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    The following form allows you to view linux man pages.

    Command:

    groff_font

    
    
    

    DESCRIPTION

           The groff font format is roughly a superset of the ditroff font format.
           The font files for device name  are  stored  in  a  directory  devname.
           There  are two types of file: a device description file called DESC and
           for each font F a font file called F.  These are text files; unlike the
           ditroff font format, there is no associated binary format.
    
       DESC file format
           The  DESC  file can contain the following types of line as shown below.
           Later entries in the file override previous values.
    
           charset
                  This line and everything following in the file are ignored.   It
                  is allowed for the sake of backwards compatibility.
    
           family fam
                  The default font family is fam.
    
           fonts n F1 F2 F3...Fn
                  Fonts  F1...Fn will be mounted in the font positions m+1,...,m+n
                  where m is the number of styles.  This command may  extend  over
                  more  than  one line.  A font name of 0 will cause no font to be
                  mounted on the corresponding font position.
    
           hor n  The horizontal resolution is n machine units.
    
           paperheight n
                  The physical vertical dimension of the output medium in  machine
                  units.   This  isn't used by troff itself; currently, only grops
                  uses it.
    
           paperwidth n
                  The physical  horizontal  dimension  of  the  output  medium  in
                  machine  units.   This isn't used by troff.  Currently, only the
                  grolbp output device uses it.
    
           papersize string
                  Select a paper size.  Valid values for string are the ISO  paper
                  types  A0-A7,  B0-B7,  C0-C7,  D0-D7, DL, and the US paper types
                  letter, legal, tabloid, ledger, statement, executive, com10, and
                  monarch.   Case is not significant for string if it holds prede-
                  fined paper types.  Alternatively, string can  be  a  file  name
                  (e.g.  '/etc/papersize'); if the file can be opened, groff reads
                  the first line and tests for the above  paper  sizes.   Finally,
                  string can be a custom paper size in the format length,width (no
                  spaces before and after the comma).  Both length and width  must
                  have  a  unit appended; valid values are 'i' for inches, 'c' for
                  centimeters, 'p'  for  points,  and  'P'  for  picas.   Example:
                  12c,235p.   An  argument  which  starts  with  a digit is always
                  treated as a custom paper format.  papersize sets both the  ver-
                  tical and horizontal dimension of the output medium.
    
                  Use  program  as  the spooler program for printing.  If omitted,
                  the -l and -L options of groff are ignored.
    
           res n  There are n machine units per inch.
    
           sizes s1 s2...sn 0
                  This means that the device has  fonts  at  s1,  s2,...sn  scaled
                  points.   The  list of sizes must be terminated by a 0.  Each si
                  can also be a range of sizes m-n.  The list can extend over more
                  than one line.
    
           sizescale n
                  The scale factor for pointsizes.  By default this has a value of
                  1.  One scaled point is equal to one point/n.  The arguments  to
                  the unitwidth and sizes commands are given in scaled points.
    
           styles S1 S2...Sm
                  The  first  m  font  positions  will  be  associated with styles
                  S1...Sm.
    
           tcommand
                  This means that the postprocessor can handle the t and u  output
                  commands.
    
           unitwidth n
                  Quantities  in  the  font  files  are given in machine units for
                  fonts whose point size is n scaled points.
    
           use_charnames_in_special
                  This command indicates that troff should encode named characters
                  inside special commands.
    
           vert n The vertical resolution is n machine units.
    
           The  res, unitwidth, fonts, and sizes lines are compulsory.  Other com-
           mands are ignored by troff but may be used by postprocessors  to  store
           arbitrary information about the device in the DESC file.
    
           Here a list of obsolete keywords which are recognized by groff but com-
           pletely ignored: spare1, spare2, biggestfont.
    
       Font file format
           A font file has two sections.  The first section is a sequence of lines
           each  containing a sequence of blank delimited words; the first word in
           the line is a key, and subsequent words give a value for that key.
    
           ligatures lig1 lig2...lign [0]
                  Characters lig1, lig2, ..., lign are ligatures;  possible  liga-
                  tures are ff, fi, fl, ffi and ffl.  For backwards compatibility,
                  the list of ligatures may be terminated with a 0.  The  list  of
                  ligatures may not extend over more than one line.
    
           Other commands are ignored by troff but may be used  by  postprocessors
           to store arbitrary information about the font in the font file.
    
           The first section can contain comments which start with the # character
           and extend to the end of a line.
    
           The second section contains one or two subsections.  It must contain  a
           charset  subsection  and  it  may  also contain a kernpairs subsection.
           These subsections can appear in any order.  Each subsection starts with
           a word on a line by itself.
    
           The  word  charset  starts the charset subsection.  The charset line is
           followed by a sequence of lines.  Each line gives information  for  one
           character.   A line comprises a number of fields separated by blanks or
           tabs.  The format is
    
                  name metrics type code [entity_name] [-- comment]
    
           name identifies the character: if name is a single character c then  it
           corresponds  to  the  groff  input character c; if it is of the form \c
           where c is a single character, then it corresponds to the special char-
           acter  \[c];  otherwise  it  corresponds  to  the groff input character
           \[name].  If it is exactly two characters xx it can be entered as \(xx.
           Note that single-letter special characters can't be accessed as \c; the
           only exception is '\-' which is identical to '\[-]'.  The name  ---  is
           special  and  indicates  that the character is unnamed; such characters
           can only be used by means of the \N escape sequence in troff.
    
           Groff supports eight-bit characters; however some utilities have diffi-
           culties with eight-bit characters.  For this reason, there is a conven-
           tion that the name charn is equivalent to the  single  character  whose
           code  is  n.  For example, char163 would be equivalent to the character
           with code 163 which is the pounds sterling sign in ISO Latin-1.
    
           The type field gives the character type:
    
           1      means the character has a descender, for example, p;
    
           2      means the character has an ascender, for example, b;
    
           3      means the character has both an ascender and  a  descender,  for
                  example, (.
    
           The code field gives the code which the postprocessor uses to print the
           character.  The character can also be input to groff using this code by
           means  of  the \N escape sequence.  The code can be any integer.  If it
           starts with a 0 it will be interpreted as octal; if it starts  with  0x
           or 0X it will be intepreted as hexadecimal.  Note, however, that the \N
           escape sequence only accepts a decimal integer.
    
           The entity_name field gives an ascii string identifying the glyph which
           the  postprocessor uses to print the character.  This field is optional
           fields  are  assumed  to be 0.  The subfields are all decimal integers.
           Since there is no  associated  binary  format,  these  values  are  not
           required  to  fit  into a variable of type char as they are in ditroff.
           The width subfields gives the width of the character.  The height  sub-
           field  gives  the  height  of the character (upwards is positive); if a
           character does not extend above the baseline, it should be given a zero
           height,  rather  than  a negative height.  The depth subfield gives the
           depth of the character, that is, the distance below  the  lowest  point
           below  the  baseline to which the character extends (downwards is posi-
           tive); if a character does not extend  below  above  the  baseline,  it
           should  be  given  a  zero  depth,  rather  than a negative depth.  The
           italic-correction subfield gives the amount of  space  that  should  be
           added  after  the  character when it is immediately to be followed by a
           character from a roman font.  The left-italic-correction subfield gives
           the  amount  of space that should be added before the character when it
           is immediately to be preceded by a character from a  roman  font.   The
           subscript-correction  gives  the  amount  of space that should be added
           after a character before adding a subscript.  This should be less  than
           the italic correction.
    
           A line in the charset section can also have the format
    
                  name "
    
           This  indicates  that  name is just another name for the character men-
           tioned in the preceding line.
    
           The word kernpairs starts  the  kernpairs  section.   This  contains  a
           sequence of lines of the form:
    
                  c1 c2 n
    
           This  means  that  when  character  c1 appears next to character c2 the
           space between them should be increased by n.  Most entries in kernpairs
           section will have a negative value for n.
    
    
    

    FILES

           /usr/share/groff/1.18.1.4/font/devname/DESC
                  Device description file for device name.
    
           /usr/share/groff/1.18.1.4/font/devname/F
                  Font file for font F of device name.
    
    
    

    SEE ALSO

           groff_out(5), troff(1).
    
    
    

    Groff Version 1.18.1.4 12 September 2002 GROFF_FONT(5)

    
    
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