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158 lines
4.2 KiB
Groff
158 lines
4.2 KiB
Groff
.Dd April 7, 1993
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.Dt SCREEN 4
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.Os FreeBSD
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.Sh NAME
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.Nm screen
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.Nd pc display interface
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.Sh DESCRIPTION
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Access to the
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.Ar virtual consoles
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are obtained through the device files
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tty01 - ttynn in /dev.
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Each of these files correspond to a seperate
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virtual console.
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All virtual console devices can be open at once, but only one is
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active at a time. The active virtual console "owns" the keyboard and
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display screen.
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.Pp
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Output to a virtual console that not currently is on the display is
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saved in a buffer that holds a "screenfull" (normally 25) lines.
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Any output written to
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.Ar /dev/console
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(the original console device) is echoed to /dev/tty01.
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.Pp
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To switch between the virtual consoles one uses the sequence
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.Ar ALT+Fn
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, which means hold down ALT and press one of the function keys. The
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virtual console with the same number as the function key is then
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selected as the current virtual console, and given exclusive use of
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the keyboard and display. This switch sequence can be changed via
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the keyboard mapping ioctl call (see keyboard.man)
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.Pp
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The number of virtual consoles is changeable in the system config
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file, and need recompilation of the kernel to take any effect. The
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default is 12.
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The console allows entering values that are not physically
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present on the keyboard via a special keysequence.
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To use this facility press and hold down ALT,
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then enter a decimal number from 0-255 via the numerical keypad, then
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release ALT. The entered value is then used as the ASCII value for one
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character. This way it is possible to enter any ASCII value.
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The console understands a subset of the ANSI x3.64 character
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sequences. For compatibility with the old pccons, the PC3 character
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sequences is also supported.
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.Pp
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.Bd -literal
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ANSI Seq Function Termcap entry
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======= ======= ===================================== ==============
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CUU E[nA move cursor up n lines up (ku)
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CUD E[nB move cursor down n lines do (kd)
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CUF E[nC move cursor right n characters nd (kr)
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CUB E[nD move cursor left n characters bs (kl)
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HPA E[n` move cursor character position n --
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HPR E[na move cursor right n characters --
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VPA E[nd move cursor to line n --
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VPR E[ne move cursor down n lines --
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CPL E[nF move cursor to start of line, --
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n lines up
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CNL E[nF move cursor to start of line, --
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n lines down
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CUP E[y;xH Move cursor to x, y cm
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HVP E[y;xf Move cursor to x, y --
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CBT E[nZ Move cursor back n tab stops bt
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IL E[nL Insert n blank lines al
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ICH E[n@ Insert n blank characters ic
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DL E[nM Delete n lines dl
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DCH E[nP Delete n characters dc
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ED E[nJ Erase part or all of display: cd
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n=0 from cursor to end of display,
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n=1 from begin of display to cursor,
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n=2 entire display.
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EL E[nK Erase part or all of line: ce
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n=0 from cursor to end of line,
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n=1 from begin of line to cursor,
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n=2 entire line.
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ECH E[nX Erase n characters --
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SU E[nS Scroll display n lines up (forward) sf
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SD E[nT Scroll display n lines down (reverse) sr
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SGR E[nm Set character attributes: --
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n= 0 normal attribute (all off)
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n= 1 bold (highlight)
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n= 4 underscore (if supported by HW)
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n= 5 blink (if supported by HW)
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n= 7 reverse
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n=3X set foreground color (see table)
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n=4X set background color (see table)
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X=0 black X=1 red
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X=2 green X=3 brown
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X=4 blue X=5 magenta
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X=6 cyan X=7 white
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-- E[=p;dB Set bell pitch (p) and duration (d), --
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picth is in units of 840 nS,
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duration is units of 0,1 S.
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-- E[=s:eC Set cursor start and end scanline, --
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start on line s, end on line e.
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-- E[=nA Set the border color to color n
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(see table) (if supported by HW)
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-- E[=cF set normal foreground color to n --
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(see table)
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-- E[=cG set normal background color to n --
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(see table)
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-- E[=cH set reverse foreground color to n --
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(see table)
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-- E[=cI set reverse background color to n --
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(see table)
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n= 0 black n= 8 grey
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n= 1 blue n= 9 light blue
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n= 2 green n=10 light green
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n= 3 cyan n=11 light cyan
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n= 4 red n=12 light red
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n= 5 magenta n=13 light magenta
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n= 6 brown n=14 yellow
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n= 7 white n=15 light white
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note: the first E in the sequences stands for ESC (0x1b)
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.Ed
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.Pp
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.Sh AUTHOR
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S_ren Schmidt
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Email: (baukno@login.dkuug.dk -or- sos@kmd-ac.dk)
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