XScreenSaver(1)                                                XScreenSaver(1)


       phosphor - simulates an old terminal with long-sustain phosphor


       phosphor  [-display  host:display.screen]  [-window] [-root] [-install]
       [-visual visual] [-font font] [-scale int] [-ticks int] [-delay  usecs]
       [-program command] [-meta] [-esc] [-bs] [-del]


       The phosphor program draws text on the screen in a very large pixelated
       font that looks like an old low resolution dumb tty.  The pixels  flare
       and  fade  out  as if the phosphor was very long-sustain.  It is also a
       fully functional vt100 terminal emulator.


       phosphor accepts the following options:

       -window Draw on a newly-created window.  This is the default.

       -root   Draw on the root window.

               Install a private colormap for the window.

       -visual visual
               Specify which visual to use.  Legal values are the  name  of  a
               visual  class,  or the id number (decimal or hex) of a specific

       -font font-name
               The X font to use.  Phosphor can take any font and scale it  up
               to pixelate it.  The default is fixed.

       -scale int
               How much to scale the font up: in other words, the size in real
               pixels of the simulated pixels.  Default 6.

       -ticks int
               The number of colors to use when fading to black.  Default  20.

       -delay usecs
               The  speed  of  the  terminal: how long to wait between drawing
               each character.  Default 50000, or about 1/20th second.

       -pty    Launch the sub-program under a PTY, so that it can address  the
               screen directly.  This is the default.

       -pipe   Launch  the  sub-program  at  the  end of a pipe: do not let it
               address the screen directly.

       -program sh-command
               The command to run to  generate  the  text  to  display.   This
               option  may  be  any string acceptable to /bin/sh.  The program
               will be run at the end of a pty or  pipe,  and  any  characters
               that  it prints to stdout will be printed on phosphor’s window.
               The characters will be printed artificially slowly, as per  the
               -delay option above.  If the program exits, it will be launched
               again after 5 seconds.

               For example:

                    phosphor -program ’cat /usr/src/linux*/README’
                    phosphor -program ’ping localhost’
                    phosphor -program ’ps -e’
                    phosphor -program ’od -txC -w6 /dev/random’
                    phosphor -program ’cat /dev/random’
                    phosphor -scale 2 -geom =1280x1024 -program ’top’
                    phosphor -scale 4 -geom =1280x1024 \
                             -program ’mtr’
                    phosphor -program ’xemacs -nw -q -f life’
                    phosphor -scale 5 -geom =1280x1024 \
                             -program ’xemacs -nw -q --eval "(hanoi 5)"’

               If you have the festival(1)  text-to-speech  system  installed,
               you can have it read the screen as phosphor prints it:

                    phosphor -program \
                        ’xscreensaver-text | tee /dev/stderr | festival --tts’

               You  can  also  use  phosphor  as  a  lo-fi replacement for the
               xterm(1) and gnome-terminal(1) terminal emulators:

                    phosphor -delay 0 -program tcsh

       -esc    When the user types a key with the Alt or Meta keys held  down,
               send an ESC character first.  This is the default.

       -meta   When Meta or Alt are held down, set the high bit on the charac-
               ter instead.

       -del    Swap Backspace and Delete.  This is the default.

       -bs     Do not swap Backspace and Delete.


       By default, phosphor allocates a pseudo-tty for the sub-process to  run
       under.   This  has  the  desirable side effect that the program will be
       able to use ioctl(2) to fetch information about terminal parameters and
       window size, which many programs (such as top(1)) need to run properly.
       phosphor will also set the environment variable TERM to  vt100  in  the
       child process.

       Any characters typed on the phosphor window will be passed along to the
       sub-process.  (Note that this only works when running in "window" mode,
       not when running in -root mode under xscreensaver.)


       DISPLAY to get the default host and display number.

               to  get  the  name of a resource file that overrides the global
               resources stored in the RESOURCE_MANAGER property.

       TERM    to inform the sub-process of the type of terminal emulation.


       xscreensaver(1),  xscreensaver-text(1),  fortune(1),  apple2(1),  star-
       wars(1),  fontglide(1), ljlatest(1), dadadodo(1), webcollage(1), drift-
       net(1) EtherPEG, EtherPeek, console_codes(4).


       Copyright © 1999 by Jamie Zawinski.  Permission to use,  copy,  modify,
       distribute,  and  sell this software and its documentation for any pur-
       pose is hereby granted without fee, provided that the  above  copyright
       notice  appear  in  all  copies and that both that copyright notice and
       this permission notice appear in supporting documentation.   No  repre-
       sentations  are  made  about  the  suitability of this software for any
       purpose.  It is provided "as is" without express or implied warranty.


       Jamie Zawinski <>, 27-Apr-99.  Pty and  vt100  emulation  by
       Fredrik Tolf <>.

X Version 11                      5-May-2004                   XScreenSaver(1)

Man(1) output converted with man2html