BSFILT.1
资源名称:os_source.zip [点击查看]
上传用户:datang2001
上传日期:2007-02-01
资源大小:53269k
文件大小:3k
源码类别:
操作系统开发
开发平台:
C/C++
- ." 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@mace.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, colcrt - a colcrt-like backspace filter
- .SH SYNOPSIS
- .B bsfilt
- [
- .B -
- ] [
- .B -U
- ] [ file ... ]
- .SH DESCRIPTION
- .I Bsfilt
- filters backspace sequences from the input fIfilefR(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 `+'.