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FILTERM(1)               Linux User's Manual              FILTERM(1)

       filterm - filter terminal input and/or output

       filterm INPUT OUTPUT [COMMAND [ARGS]]

       Execute the specified COMMAND (default is the shell), filter‐
       ing terminal input and/or output.

       It can help e.g. when our terminal is unable to display  non-
       ASCII  characters or to enter them from the keyboard. It also
       makes writing various terminal filters easier.

       INPUT and OUTPUT are names of konwert's filters  -  they  are
       passed as the first argument to the konwert(1) program.  fil‐
       term - OUTPUT filters only output, and filterm INPUT  -  only

       The command - executes the shell as a login shell.

       It  differs  from konwert INPUT | COMMAND | konwert OUTPUT in
       that the command is executed on a pseudo-terminal,  so  full-
       screen programs work correctly.

       The  filters  have  to  output the characters as soon as they
       receive  all  necessary  input,  without  buffering.   trs(1)
       scripts  are  OK,  but  sed(1) or awk(1) or tr(1) scripts are
       not. In  C  you  may  use  read(),  getchar(),  fread(),  and
       write(),  but  putchar()  and  fwrite()  only  together  with
       fflush(stdout).  In C++: cin.get(), cout.put(), and cout  <<.
       In  perl:  sysread,  getc, read, and syswrite, but print only
       with $| = 1.

       The input filter will have set the environment variable  FIL‐
       TERM=in,  and  the  output  one - FILTERM=out.  This way some
       filters can slightly alter their behaviour when  working  for

       --help    display help and exit

       --version output version information and exit

       See konwert(1).  Additionally the following konwert's filters
       are designed only for filterm:

       tyldy (input)
              Polish ~a~c~e~l~n~o~s~x~z

       lewyap (input)
              Polish `a`c`e`l`n`o`s`x`z

       boldpl (output)
              ASCII with Polish letters shown as bold.

       pinectrlchars (output)
              Replaces the characters 128..159 shown by the Pine (or
              another program) as ^À..^ß back to the real 128..159.

       512bold (output)
              Changes  the  mapping of colors in 512-character mode,
              which restricts the number of  colors  to  eight.  The
              palette  is  dynamically  changed to contain the eight
              most recently used colors. When more colors  are  used
              at once, some of them display incorrectly.

       512bold1 (output)
              Changes  the  mapping of colors in 512-character mode.
              Instead of ignoring the intensity, the following  col‐
              ors  are  available:  black,  red, green, white, blue,
              light magenta, light cyan, light gray; others are sub‐
              stitutied   with  approximations.  This  gives  better
              effect, allowing to show the intensity, with the side-
              effect of belying the hue of some colors.

       kbdmacros (input)
              Keyboard  macros.  A  sequence of keys can be recorded
              with Esc Ctrl-A SEQUENCE Esc Ctrl-E SHORTCUT  -  after
              which, if you press the SHORTCUT, the SEQUENCE will be
              generated  instead.  Later  such  assignment  can   be
              deleted  with Esc Ctrl-A Esc Ctrl-E SHORTCUT Esc Ctrl-
              E.  Instead of Esc Ctrl- you  often  may  press  Ctrl-
              Alt-.   The defined shortcuts, together with the above
              redefinable key combinations used to define them,  are
              stored  in the ~/.kbdmacros file. Note: when you rede‐
              fine a sequence, all its prefixes will not  be  passed
              through  immediately,  but  wait until it can be unam‐
              biguously told which sequence was actually input. This
              includes  escape  sequences representing some extended


       512bold filter is not perfect. Some escape sequences  may  be
       emulated  incorrectly. Additionally, colors changed in multi‐
       ple steps or not used  unnecessarily  allocate  some  of  the
       eight colors.

       filterm  filters  terminal input and/or output. It forms part
       of the konwert package.

       Copyright (c) 1998 Marcin 'Qrczak' Kowalczyk

       This program is free software; you can redistribute it and/or
       modify  it  under the terms of the GNU General Public License
       as published by the Free Software Foundation; either  version
       2 of the License, or (at your option) any later version.

       This  program is distributed in the hope that it will be use‐
       ful, but WITHOUT ANY WARRANTY; without even the implied  war‐
       See the GNU General Public License for more details.

       You should have received a copy of  the  GNU  General  Public
       License  along  with  this program; if not, write to the Free
       Software Foundation, Inc., 59 Temple Place, Suite  330,  Bos‐
       ton, MA  02111-1307  USA

        __("<   Marcin Kowalczyk *
        \__/       GCS/M d- s+:-- a21 C+++>+++$ UL++>++++$ P+++ L++>++++$ E->++
         ^^                W++ N+++ o? K? w(---) O? M- V? PS-- PE++ Y? PGP->+ t
       QRCZAK                  5? X- R tv-- b+>++ DI D- G+ e>++++ h! r--%>++ y-

Konwert                      30 Jul 1998                  FILTERM(1)
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