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BSFILT(1)                   General Commands Manual                  BSFILT(1)

NAME
       bsfilt, colcrt - a colcrt-like backspace filter

SYNOPSIS
       bsfilt [ - ] [ -U ] [ file ... ]

DESCRIPTION
       Bsfilt  filters  backspace  sequences  from the input file(s) (standard
       input if none) in an approximation of colcrt(1).   Both  the  backspace
       and  the  character  it  returns  to  are  removed, unless they form an
       underline sequence.  Underline sequences are treated according  to  the
       settings of the - and -U options.

OPTIONS
       -      specifies  that  no underlining of any kind is to be propagated.
              Without this  option  or  the  -U  option,  bsfilt  approximates
              underlining with minus signs (`-') in following lines.

       -U     specifies  that  underlining with underscore (`_') and backspace
              (`) character sequences is permitted.

SEE ALSO
       cawf(1), colcrt(1) and nroff(1).

DIAGNOSTICS
       Diagnostic messages are delivered to the standard error file.

HISTORY
       Vic Abell of Purdue University wrote bsfilt to have a backspace  filter
       for cawf(1) that is independent of licensed source code.

BUGS
       The maximum length of a line that can be underlined with minus signs is
       fixed.

       Bsfilt does not examine the characters that are being  overprinted  via
       backspace  operations.   Thus,  overprinting that is intended to form a
       new character from several different ones is ineffective and  only  the
       last  character  of  the  sequence  is  propagated  -  e. g., ``o^H+'',
       intended to look like a bullet, is reduced to `+'.

                                February, 1991                       BSFILT(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO | DIAGNOSTICS | HISTORY | BUGS