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Minix/2.0.0/wwwman/man1/bsfilt.1.html
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Minix/2.0.0/wwwman/man1/bsfilt.1.html
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<HTML>
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<HEAD>
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<TITLE>bsfilt(1)</TITLE>
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</HEAD>
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<BODY>
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<H1>bsfilt(1)</H1>
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<HR>
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<PRE>
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</PRE>
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<H2>NAME</H2><PRE>
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bsfilt, colcrt - a colcrt-like backspace filter
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</PRE>
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<H2>SYNOPSIS</H2><PRE>
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<STRONG>bsfilt</STRONG> [ <STRONG>-</STRONG> ] [ <STRONG>-U</STRONG> ] [ file ... ]
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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<EM>Bsfilt</EM> filters backspace sequences from the input <EM>file</EM>(s) (standard input
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if none) in an approximation of <STRONG><A HREF="../man1/colcrt.1.html">colcrt(1)</A></STRONG>. Both the backspace and the
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character it returns to are removed, unless they form an underline
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sequence. Underline sequences are treated according to the settings of
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the <STRONG>-</STRONG> and <STRONG>-U</STRONG> options.
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</PRE>
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<H2>OPTIONS</H2><PRE>
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<STRONG>-</STRONG> specifies that no underlining of any kind is to be propagated.
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Without this option or the <STRONG>-U</STRONG> option, <EM>bsfilt</EM> approximates
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underlining with minus signs (`-') in following lines.
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<STRONG>-U</STRONG> specifies that underlining with underscore (`_') and backspace (`b')
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character sequences is permitted.
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</PRE>
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<H2>SEE ALSO</H2><PRE>
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<STRONG><A HREF="../man1/cawf.1.html">cawf(1)</A></STRONG>, <STRONG><A HREF="../man1/colcrt.1.html">colcrt(1)</A></STRONG> and <STRONG><A HREF="../man1/nroff.1.html">nroff(1)</A></STRONG>.
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</PRE>
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<H2>DIAGNOSTICS</H2><PRE>
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Diagnostic messages are delivered to the standard error file.
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</PRE>
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<H2>HISTORY</H2><PRE>
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Vic Abell of Purdue University wrote <EM>bsfilt</EM> to have a backspace filter
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for <STRONG><A HREF="../man1/cawf.1.html">cawf(1)</A></STRONG> that is independent of licensed source code.
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</PRE>
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<H2>BUGS</H2><PRE>
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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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<EM>Bsfilt</EM> does not examine the characters that are being overprinted via
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backspace operations. Thus, overprinting that is intended to form a new
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character from several different ones is ineffective and only the last
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character of the sequence is propagated - e. g., ``o^H+'', intended to
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look like a bullet, is reduced to `+'.
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</PRE>
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</BODY>
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</HTML>
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