1.\"
| 1.\"
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2.\" $FreeBSD: head/share/man/man4/screen.4 53200 1999-11-15 23:14:32Z phantom $
| 2.\" $FreeBSD: head/share/man/man4/screen.4 57676 2000-03-01 14:50:24Z sheldonh $
|
3.\"
4.Dd January 8, 1995
5.Dt SCREEN 4
6.Os FreeBSD
7.Sh NAME
8.Nm screen
9.Nd pc display interface
10.Sh DESCRIPTION
11
12Access to the
13.Ar virtual consoles
14are obtained through the device files
15ttyv0 - ttyvb in
16.Pa /dev .
17Each of these files correspond to a separate
18virtual console.
19All virtual console devices can be open at once, but only one is
| 3.\"
4.Dd January 8, 1995
5.Dt SCREEN 4
6.Os FreeBSD
7.Sh NAME
8.Nm screen
9.Nd pc display interface
10.Sh DESCRIPTION
11
12Access to the
13.Ar virtual consoles
14are obtained through the device files
15ttyv0 - ttyvb in
16.Pa /dev .
17Each of these files correspond to a separate
18virtual console.
19All virtual console devices can be open at once, but only one is
|
20active at a time. The active virtual console "owns" the keyboard and
| 20active at a time.
21The active virtual console "owns" the keyboard and
|
21display screen.
22.Pp
23Output to a virtual console that not currently is on the display is
24saved in a buffer that holds a "screenfull" (normally 25) lines.
25Any output written to
26.Pa /dev/console
27(the original console device) is echoed to
28.Pa /dev/ttyv0.
29.Pp
30To switch between the virtual consoles one uses the sequence
31.Ar ALT+Fn
| 22display screen.
23.Pp
24Output to a virtual console that not currently is on the display is
25saved in a buffer that holds a "screenfull" (normally 25) lines.
26Any output written to
27.Pa /dev/console
28(the original console device) is echoed to
29.Pa /dev/ttyv0.
30.Pp
31To switch between the virtual consoles one uses the sequence
32.Ar ALT+Fn
|
32, which means hold down ALT and press one of the function keys. The
| 33, which means hold down ALT and press one of the function keys.
34The
|
33virtual console with the same number as the function key is then
34selected as the current virtual console, and given exclusive use of
| 35virtual console with the same number as the function key is then
36selected as the current virtual console, and given exclusive use of
|
35the keyboard and display. This switch sequence can be changed via
| 37the keyboard and display.
38This switch sequence can be changed via
|
36the keyboard mapping ioctl call (see keyboard.4)
37.Pp
38
39The console allows entering values that are not physically
40present on the keyboard via a special keysequence.
41To use this facility press and hold down ALT,
42then enter a decimal number from 0-255 via the numerical keypad, then
| 39the keyboard mapping ioctl call (see keyboard.4)
40.Pp
41
42The console allows entering values that are not physically
43present on the keyboard via a special keysequence.
44To use this facility press and hold down ALT,
45then enter a decimal number from 0-255 via the numerical keypad, then
|
43release ALT. The entered value is then used as the ASCII value for one
44character. This way it is possible to enter any ASCII value.
45The console driver also includes a history function. It is activated by
46pressing the scroll-lock key. This holds the display, and enables the cursor
| 46release ALT.
47The entered value is then used as the ASCII value for one
48character.
49This way it is possible to enter any ASCII value.
50The console driver also includes a history function.
51It is activated by
52pressing the scroll-lock key.
53This holds the display, and enables the cursor
|
47arrows for scrolling up and down through the last scrolled out lines.
48
49The console understands a subset of the ANSI x3.64 character
| 54arrows for scrolling up and down through the last scrolled out lines.
55
56The console understands a subset of the ANSI x3.64 character
|
50sequences. For compatibility with the old pccons, the PC3 character
| 57sequences.
58For compatibility with the old pccons, the PC3 character
|
51sequences is also supported.
52.Pp
53.Bd -literal
54ANSI Seq Function Termcap entry
55======= ======= ===================================== ==============
56
57-- E7 Save cursor position sc
58
--- 110 unchanged lines hidden --- | 59sequences is also supported.
60.Pp
61.Bd -literal
62ANSI Seq Function Termcap entry
63======= ======= ===================================== ==============
64
65-- E7 Save cursor position sc
66
--- 110 unchanged lines hidden --- |