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