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SCREEN(4)	       FreeBSD Kernel Interfaces Manual		     SCREEN(4)

NAME
     screen -- pc display interface

DESCRIPTION
     Access to the virtual consoles are	obtained through the device files
     /dev/ttyv0	- /dev/ttyvb.  Each of these files correspond to a separate
     virtual console.  All virtual console devices can be open at once,	but
     only one is active	at a time.  The	active virtual console "owns" the key-
     board and display screen.

     Output to a virtual console that not currently is on the display is saved
     in	a buffer that holds a "screenfull" (normally 25) lines.	 Any output
     written to	/dev/console (the original console device) is echoed to
     /dev/ttyv0.

     To	switch between the virtual consoles one	uses the sequence ALT+Fn,
     which means hold down ALT and press one of	the function keys.  The	vir-
     tual console with the same	number as the function key is then selected as
     the current virtual console, and given exclusive use of the keyboard and
     display.  This switch sequence can	be changed via the keyboard mapping
     ioctl call	(see keyboard(4)).

     The console allows	entering values	that are not physically	present	on the
     keyboard via a special keysequence.  To use this facility press and hold
     down ALT, then enter a decimal number from	0-255 via the numerical	key-
     pad, then release ALT.  The entered value is then used as the ASCII value
     for one character.	 This way it is	possible to enter any ASCII value.
     The console driver	also includes a	history	function.  It is activated by
     pressing the scroll-lock key.  This holds the display, and	enables	the
     cursor arrows for scrolling up and	down through the last scrolled out
     lines.

     The console understands a subset of the ANSI x3.64	character sequences.
     For compatibility with the	old pccons, the	PC3 character sequences	are
     also supported.

     ANSI    Seq     Function				     Termcap entry
     ======= ======= =====================================   ==============

     --	     E7	     Save cursor position		     sc

     --	     E8	     Restore saved cursor position	     rc

     --	     Ec	     Reset				     rs

     --	     EM	     move cursor up 1 line,		     --
		     scroll if at top

     CUU     E[nA    move cursor up n lines		     up/UP (ku)

     CUD     E[nB    move cursor down n	lines		     do/DO (kd)

     CUF     E[nC    move cursor right n characters	     nd/RI (kr)

     CUB     E[nD    move cursor left n	characters	     --/LE (kl)

     HPA     E[n`    move cursor to character position n     ch

     HPR     E[na    move cursor right n characters	     --

     VPA     E[nd    move cursor to line n		     cv

     VPR     E[ne    move cursor down n	lines		     --

     CPL     E[nF    move cursor to start of line,	     --	(@7)
		     n lines up

     CNL     E[nE    move cursor to start of line,	     nw
		     n lines down

     CUP     E[y;xH  Move cursor to x, y		     cm

     HVP     E[y;xf  Move cursor to x, y		     --

     CBT     E[nZ    Move cursor back n	tab stops	     bt	(kB)

     IL	     E[nL    Insert n blank lines		     al/AL

     ICH     E[n@    Insert n blank characters		     ic/IC

     DL	     E[nM    Delete n lines			     dl/DL

     DCH     E[nP    Delete n characters		     dc/DC

     ED	     E[nJ    Erase part	or all of display:	     cd
		     n=0 from cursor to	end of display,
		     n=1 from begin of display to cursor,
		     n=2 entire	display.

     EL	     E[nK    Erase part	or all of line:		     ce
		     n=0 from cursor to	end of line,
		     n=1 from begin of line to cursor,
		     n=2 entire	line.

     ECH     E[nX    Erase n characters			     ec

     SU	     E[nS    Scroll display n lines up (forward)     sf/SF

     SD	     E[nT    Scroll display n lines down (reverse)   sr/SR

     SGR     E[nm    Set character attributes:		     --
		     n=	0  normal attribute (all off)
		     n=	1  bold	(highlight)
		     n=	4  underscore (if supported by HW)
		     n=	5  blink (if supported by HW)
		     n=	7  reverse
		     n=	22 remove bold
		     n=	24 remove underscore
		     n=	25 remove blink
		     n=	27 remove reverse
		     n=	3X set ANSI foreground color
			   (see	table)
		     n=	4X set ANSI background color
			   (see	table)

			X=0 black    X=1 red
			X=2 green    X=3 brown
			X=4 blue     X=5 magenta
			X=6 cyan     X=7 light grey
			X=9 reset to the normal	color

     --	     E[s     Save cursor position		     sc

     --	     E[u     Restore saved cursor position	     rc

     --	     E[x     Reset normal colors and attributes	     --
		     to	their default values

     --	     E[nz    Switch to virtual console n	     --

     --	     E[1;nx  Set normal	ANSI background	color	     --
		     to	n (see table)

     --	     E[2;nx  Set normal	ANSI foreground	color	     --
		     to	n (see table)

     --	     E[3;nx  Set normal	video attribute	directly     --
		     to	n (n from 0 to 255)

     --	     E[5;nx  Set normal	ANSI reverse background	     --
		     color to n	(see table)

     --	     E[6;nx  Set normal	ANSI reverse foreground	     --
		     color to n	(see table)

			n= 0 black	n= 8 dark grey
			n= 1 red	n= 9 light red
			n= 2 green	n=10 light green
			n= 3 brown	n=11 yellow
			n= 4 blue	n=12 light blue
			n= 5 magenta	n=13 light magenta
			n= 6 cyan	n=14 light cyan
			n= 7 light grey	n=15 white

     --	     E[7;nx  Set normal	reverse	video attribute	     --
		     directly to n (n from 0 to	255)

     --	     E[=p;dB Set bell pitch (p)	and duration (d),    --
			     pitch is in units of 840 nS,
			     duration is units of 0,1 S.

     --	     E[=tC   Set global	cursor type (see table)	     --

			t=0 normal non-blinking
			t=1 normal blinking
			t=2 custom non-blinking
			t=3 custom blinking
			t=4 reset cursor (resets custom
			    cursor shape and sets current
			    cursor type	to 0)
			t=5 hide cursor

     --	     E[=s;eC Set custom	cursor shape, where	     --
		     s is the starting and e is	the ending
		     scanlines of the cursor.

     --	     E[=s;e;dC					     --
		     Same as above, except d specifies the
		     direction.	 If 0, scanlines are counted
		     from the top to the bottom.  If 1,	from
		     the bottom	to the top.

     --	     E[=tS   Set local cursor type (see	table)	     --

			t=0 normal (global)		     ve
			t=1 invisible			     vi
			t=2 very visible		     vs

     --	     E[=nA   Set the border color to n		     --
		     (see table) (if supported by HW)

     --	     E[=nF   Set normal	foreground color to n	     --
		     (see table)

     --	     E[=nG   Set normal	background color to n	     --
		     (see table)

     --	     E[=nH   Set normal	reverse	foreground color     --
		     to	n (see table)

     --	     E[=nI   Set normal	reverse	background color     --
		     to	n (see table)

			n= 0 black	n= 8 dark grey
			n= 1 blue	n= 9 light blue
			n= 2 green	n=10 light green
			n= 3 cyan	n=11 light cyan
			n= 4 red	n=12 light red
			n= 5 magenta	n=13 light magenta
			n= 6 brown	n=14 yellow
			n= 7 light grey	n=15 white

     note: the first E in the sequences	stands for ESC (0x1b)

AUTHORS
     Soren Schmidt <sos@FreeBSD.org>

FreeBSD	9.2			October	6, 2000			   FreeBSD 9.2

NAME | DESCRIPTION | AUTHORS

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