Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

ttys(5) [bsd man page]

TTYS(5) 							File Formats Manual							   TTYS(5)

NAME
ttys - terminal initialization data DESCRIPTION
The ttys file contains information that is used by various routines to initialize and control the use of terminal special files. This information is read with the getttyent(3) library routines. There is one line in the ttys file per special file. Fields are separated by tabs and/or spaces. Some fields may contain more than one word and should be enclosed in double quotes. Blank lines and comments can appear anywhere in the file; comments are delimited by `#' and new line. Unspecified fields default to null. The first field is the termi- nal's entry in the device directory, /dev. The second field of the file is the command to execute for the line, typically getty(8), which performs such tasks as baud-rate recognition, reading the login name, and calling login(1). It can be, however, any desired command, for example the start up for a window system terminal emulator or some other daemon process, and can contain multiple words if quoted. The third field is the type of terminal normally connected to that tty line, as found in the termcap(5) data base file. The remaining fields set flags in the ty_status entry (see getttyent(3)) or specify a window system process that init(8) will maintain for the terminal line. As flag values, the strings `on' and `off' specify whether init should execute the command given in the second field, while `secure' in addition to `on' allows root to login on this line. These flag fields should not be quoted. The string `window=' is followed by a quoted command string which init will execute before starting getty. If the line ends in a comment, the comment is included in the ty_comment field of the ttyent structure. Some examples: console "/usr/libexec/getty std.1200" vt100 on secure ttyd0 "/usr/libexec/getty d1200" dialup on # 555-1234 ttyh0 "/usr/libexec/getty std.9600" hp2621-nl on # 254MC ttyh1 "/usr/libexec/getty std.9600" plugboard on # John's office ttyp0 none network ttyp1 none network off ttyv0 "/usr/new/xterm -L :0" vs100 on window="/usr/new/Xvs100 0" The first example permits root login on the console at 1200 baud, the second allows dialup at 1200 baud without root login, the third and fourth allow login at 9600 baud with terminal types of "hp2621-nl" and "plugboard" respectively, the fifth and sixth line are examples of network pseudo ttys, which should not have getty enabled on them, and the last example shows a terminal emulator and window system startup entry. FILES
/etc/ttys SEE ALSO
login(1), getttyent(3), gettytab(5), init(8), getty(8) 7th Edition November 16, 1996 TTYS(5)

Check Out this Related Man Page

ttys(5) 							File Formats Manual							   ttys(5)

Name
       ttys - terminal initialization data

Description
       The  file  contains information used by various routines to initialize and control the use of terminal special files.  This file is created
       when the system is installed and can be updated at any time.

       Each terminal special file ( ) has a line in the file.  Each line contains several fields.  Fields are separated  by  tabs  or  spaces.	 A
       field with more than one word should be enclosed in quotes.  Blank lines and comments can appear anywhere in the file.  Comments begin with
       a number sign (#) and are terminated by a newline character.  Unspecified fields default to the empty string or zero, as appropriate.

       The format of each line is as follows:
       name command type flag1 flag2 ...

       name	 Is the name of the special file for the terminal in the directory. Some examples are:
		 console
		 ttyd0
		 ttyd1

       command	 Is the command to be executed each time the terminal is initialized.  This can happen when the system	is  booted,  or  when  the
		 superuser  adds new terminals to the file and initializes the new terminals.  The command is usually which performs such tasks as
		 baud-rate recognition, reading the login name, and calling It can be any command you wish, such as the startup command for a win-
		 dow system terminal emulator or a command to maintain other daemon processes.

       type	 Is  the  type of terminal normally connected to the terminal special file.  You can find the possible types by examining the file
		 on your system.  The types available are given as the third field in entries in that file.  Some examples are:
		 vt100
		 vt200
		 dialup

       flags	 Are the flags to be set in the or fields of the structure returned by the routine.  If the line ends in a comment, the comment is
		 included in the field of this structure.

		 These fields are used by the command that is executed when terminals are initialized.

		 The flags are:

		 on	   Sets the TTY_ON bit in the field.  This enables logins for this terminal.

			   The default if this flag is not set is that logins are disabled for the terminal.

		 off	   Clears the TTY_ON bit in the field.	This disables logins for this terminal.

		 secure    Sets  the TTY_SECURE bit in the field.  This allows the root user to log in on this terminal.  (The on flag should also
			   be set.)

			   The default if this flag is not set is that the root user cannot log in on this terminal.

		 su	   Sets the TTY_SU bit in the field, to allow a user to su to root.

			   The default if this flag is not set is that users cannot su to root on this terminal.

		 nomodem   Sets the TTY_LOCAL bit in the field.  The line ignores modem signals.  This is the default if  neither  the	modem  nor
			   nomodem flag is set.

		 modem	   Clears the TTY_LOCAL bit in the field.  The line recognizes modem signals.

			   The default if this flag is not set is nomodem.  That is, the line does not recognize modem signals.

		 shared    Sets the TTY_SHARED bit in the field.  The line can be used for both incoming and outgoing connections.

			   The default if this flag is not set is that the line cannot be used for incoming and outgoing connections.

		 termio    Sets  the  TTY_TERMIO  bit  in  the	field.	This flag causes the terminal line to open with System Five default termio
			   attributes. If the termio flag is not set, Berkeley compliant default terminal attributes are used.

		 The flag is:

		 window="string"
			   The quoted string is a window system process that maintains for the terminal line.

Examples
       The following example permits the root user to log in on the console at 1200 baud:
       console "/etc/getty std.1200" vt100 on secure
       This example allows dialup at 1200 baud without root login:
       ttyd0 "/etc/getty d1200" dialup on
       These two examples allow login at 9600 baud with two different terminal types:  hp2621-nl and vt100.  In this example, the terminals should
       be set up to operate in 7-bit mode, because the std.9600 entry is specified:
       tty00 "/etc/getty std.9600" hp2621-nl on
       tty01 "/etc/getty std.9600" vt100 on
       This example shows the same two terminals as the previous example operating in full 8-bit mode.	Note the use of a different entry:
       tty00 "/etc/getty 8bit.9600" hp2621-nl on
       tty01 "/etc/getty 8bit.9600" vt100 on
       These two examples show network pseudoterminals, which should not have enabled:
       ttyp0 none network
       ttyp1 none network off
       This example shows a terminal emulator and window-system startup entry and should be typed all on one line:
       :0 "/usr/bin/login -P /usr/bin/Xprompter -C  /usr/bin/dxsession -e" none
       on secure  window="/usr/bin/Xcfb"
       This example shows an example of an entry for an lta device:
       tty01 "/etc/getty 8bit.9600" vt100 on modem secure # LAT
       Any  terminal configured to run in 8-bit mode should specify a entry that declares 8-bit operation.  The command field of the entry is used
       to specify the entry.  If the terminal device is set up to operate in 8-bit mode and the command field does not	specify  an  8-bit  entry,
       output  to  the	terminal appears as multinational characters.  These characters are the result of the program using the eighth bit of each
       character to represent parity attributes.  By using an 8-bit entry, the high order bit of each character is unaffected by the program.  The
       examples presented demonstrate the use of both 7- and 8-bit terminals.

Files
       The full pathname for the file

See Also
       login(1), getttyent(3), gettytab(5), getty(8), init(8)
       Guide to System Environment Setup

																	   ttys(5)
Man Page