157 lines
4.5 KiB
Groff
157 lines
4.5 KiB
Groff
.Dd January 8, 1995
|
||
.Dt SCREEN 4
|
||
.Os FreeBSD
|
||
.Sh NAME
|
||
.Nm screen
|
||
.Nd pc display interface
|
||
.Sh DESCRIPTION
|
||
|
||
Access to the
|
||
.Ar virtual consoles
|
||
are obtained through the device files
|
||
ttyv0 - ttyvb in /dev.
|
||
Each of these files correspond to a seperate
|
||
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 keyboard and
|
||
display screen.
|
||
.Pp
|
||
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
|
||
.Ar /dev/console
|
||
(the original console device) is echoed to /dev/ttyv0.
|
||
.Pp
|
||
To switch between the virtual consoles one uses the sequence
|
||
.Ar ALT+Fn
|
||
, which means hold down ALT and press one of the function keys. The
|
||
virtual 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)
|
||
.Pp
|
||
|
||
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 keypad, 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 activatet 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 is also supported.
|
||
.Pp
|
||
.Bd -literal
|
||
ANSI Seq Function Termcap entry
|
||
======= ======= ===================================== ==============
|
||
|
||
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=3X set foreground color (see table)
|
||
n=4X set 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 white
|
||
|
||
|
||
-- E[=p;dB Set bell pitch (p) and duration (d), --
|
||
picth is in units of 840 nS,
|
||
duration is units of 0,1 S.
|
||
|
||
-- E[=tC Set cursor type, 1 selects a blinking --
|
||
cursor, 0 a steady cursor.
|
||
|
||
-- E[=nA Set the border color to color n
|
||
(see table) (if supported by HW)
|
||
|
||
-- E[=cF set normal foreground color to n --
|
||
(see table)
|
||
|
||
-- E[=cG set normal background color to n --
|
||
(see table)
|
||
|
||
-- E[=cH set reverse foreground color to n --
|
||
(see table)
|
||
|
||
-- E[=cI set reverse background color to n --
|
||
(see table)
|
||
|
||
n= 0 black n= 8 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 white n=15 light white
|
||
|
||
note: the first E in the sequences stands for ESC (0x1b)
|
||
|
||
.Ed
|
||
.Pp
|
||
.Sh AUTHOR
|
||
S<>ren Schmidt (sos@FreeBSD.org)
|