From Linux Man Pages
setfont - load EGA/VGA console screen font
SYNOPSIS
setfont [-O font+umap.orig] [-o font.orig] [-om cmap.orig] [-ou umap.orig] [-N] [font.new ...] [-m cmap] [-u
umap] [-C console] [-hH] [-v] [-V]
DESCRIPTION
The setfont command reads a font from the file font.new and loads it into the EGA/VGA character generator, and
optionally outputs the previous font. It can also load various mapping tables and output the previous versions.
If no args are given (or only the option -N for some number N), then a default (8xN) font is loaded (see below).
One may give several small fonts, all containing a Unicode table, and setfont will combine them and load the
union. Typical use:
setfont
Load a default font.
setfont drdos8x16
Load a given font (here the 448-glyph drdos font).
setfont cybercafe -u cybercafe
Load a given font that does not have a Unicode map and provide one explicitly.
setfont LatArCyrHeb-19 -m 8859-2
Load a given font (here a 512-glyph font combining several character sets) and indicate that one's local
character set is ISO 8859-2.
FONT FORMATS
The standard Linux font format is the PSF font. It has a header describing font properties like character size,
followed by the glyph bitmaps, optionally followed by a Unicode mapping table giving the Unicode value for each
glyph. Several other (obsolete) font formats are recognized. If the input file has code page format (probably
with suffix .cp), containing three fonts with sizes e.g. 8x8, 8x14 and 8x16, then one of the options -8 or -14 or
-16 must be used to select one. Raw font files are binary files of size 256*N bytes, containing bit images for
each of 256 characters, one byte per scan line, and N bytes per character (0 < N <= 32). Most fonts have a width
of 8 bits, but with the framebuffer device (fb) other widths can be used.
FONT HEIGHT
The program setfont has no built-in knowledge of VGA video modes, but just asks the kernel to load the character
ROM of the video card with certain bitmaps. However, since Linux 1.3.1 the kernel knows enough about EGA/VGA
video modes to select a different line distance. The default character height will be the number N inferred from
the font or specified by option. However, the user can specify a different character height H using the -h
option.
CONSOLE MAPS
Several mappings are involved in the path from user program output to console display. If the console is in utf8
mode (see unicode_start(1)) then the kernel expects that user program output is coded as UTF-8 (see utf-8(7)),
and converts that to Unicode (ucs2). Otherwise, a translation table is used from the 8-bit program output to
16-bit Unicode values. Such a translation table is called a Unicode console map. There are four of them: three
built into the kernel, the fourth settable using the -m option of setfont. An escape sequence chooses between
these four tables; after loading a cmap, setfont will output the escape sequence Esc ( K that makes it the active
translation.
Suitable arguments for the -m option are for example 8859-1, 8859-2, ..., 8859-15, cp437, ..., cp1250.
Given the Unicode value of the symbol to be displayed, the kernel finds the right glyph in the font using the
Unicode mapping info of the font and displays it.
Old fonts do not have Unicode mapping info, and in order to handle them there are direct-to-font maps (also
loaded using -m) that give a correspondence between user bytes and font positions. The most common correspon-
dence is the one given in the file trivial (where user byte values are used directly as font positions). Other
correspondences are sometimes preferable since the PC video hardware expects line drawing characters in certain
font positions.
Giving a -m none argument inhibits the loading and activation of a mapping table. The previous console map can
be saved to a file using the -om file option. These options of setfont render mapscrn(8) obsolete. (However, it
may be useful to read that man page.)
UNICODE FONT MAPS
The correspondence between the glyphs in the font and Unicode values is described by a Unicode mapping table.
Many fonts have a Unicode mapping table included in the font file, and an explicit table can be indicated using
the -u option. The program setfont will load such a Unicode mapping table, unless a -u none argument is given.
The previous Unicode mapping table will be saved as part of the saved font file when the -O option is used. It
can be saved to a separate file using the -ou file option. These options of setfont render loadunimap(8) obso-
lete.
The Unicode mapping table should assign some glyph to the `missing character' value U+fffd, otherwise missing
characters are not translated, giving a usually very confusing result.
Usually no mapping table is needed, and a Unicode mapping table is already contained in the font (sometimes this
is indicated by the .psfu extension), so that most users need not worry about the precise meaning and functioning
of these mapping tables.
One may add a Unicode mapping table to a psf font using psfaddtable(1).
OPTIONS
-h H Override font height.
-m file
Load console map or Unicode console map from file.
-o file
Save previous font in file.
-O file
Save previous font and Unicode map in file.
-om file
Store console map in file.
-ou file
Save previous Unicode map in file.
-u file
Load Unicode table describing the font from file.
-C console
Set the font for the indicated console. (May require root permissions.)
-v Be verbose.
-V Print version and exit.
FILES
/usr/share/kbd/consolefonts is the default font directory. /usr/share/kbd/unimaps is the default directory for
Unicode maps. /usr/share/kbd/consoletrans is the default directory for screen mappings. The default font is a
file default (or default8xN if the -N option was given for some number N) perhaps with suitable extension (like
.psf).
RELATED
psfaddtable(1), unicode_start(1), loadunimap(8), utf-8(7), mapscrn(8)
CATEGORY