial message, and login message, im and lm may include any of the following character
     sequences, which expand to information about the environment in which getty(8) is running.

     %d    The current date.
     %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 hostname.  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
     %t    The tty name.
     %m, %r, %s, %v
	   The type of machine, release of the operating system, 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 terminal 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 num-
     ber of seconds, either having received a login name and passed control to login(1), or hav-
     ing 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 generate odd parity output.  Note: this
     only applies while getty is being run, terminal driver limitations prevent a more complete
     implementation.  getty(8) does not check parity of input characters in RAW mode.

     If pp string is specified and a Point to Point Protocol (PPP) link bringup sequence is rec-
     ognized, getty(8) will invoke the program referenced by the pp string, e.g.  pppd(8).  This
     can be used to handle incoming PPP calls.

     login(1), gethostname(3), uname(3), termcap(5), ttys(5), getty(8), pppd(8), telnetd(8)

     The gettytab file format appeared in 4.2BSD.

     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 character.

     The delay stuff is a real crock.  Apart from its general lack of flexibility, some of the
     delay algorithms are not implemented.  The terminal driver should support sane delay set-

     The he capability is stupid.

     The termcap(5) format is horrid, something more rational should have been chosen.

BSD					 October 7, 2006				      BSD

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