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The following command line options are supported:
Select a new video mode.
The modes currently recognized are:
The raster text mode
can also be chosen.
Alternatively, a mode can be specified with its number by using a mode name of
A list of valid mode numbers can be obtained with the
|Change colors when displaying text. Specify the foreground color (e.g. "vidcontrol white"), or both a foreground and background colors (e.g. "vidcontrol yellow blue"). Use the show command below to see available colors.|
|show||See the supported colors on a given platform.|
|Set border color to color. This option may not be always supported by the video driver.|
|Clear the history buffer.|
Change the cursor appearance.
The change is specified by a non-empty comma-separated list of
overrides or modifies previous ones in left to right order.
The following override settings are available:
|Set to a block covering 1 character cell, with a configuration-dependent coloring that should be at worst inverse video.|
|Set to a blinking sub-block with height scanlines starting at base. The name "destructive" is bad for backwards compatibility. This setting should not force destructiveness, and it now only gives destructiveness in some configurations (typically for hardware cursors in text mode). Blinking limits destructiveness. This setting should now be spelled normal, blink, noblock. A non-blinking destructive cursor would be unusable, so old versions of vidcontrol didn't support it, and this version doesn't have an override for it.|
|Set the specified scanline parameters. These parameters are only active in noblock mode. value is an integer in any base supported by strtol(3). Setting height to 0 turns off the cursor in noblock mode. Negative values are silently ignored. Positive values are clamped to fit in the character cell when the cursor is drawn.|
The following modifier settings are available:
|Set or clear the blinking attribute. This is not quite backwards compatible. In old versions of vidcontrol, was an override to a blinking block.|
|Set or clear the block attribute. This attribute is the inverse of the flag CONS_CHAR_CURSOR in the implementation. It deactivates the scanline parameters, and expresses a preference for using a simpler method of implementation. Its inverse does the opposite. When the scanline parameters give a full block, this attribute reduces to a method selection bit. The block method tends to give better coloring.|
|Set or clear the hidden attribute.|
The following (non-sticky) flags control application of the settings:
|Apply base and height to the (character) cursor's list of preferred colors instead of its shape. Beware that the color numbers are raw VGA palette indexes, not ANSI color numbers. The indexes are reduced mod 8, 16 or 256, or ignored, depending on the video mode and renderer.|
|Colors for the mouse cursor in graphics mode. Like charcolors, except there is no preference or sequence; base gives the mouse border color and height gives the mouse interior color. Together with charcolors, this gives 2 selection bits which select between only 3 of 4 sub-destinations of the 4 destinations selected by default and local (by ignoring mousecolors if charcolors is also set).|
|Apply the changes to the default settings and then to the active settings, instead of only to the active settings. Together with local, this gives 2 selection bits which select between 4 destinations.|
|Ignore any changes to the block and hidden attributes.|
|local||Apply the changes to the current vty. The default is to apply them to a global place and copy from there to all vtys.|
|reset||Reset everything. The default is to not reset. When the local parameter is specified, the current local settings are reset to default local settings. Otherwise, the current global settings are reset to default global settings and then copied to the current and default settings for all vtys.|
|show||Show the current changes.|
|Print out current output screen map.|
Size may be omitted, in this case vidcontrol will try to guess it from the size of font file.
When using vt(4) both size and font can be omitted, and the default font will be loaded.
Note that older video cards, such as MDA and CGA, do not support software font. See also Video Mode Support and EXAMPLES below and the man page for either syscons(4) or vt(4) (depending on which driver you use).
|Set the geometry of the text mode for the modes with selectable geometry. Currently only raster modes, such as VESA_800x600, support this option. See also Video Mode Support and EXAMPLES below.|
|Set the size of the history (scrollback) buffer to size lines.|
|Shows the active vty number.|
|Shows info about the current video adapter.|
|Shows the possible video modes with the current video hardware.|
|Install screen output map file from screen_map. See also syscons(4) or vt(4) (depending on which driver you use).|
|Install default screen output map.|
|Sets the base character used to render the mouse pointer to char.|
|Switch the mouse pointer on or off. Used together with the moused(8) daemon for text mode cut & paste functionality.|
|Capture the current contents of the video buffer corresponding to the terminal device referred to by standard input. The vidcontrol utility writes contents of the video buffer to the standard output in a raw binary format. For details about that format see Format of Video Buffer Dump below.|
When used with
|Change reverse mode colors to foreground and background.|
|Turn vty switching on or off. When vty switching is off, attempts to switch to a different virtual terminal will fail. (The default is to permit vty switching.) This protection can be easily bypassed when the kernel is compiled with the DDB option. However, you probably should not compile the kernel debugger on a box which is supposed to be physically secure.|
|Set the active vty to number.|
|Switch between xterm and cons25 style terminal emulation.|
|Set the screensaver timeout to N seconds, or turns it off.|
|Use hexadecimal digits for output.|
The VESA BIOS support must be linked to the kernel or loaded as a KLD module if you wish to use VESA video modes or 132 column modes (see vga(4)).
You need to compile your kernel with the VGA_WIDTH90 option if you wish to use VGA 90 column modes (see vga(4)).
Video modes other than 25 and 30 line modes may require specific size of font.
|Font size 25 line modes||8x16 (VGA), 8x14 (EGA) 30 line modes||8x16 43 line modes||8x8 50 line modes||8x8 60 line modes||8x8|
It is better to always load all three sizes (8x8, 8x14 and 8x16) of the same font.
You may set variables in /etc/rc.conf or /etc/rc.conf.local so that desired font files will be automatically loaded when the system starts up. See below.
If you want to use any of the raster text modes you need to recompile your kernel with the SC_PIXEL_MODE option. See syscons(4) or vt(4) (depending on which driver you use) for more details on this kernel option.
VGA video memory is typically arranged in two byte tuples, one per character position. In each tuple, the first byte will be the character code, and the second byte is the character's color attribute.
The VGA color attribute byte looks like this:
|meaning 7 Ta <X0000000> Ta 1||character blinking 6:4 Ta <0XXX0000> Ta 3||background color 3 Ta <0000X000> Ta 1||bright foreground color 2:0 Ta <00000XXX> Ta 3||foreground color|
Here is a list of the three bit wide base colors:
Base colors with bit 3 (the bright foreground flag) set:
For example, the two bytes
specify an uppercase A (character code 65), blinking (bit 7 set) in yellow (bits 3:0) on a blue background (bits 6:4).
The vidcontrol output contains a small header which includes additional information which may be useful to utilities processing the output.
The first 10 bytes are always arranged as follows:
1 thru 8
|Literal text "SCRSHOT_"|
|File format version number|
|Remaining number of bytes in the header|
Subsequent bytes depend on the version number.
|Version Ta Byte||Meaning|
1 Ta 11
|Terminal width, in characters|
|Terminal depth, in characters|
Ta 13 and up
|The snapshot data|
So a dump of an 80x25 screen would start (in hex)
53 43 52 53 48 4f 54 5f 01 02 50 19 ----------------------- -- -- -- -- | | | | ` 25 decimal | | | `--- 80 decimal | | `------ 2 remaining bytes of header data | `--------- File format version 1 `------------------------ Literal "SCRSHOT_"
Sets the timeout value for the
|font8x16 , font8x14 , font8x8|
Specifies font files for the
Specifies a screen output map file for the
See rc.conf(5) for more details.
|/usr/share/syscons/scrnmaps/*||screen output map files (relevant for syscons(4) only).|
vidcontrol -f 8x16 /usr/share/syscons/fonts/iso-8x16.fnt
So long as the font file is in /usr/share/syscons/fonts (if using syscons) or /usr/share/vt/fonts (if using vt), you may abbreviate the file name as iso-8x16:
vidcontrol -f 8x16 iso-8x16
Furthermore, you can also omit font size "8x16":
vidcontrol -f iso-8x16
Moreover, the suffix specifying the font size can be also omitted; in this case, vidcontrol will use the size of the currently displayed font to construct the suffix:
vidcontrol -f iso
Likewise, you can also abbreviate the screen output map file name for
vidcontrol -l iso-8859-1_to_cp437
The above command will load /usr/share/syscons/scrnmaps/iso-8859-1_to_cp437.scm.
The following command will set-up a 100x37 raster text mode (useful for some LCD models):
vidcontrol -g 100x37 VESA_800x600
The following command will capture the contents of the first virtual terminal video buffer, and redirect the output to the shot.scr file:
vidcontrol -p < /dev/ttyv0 > shot.scr
The following command will dump contents of the fourth virtual terminal video buffer to the standard output in the human readable format:
vidcontrol -P < /dev/ttyv3
The various scr2* utilities in the graphics and textproc categories of the Ports Collection.
|VIDCONTROL (1)||January 19, 2016|
|Main index||Section 1||日本語||한국인||Options|
|“||I define UNIX as “30 definitions of regular expressions living under one roof.”||”|
|— Donald Knuth|