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Интерактивная система просмотра системных руководств (man-ов)

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xdvi (1)
  • >> xdvi (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • xdvi (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
         xdvi - DVI Previewer for the X Window System
         xdvi [+[page]] [-s shrink] [-S density] [-nogrey] [-gamma g]
         [-install]   [-noinstall]   [-p   pixels]  [-margins  dimen]
         [-sidemargin  dimen]  [-topmargin  dimen]  [-offsets  dimen]
         [-xoffset   dimen]   [-yoffset   dimen]  [-paper  papertype]
         [-altfont  font]  [-nomakepk]  -mfmode  mode-def[:dpi]  [-l]
         [-rv]   [-expert]  [-shrinkbuttonn  shrink]  [-mgs[n]  size]
         [-warnspecials]   [-hush]   [-hushchars]    [-hushchecksums]
         [-hushspecials] [-safer] [-fg color] [-bg color] [-hl color]
         [-bd color] [-cr color] [-bw width] [-grid1  color]  [-grid2
         color]  [-grid3  color]  [-bw width] [-display host:display]
         [-geometry  geometry]  [-icongeometry  geometry]   [-iconic]
         [-font  font]  [-keep]  [-copy]  [-thorough] [-nopostscript]
         [-noscan]   [-allowshell]   [-noghostscript]    [-nogssafer]
         [-gsalpha]    [-interpreter   path]   [-gspalette   palette]
         [-underlink] [-browser WWWbrowser] [-base base URL]  [-debug
         bitmask] [-version] [dvi_file]
         xdvi is a program which runs under the X window  system.  It
         is  used  to  preview  dvi  files,  such  as are produced by
         This program has the capability of showing the file shrunken
         by  various  (integer)  factors, and also has a ``magnifying
         glass'' which allows one to see a small part of the unshrunk
         image momentarily.
         Before displaying any page or part thereof, it checks to see
         if  the  dvi  file  has  changed  since the last time it was
         displayed.  If this is the case, then xdvi will reinitialize
         itself  for  the  new  dvi  file.  For this reason, exposing
         parts of the xdvi window while  TeX  is  running  should  be
         avoided.   This  feature allows you to preview many versions
         of the same file while running xdvi only once.
         In addition to using keystrokes to  move  within  the  file,
         xdvi provides buttons on the right side of the window, which
         are synonymous with various sequences of keystrokes.
         xdvi can  show  PostScript<tm>  specials  by  any  of  three
         methods.   It  will try first to use Display PostScript<tm>,
         then NeWS, then it will try to use Ghostscript to render the
         images.   All of these options depend on additional software
         to work properly; moreover, some of them may not be compiled
         into this copy of xdvi.
         For performance reasons, xdvi  does  not  render  PostScript
         specials in the magnifying glass.
         If dvi_file is not specified,  a  file-selection  widget  is
         popped up for you to choose the dvi file.
         In addition to specifying the dvi file (with or without  the
         .dvi  extension),  xdvi  supports the following command line
         options.  If the option begins with a `+' instead of a  `-',
         the  option  is  restored to its default value.  By default,
         these options can be set via the  resource  names  given  in
         parentheses in the description of each option.
              Specifies the first  page  to  show.   If  +  is  given
              without  a  number, the last page is assumed; the first
              page is the default.
              (.allowShell) This option enables the shell  escape  in
              PostScript  specials.  (For security reasons, shell es-
              capes are disabled by default.)  This option should  be
              rarely  used;  in particular it should not be used just
              to uncompress files: that function is done automatical-
              ly  if the file name ends in .Z, .gz, or .bz2 Shell es-
              capes are always turned off if  the  -safer  option  is
         -altfont font
              (.altFont) Declares a default font to use when the font
              in  the  dvi file cannot be found.  This is useful, for
              example, with PostScript <tm> fonts.
         -background color
              (.background) Determines the color of  the  background.
              Same as -bg.
         -base base URL
              (.urlBase) Sets the base URL value that external  links
              given in the dvi file are assumed relative to - normal-
              ly this should be the URL of the document itself (?).
         -bd color
              (.borderColor) Determines the color of the window bord-
         -bg color
              (.background) Determines the color of the background.
         -bordercolor color
              Same as -bd.
         -borderwidth width
              (.borderWidth) Specifies the width of the border of the
              window.  Same as -bw.
         -browser WWWbrowser
              (.wwwBrowser) Defines the World Wide Web browser to  be
              used  to handle external URL's, for example mosaic.  If
              neither the command-line option nor the X resource  are
              set, uses the environment variable WWWBROWSER.
         -bw width
              (.borderWidth) Specifies the width of the border of the
              (.copy) Always use  the  copy  operation  when  writing
              characters  to  the display.  This option may be neces-
              sary for correct operation  on  a  color  display,  but
              overstrike  characters will be incorrect.  If greyscale
              anti-aliasing is in use, the -copy operation will  dis-
              able  the  use of colorplanes and make overstrikes come
              out incorrectly.  See also -thorough.
         -cr color
              (.cursorColor) Determines the color of the cursor.  The
              default is the color of the page border.
         -debug bitmask
              (.debugLevel) If nonzero, prints additional information
              on  standard  output.   The number is taken as a set of
              independent bits.  The meaning  of  each  bit  follows.
              1=bitmaps;  2=dvi  translation;  4=pk  reading; 8=batch
              operation; 16=events;  32=file  opening;  64=PostScript
              communication; 128=Kpathsea stat(2) calls; 256=Kpathsea
              hash  table  lookups;  512=Kpathsea  path  definitions;
              1024=Kpathsea  path  expansion; 2048=Kpathsea searches.
              To trace everything having to do  with  file  searching
              and opening, use 4000.  Some of these debugging options
              are actually provided by Kpathsea.  See  the  Debugging
              section in the Kpathsea manual.
         -density density
              (.densityPercent)  Determines  the  density  used  when
              shrinking bitmaps for fonts.  A higher value produces a
              lighter font.  The default value is 40.  If greyscaling
              is  in use this argument does not apply; use -gamma in-
              stead.  See also the `S'.  keystroke.  Same as -S
         -display host:display
              Specifies the host and screen to be used for displaying
              the dvi file.  By default this is obtained from the en-
              vironment variable DISPLAY.
              (.expert) Prevent the buttons from appearing.  See also
              the `x' keystroke.
         -fg color
              (.foreground) Determines the color of the  text  (fore-
         -foreground color
              Same as -fg.
         -font font
              (*font) Sets the font for use in the buttons.
         -gamma gamma
              (.gamma) Controls the interpolation of  colors  in  the
              greyscale  anti-aliasing  color palette.  Default value
              is 1.0.  For 0 < gamma < 1, the fonts will  be  lighter
              (more  like  the  background),  and  for gamma > 1, the
              fonts will be darker (more like the foreground).  Nega-
              tive  values  behave  the  same way, but use a slightly
              different algorithm.  For color and greyscale displays;
              for  monochrome,  see -density.  See also the `S' keys-
         -grid1 color
              (.grid1Color) Determines the color of level 1 grid (de-
              fault as foreground)
         -grid2 color
              (.grid2Color) Determines the color of level 2 grid (de-
              fault as foreground)
         -grid3 color
              (.grid3Color) Determines the color of level 3 grid (de-
              fault as foreground)
         -geometry geometry
              (*geometry) Specifies the initial geometry of the  win-
         -gspalette palette
              (.palette) Specifies the palette to be used when  using
              Ghostscript  for rendering PostScript specials.  Possi-
              ble values are Color, Greyscale, and  Monochrome.   The
              default is Color.
              (.gsAlpha) Causes Ghostscript to  be  called  with  the
              x11alpha   driver  instead  of  the  x11  driver.   The
              x11alpha driver  enables  anti-aliasing  in  PostScript
              figures,  for  a  nicer appearance.  It is available on
              newer versions of Ghostscript.  This option can also be
              toggled with the `V' keystroke.
         -hl color
              (.highlight) Determines the color of the  page  border.
              The default is the foreground color.
              (.Hush) Causes xdvi to suppress all suppressible  warn-
              (.hushLostChars) Causes xdvi to suppress warnings about
              references  to  characters which are not defined in the
              (.hushChecksums) Causes xdvi to suppress warnings about
              checksum  mismatches  between the dvi file and the font
              (.hushSpecials) Causes xdvi to suppress warnings  about
              \special strings that it cannot process.
         -icongeometry geometry
              (.iconGeometry) Specifies the initial position for  the
              (.iconic) Causes the xdvi window to start in the iconic
              state.  The default is to start with the window open.
              (.install) If xdvi is running under a PseudoColor visu-
              al, then (by default) it will check for TrueColor visu-
              als with more bits per pixel,  and  switch  to  such  a
              visual  if  one  exists.   If no such visual exists, it
              will use the current visual and colormap.  If  -install
              is  selected,  however,  it  will still use a TrueColor
              visual with a greater depth, if one is available;  oth-
              erwise, it will install its own colormap on the current
              visual.  If the current visual is not PseudoColor, then
              xdvi will not switch the visual or colormap, regardless
              of its options.   The  default  value  of  the  install
              resource is the special value, maybe.  There is no +in-
              stall option.  See also -noinstall, and the GREYSCALING
              AND COLORMAPS section.
         -interpreter filename
              (.interpreter) Use filename as the  Ghostscript  inter-
              preter.  By default it uses gs.
              (.keepPosition) Sets  a  flag  to  indicate  that  xdvi
              should  not  move to the home position when moving to a
              new page.  See also the `k' keystroke.
         -l   (.listFonts) Causes the names of the fonts used  to  be
         -margins dimen
              (.Margin) Specifies the size of both the top margin and
              side  margin.  This determines the ``home'' position of
              the page within the window as follows.  If  the  entire
              page  fits  in the window, then the margin settings are
              ignored.  If, even after removing the margins from  the
              left, right, top, and bottom, the page still cannot fit
              in the window, then the page is put in the window  such
              that  the  top and left margins are hidden, and presum-
              ably the upper left-hand corner of the text on the page
              will  be  in  the upper left-hand corner of the window.
              Otherwise, the text is centered in the window.  The di-
              mension  should be a decimal number optionally followed
              by any of the two-letter abbreviations  for  units  ac-
              cepted  by TeX (pt, pc, in, bp, cm, mm, dd, cc, or sp).
              By default, the unit will  be  cm  (centimeters).   See
              also -sidemargin, -topmargin, and the keystroke `M.'
         -mfmode mode-def
              (.mfMode) Specifies a mode-def  string,  which  can  be
              used  in  searching for fonts (see ENVIRONMENT, below).
              Generally, when  changing  the  mode-def,  it  is  also
              necessary  to  change  the font size to the appropriate
              value for that mode.  This is done by  adding  a  colon
              and  the  value  in dots per inch; for example, -mfmode
              ljfour:600.  This method overrides any value  given  by
              the pixelsPerInch resource or the -p command-line argu-
              ment.  The metafont mode is  also  passed  to  metafont
              during  automatic creation of fonts.  By default, it is
         -mgs size
              Same as -mgs1.
         -mgs[n] size
              (.magnifierSize[n]) Specifies the size of the window to
              be used for the ``magnifying glass'' for Button n.  The
              size may be given as an integer  (indicating  that  the
              magnifying  glass  is to be square), or it may be given
              in the form widthxheight.  See the MOUSE  ACTIONS  sec-
              tion.    Defaults   are   200x150,   400x250,  700x500,
              1000x800, and 1200x1200.
              (.ghostscript) Inhibits  the  use  of  Ghostscript  for
              displaying  PostScript<tm> specials.  (For this option,
              the logic of the corresponding  resource  is  reversed:
              -noghostscript    corresponds    to    ghostscript:off;
              +noghostscript to ghostscript:on.)
              (.grey) Turns off the use  of  greyscale  anti-aliasing
              when  printing shrunken bitmaps.  (For this option, the
              logic of the corresponding resource is reversed:   -no-
              grey corresponds to grey:off; +nogrey to grey:on.)  See
              also the `G' keystroke.
              (.gsSafer) Normally, if Ghostscript is used  to  render
              PostScript specials, the Ghostscript interpreter is run
              with the option -dSAFER.  The  -nogssafer  option  runs
              Ghostscript  without  -dSAFER.   The  -dSAFER option in
              Ghostscript  disables  PostScript  operators  such   as
              deletefile,  to  prevent  possibly malicious PostScript
              programs from having any effect.  If the -safer  option
              is  specified,  then this option has no effect; in that
              case Ghostscript is always run with -dSAFER.  (For  the
              -nogssafer  option,  the  logic  of  the  corresponding
              resource  is  reversed:   -nogssafer   corresponds   to
              gsSafer:off; +nogssafer to gsSafer:on.)
              (.install) Inhibit the default behavior of switching to
              a  TrueColor  visual if one is available with more bits
              per  pixel  than  the  current  visual.   This   option
              corresponds  to a resource of install:off.  There is no
              +noinstall option.  See also -install, and  the  GREYS-
              CALING AND COLORMAPS section.
              (.makePk) Turns off automatic generation of font  files
              that cannot be found by other means.  (For this option,
              the logic of the corresponding  resource  is  reversed:
              -nomakepk   corresponds  to  makePk:off;  +nomakepk  to
              (.postscript) Turns  off  rendering  of  PostScript<tm>
              specials.   Bounding boxes, if known, will be displayed
              instead.  This option can also be toggled with the  `v'
              keystroke.    (For   this  option,  the  logic  of  the
              corresponding  resource  is  reversed:    -nopostscript
              corresponds    to    postscript:off;   +postscript   to
              (.prescan) Normally, when PostScript<tm> is turned  on,
              xdvi  will  do  a  preliminary scan of the dvi file, in
              order to send any necessary header files before sending
              the  PostScript  code  that requires them.  This option
              turns off such prescanning.  (It will be  automatically
              be turned back on if xdvi detects any specials that re-
              quire headers.)  (For the -noscan option, the logic  of
              the   corresponding   resource  is  reversed:   -noscan
              corresponds to prescan:off; +noscan to prescan:on.)
         -offsets dimen
              (.Offset) Specifies the size of both the horizontal and
              vertical  offsets of the output on the page.  By decree
              of the Stanford TeX Project, the default TeX page  ori-
              gin  is  always  1 inch over and down from the top-left
              page corner, even when  non-American  paper  sizes  are
              used.   Therefore,  the  default  offsets are 1.0 inch.
              The argument dimen should be a decimal number optional-
              ly  followed by any of the two-letter abbreviations for
              units accepted by TeX (pt, pc, in, bp, cm, mm, dd,  cc,
              or sp).  By default, the unit will be cm (centimeters).
              See also -xoffset and -yoffset.
         -p pixels
              (.pixelsPerInch) Defines the size of the fonts to  use,
              in  pixels  per  inch.  The default value is 600.  This
              option is provided only  for  backwards  compatibility;
              the  preferred  way of setting the font size is by set-
              ting the Metafont  mode  at  the  same  time;  see  the
              -mfmode option.
         -paper papertype
              (.paper) Specifies the size of the printed page.   This
              may  be of the form widthxheight optionally followed by
              a unit, where width and height are decimal numbers giv-
              ing  the  width  and height of the paper, respectively,
              and the unit is any of the two-letter abbreviations for
              units  accepted by TeX (pt, pc, in, bp, cm, mm, dd, cc,
              or sp).  By default, the unit will be cm (centimeters).
              There   are  also  synonyms  which  may  be  used:   us
              (8.5x11in), usr (11x8.5in), legal (8.5x14in),  foolscap
              (13.5x17in),  as  well  as  the ISO sizes a1-a7, b1-b7,
              c1-c7, a1r-a7r (a1-a7 rotated), etc.  The default  size
              is 21 x 29.7 cm (A4 size).
         -rv  (.reverseVideo) Causes the page to  be  displayed  with
              white characters on a black background, instead of vice
         -s shrink
              (.shrinkFactor) Defines the initial shrink factor.  The
              default  value is 8.  If shrink is given as 0, then the
              initial shrink factor is computed so that the page fits
              within  the  window (as if the `s' keystroke were given
              without a number).
         -S density
              (.densityPercent) Same as -density, q.v.
              (.safer) This option turns on  all  available  security
              options;  it is designed for use when xdvi is called by
              a browser that obtains a dvi or TeX file  from  another
              site.    In  the  present  case,  this  option  selects
              +nogssafer and +allowshell.
         -shrinkbuttonn shrink
              (.shrinkButtonn) Specifies that the nth button changing
              shrink  factors  shall  change to shrink factor factor.
              This is not very usefull in the normal run  of  things.
              xdvik  scales  the scaling factors according to resolu-
              tion (currently 300dpi and 600dpi).  Here n  may  be  a
              number from 1 to 4.  Typical factors are powers of 2.
         -sidemargin dimen
              (.sideMargin) Specifies the side margin (see -margins).
              (.thorough) xdvi will usually try to ensure that  over-
              strike characters (e.g., \notin) are printed correctly.
              On monochrome displays, this is  always  possible  with
              one  logical  operation,  either  and  or or.  On color
              displays, however, this may take two operations, one to
              set  the  appropriate bits and one to clear other bits.
              If this is the case, then by default xdvi will  instead
              use  the  copy  operation,  which does not handle over-
              striking correctly.  The -thorough option  chooses  the
              slower but more correct choice.  See also -copy.
         -topmargin dimen
              (.topMargin) Specifies the top and bottom margins  (see
              (.underLink) Underline links.  Default is true.
              Print information on the version of xdvi.
              (.warnSpecials) Causes xdvi  to  issue  warnings  about
              \special strings that it cannot process.
         -xoffset dimen
              (.xOffset) Specifies the size of the horizontal  offset
              of the output on the page.  See -offsets.
         -yoffset dimen
              (.yOffset) Specifies the size of the vertical offset of
              the output on the page.  See -offsets.
         xdvi recognizes the following keystrokes when typed  in  its
         window.   Each  may optionally be preceded by a (positive or
         negative) number, whose interpretation will  depend  on  the
         particular  keystroke.  Also, the ``Help'', ``Home'', ``Pri-
         or'', ``Next'', and arrow cursor keys are synonyms for  `?',
         `^', `b', `f', `l', `r', `u', and `d' keys, respectively.
         q    Quits the program.  Control-C  and  control-D  will  do
              this, too.
         Q    Quits the program with exit status 2.
         n    Moves to the next page (or to the nth next  page  if  a
              number is given).  Synonyms are `f', Space, Return, and
              Line Feed.
         p    Moves to the previous page (or back n pages).  Synonyms
              are `b', control-H, and Delete.
         g    Moves to the page with the  given  number.   Initially,
              the first page is assumed to be page number 1, but this
              can be changed with the `P' keystroke,  below.   If  no
              page number is given, then it goes to the last page.
         P    ``This is page number n.''  This can be  used  to  make
              the  `g' keystroke refer to actual page numbers instead
              of absolute page numbers.
              Redisplays the current page.
         ^    Move to the ``home'' position of  the  page.   This  is
              normally  the  upper  left-hand  corner  of  the  page,
              depending on the margins as described in  the  -margins
              option, above.
         u    Moves up two thirds of a window-full.
         d    Moves down two thirds of a window-full.
         l    Moves left two thirds of a window-full.
         r    Moves right two thirds of a window-full.
         c    Moves the page so that the point currently beneath  the
              cursor  is  moved to the middle of the window.  It also
              (gasp!) warps the cursor to the same place.
         M    Sets the margins so that the point currently under  the
              cursor is the upper left-hand corner of the text in the
              page.  Note that this command itself does not move  the
              image at all.  For details on how the margins are used,
              see the -margins option.
         s    Changes the shrink factor to the given number.   If  no
              number is given, the smallest factor that makes the en-
              tire page fit in the window will be used.  (Margins are
              ignored in this computation.)
         S    Sets the density factor to be used when shrinking  bit-
              maps.   This  should  be  a  number  between 0 and 100;
              higher numbers produce lighter characters.   If  greys-
              caling  mode  is  in  effect, this changes the value of
              gamma instead.  The new value of  gamma  is  the  given
              number divided by 100; negative values are allowed.
         t    Toggles to the next unit in a sorted list of TeX dimen-
              sion units for the popup magnifier ruler.
         R    Forces the dvi file to be reread.  This allows  you  to
              preview  many  versions  of the same file while running
              xdvi only once.
         k    Normally when xdvi switches pages, it moves to the home
              position  as  well.  The `k' keystroke toggles a `keep-
              position' flag which, when set, will keep the same  po-
              sition  when  moving between pages.  Also `0k' and `1k'
              clear and set this flag, respectively.   See  also  the
              -keep option.
         x    Toggles expert mode (in which the buttons  do  not  ap-
              pear).   Also  `0x' and `1x' clear and reset this mode,
              respectively.  See also the -expert option.
         G    This key toggles the use of greyscale anti-aliasing for
              displaying  shrunken bitmaps.  In addition, the key se-
              quences `0G' and `1G' clear and set this flag,  respec-
              tively.  See also the -nogrey option.
         If given a numeric argument that is not 0  or  1,  greyscale
         anti-aliasing is turned on, and the gamma resource is set to
         the value divided by 100. E.g., `150G'  turns  on  greyscale
         and sets gamma to 1.5.
         D    This key toggles the use of grid over the document.  If
              no  number is given, the grid mode toggles. By prepend-
              ing number, 3 grid levels can be set.  The grid in each
              level  is  drawn in the colour specified.  See also the
              -grid1, -grid2, and -grid3 options.
         v    This key toggles the rendering of  PostScript<tm>  spe-
              cials.  If rendering is turned off, then bounding boxes
              are displayed when available.  In addition the key  se-
              quences  `0v' and `1v' clear and set this flag, respec-
              tively.  See also the -nopostscript option.
         V    This key toggles tha  anti-aliasing  of  PostScript<tm>
              specials  when Ghostscript is used as renderer.  In ad-
              dition the key sequences `0V' and `1V'  clear  and  set
              this flag, See also the +.B -gsalpha option.
         F    Read a new dvi file. A file-selection widget is  popped
              up for you to choose the dvi file from.
         If the shrink factor is set to any number  other  than  one,
         then  clicking  mouse  button  3  will pop up a ``magnifying
         glass'' which shows the unshrunk image in  the  vicinity  of
         the  mouse  click.  This subwindow disappears when the mouse
         button is released.  Different mouse  buttons  produce  dif-
         ferent sized windows, as indicated by the -mgs option.  Mov-
         ing the cursor while holding the button down will  move  the
         magnifying glass.
         If the cursor is on a  hypertext  link  (underlined  by  de-
         fault),  then  that  link overrides the magnifying glass for
         Buttons 1 and 2.  If Button 1 is clicked over a  link,  then
         xdvi jumps to the target in the current window.  If Button 2
         is clicked over a link, then xdvi opens a new window on  the
         More precisely, for internal links, Button 1  jumps  in  the
         same window to the link, while Button 2 starts up a new xdvi
         on the link.  For external links  to  dvi  files,  Button  1
         changes the current xdvi to be reading that file, while But-
         ton 2 starts a new xdvi on that file.  For other file types,
         mime.types  and  mailcap are parsed to determine the viewer;
         finally, if no suitable mailcap  entry  was  found,  if  the
         WWWBROWSER  environment  variable  is  set,  or -browser was
         specified on the command line, it is started up on the file.
         The scrollbars (if present)  behave  in  the  standard  way:
         pushing  Button  2 in a scrollbar moves the top or left edge
         of the scrollbar to that  point  and  optionally  drags  it;
         pushing  Button  1  moves the image up or right by an amount
         equal to the distance from the button  press  to  the  upper
         left-hand  corner  of the window; pushing Button 3 moves the
         image down or left by the same amount.
         When xdvi receives a SIGUSR1  signal,  it  rereads  the  dvi
         The greyscale anti-aliasing feature in xdvi will not work at
         its  best  if the display does not have enough colors avail-
         able.  This can happen if other applications are using  most
         of  the  colormap (even if they are iconified).  If this oc-
         curs, then xdvi will print an error message and turn on  the
         -copy option.  This will result in overstrike characters ap-
         pearing wrong; it may also result in poor display quality if
         the number of available colors is very small.
         Typically this problem  occurs  on  displays  that  allocate
         eight  bits of video memory per pixel.  To see how many bits
         per pixel your display uses, type xwininfo in an xterm  win-
         dow, and then click the mouse on the root window when asked.
         The ``Depth:'' entry will tell you how many bits  are  allo-
         cated per pixel.
         Displays using at least 15  bits  per  pixel  are  typically
         TrueColor  visuals,  which  do  not have this problem, since
         their colormap is permanently allocated and available to all
         applications.   (The  visual  class  is  also  displayed  by
         xwininfo.)  For more information on visual classes  see  the
         documentation for the X Window System.
         To alleviate this problem, therefore, one may (a)  run  with
         more  bits  per  pixel  (this  may require adding more video
         memory or replacing the video card), (b) shut down other ap-
         plications  that  may be using much of the colormap and then
         restart xdvi, or (c) run xdvi with the -install option.
         One application which is often the cause of this problem  is
         Netscape.   In  this case there are two more alternatives to
         remedying the situation.  One can run ``netscape  -install''
         to  cause  Netscape to install a private colormap.  This can
         cause colors to change in bizarre ways  when  the  mouse  is
         moved  to  a  different  window.  Or, one can run ``netscape
         -ncols 220'' to  limit  Netscape  to  a  smaller  number  of
         colors.   A  smaller  number will ensure that other applica-
         tions have more colors available, but will degrade the color
         quality in the Netscape window.
         Please see the kpathsea documentation.
         xdvi can display PostScript files included in the dvi  file.
         Such files are first searched for in the directory where the
         dvi file is, and then using normal Kpathsea rules.  There is
         an exception to this, however:  if the file name begins with
         a backtick (`), then the remaining characters  in  the  file
         name  give  a  shell command (often zcat) which is executed;
         its standard output  is  then  sent  to  be  interpreted  as
         PostScript.   Note that there is some potential for security
         problems here; see the -allowshell command-line option.   It
         is better to use compressed files directly (see below).
         If a file name is given (as opposed to a shell command),  if
         that  file  name ends in ``.Z'', ``.gz'', or ``.bz2'' and if
         the first two  bytes  of  the  file  indicate  that  it  was
         compressed  with  compress(1),  gzip(1), or bzip2(1) respec-
         tively, then the file is first uncompressed with  uncompress
         -c,  gunzip  -c,  or bunzip2 -c, respectively.  This is pre-
         ferred over using a backtick to call the  command  directly,
         since  you  do  not have to specify -allowshell and since it
         allows for path searching.
         xdvik uses the same environment variables and algorithms for
         finding  font  files as TeX and friends.  See the documenta-
         tion for the Kpathsea library for details (repeating it here
         is  too cumbersome).  In addition, xdvik accepts the follow-
         ing variables:
              Specifies which graphics display terminal to use.
              Trace Kpathsea lookups; set it to -1 for complete trac-
              Directory containing the mime.types file,  if  ~/.mime-
              types does not exist.
              Directory containing the .mailcap file,  if  ~/.mailcap
              does not exist.
              The browser used to open URL's, if neither the -browser
              option  nor the .wwwBrowser resource are set.  For more
              information on hyper-TeX support, see  the  `Hypertext'
              node in the dvipsk manual.
              The directory to use for storing temporary files creat-
              ed when uncompressing PostScript files.
         xdvi accepts many but not all types of  PostScript  specials
         accepted  by  dvips.   For example, it accepts most specials
         generated by epsf and psfig, It does not,  however,  support
         bop-hook  or eop-hook, nor does it allow PostScript commands
         to affect the rendering of things that  are  not  PostScript
         (for example, the ``NEAT'' and rotated ``A'' examples in the
         dvips manual).  These restrictions are due to the design  of
         xdvi; in all likelihood they will always remain.
         LaTeX2e color and rotation specials are not  currently  sup-
         Please see the kpathsea documentation.
         xdvi itself is Copyrighted by  Paul  Vojta  and  distributed
         under  the  X-Consortium  license.  xdvi uses the libwww li-
         brary of the World Wide Web Consortium, which includes  com-
         puter  software creaded and made available by CERN.  It also
         uses the kpathsea library which is distributed under the GNU
         LIBRARY General Public License.
         X(1), dvips(1), Kpathseadocumentation
         Eric Cooper, CMU, did a version for direct output to a QVSS.
         Modified for X by Bob Scheifler, MIT Laboratory for Computer
         Science. Modified for X11 by Mark Eichin, MIT  SIPB.  +Addi-
         tional  enhancements by many others.  The current maintainer
         of the original xdvi is Paul Vojta, U.C. Berkeley; the main-
         tainer  of  the xdvik variant is Nicolai Langfeldt, Dept. of
         Math, UiO, Norway, with the help of many others.

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