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- .\" manual page for bsfilt(1)
- .\"
- .\"
- .\" Copyright (c) 1991 Purdue University Research Foundation,
- .\" West Lafayette, Indiana 47907. All rights reserved.
- .\"
- .\" Written by Victor A. Abell <abe@cc.purdue.edu>, Purdue University
- .\" Computing Center. Not derived from licensed software; derived from
- .\" awf(1) by Henry Spencer of the University of Toronto.
- .\"
- .\" Permission is granted to anyone to use this software for any
- .\" purpose on any computer system, and to alter it and redistribute
- .\" it freely, subject to the following restrictions:
- .\"
- .\" 1. The author is not responsible for any consequences of use of
- .\" this software, even if they arise from flaws in it.
- .\"
- .\" 2. The origin of this software must not be misrepresented, either
- .\" by explicit claim or by omission. Credits must appear in the
- .\" documentation.
- .\"
- .\" 3. Altered versions must be plainly marked as such, and must not
- .\" be misrepresented as being the original software. Credits must
- .\" appear in the documentation.
- .\"
- .\" 4. This notice may not be removed or altered.
- .\"
- .TH BSFILT 1 "February, 1991"
- .BY "Purdue University"
- .SH NAME
- bsfilt \- a colcrt-like backspace filter
- .SH SYNOPSIS
- .B bsfilt
- [
- .B -
- ] [
- .B -U
- ] [ file ... ]
- .SH DESCRIPTION
- .I Bsfilt
- filters backspace sequences from the input \fIfile\fR(s)
- (standard input if none)
- in an approximation of
- .IR 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
- .B \-
- and
- .B \-U
- options.
- .SH OPTIONS
- .TP
- .B \-
- specifies that no underlining of any kind is to be propagated.
- Without this option or the
- .B \-U
- option,
- .I bsfilt
- approximates underlining with minus signs (`-') in following lines.
- .TP
- .B \-U
- specifies that underlining with underscore (`_') and backspace (`\b')
- character sequences is permitted.
- .SH SEE ALSO
- cawf(1), colcrt(1) and nroff(1).
- .SH DIAGNOSTICS
- Diagnostic messages are delivered to the standard error file.
- .SH HISTORY
- Vic Abell of Purdue University wrote
- .I bsfilt
- to have a backspace filter for
- .IR cawf (1)
- that is independent of licensed source code.
- .SH BUGS
- The maximum length of a line that can be underlined with minus signs is
- fixed.
- .LP
- .I 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 `+'.
-