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Changes to manual/html_node/Context-Line-Control.html
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From: |
Karl Berry |
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Subject: |
Changes to manual/html_node/Context-Line-Control.html |
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Date: |
Sun, 24 May 2009 18:43:07 +0000 |
CVSROOT: /web/grep
Module name: grep
Changes by: Karl Berry <karl> 09/05/24 18:43:01
Index: manual/html_node/Context-Line-Control.html
===================================================================
RCS file: manual/html_node/Context-Line-Control.html
diff -N manual/html_node/Context-Line-Control.html
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ manual/html_node/Context-Line-Control.html 24 May 2009 18:42:58 -0000
1.1
@@ -0,0 +1,80 @@
+<html lang="en">
+<head>
+<title>Context Line Control - GNU Grep 2.5.4</title>
+<meta http-equiv="Content-Type" content="text/html">
+<meta name="description" content="GNU Grep 2.5.4">
+<meta name="generator" content="makeinfo 4.13">
+<link title="Top" rel="start" href="index.html#Top">
+<link rel="up" href="Command_002dline-Options.html#Command_002dline-Options"
title="Command-line Options">
+<link rel="prev"
href="Output-Line-Prefix-Control.html#Output-Line-Prefix-Control" title="Output
Line Prefix Control">
+<link rel="next"
href="File-and-Directory-Selection.html#File-and-Directory-Selection"
title="File and Directory Selection">
+<link href="http://www.gnu.org/software/texinfo/"; rel="generator-home"
title="Texinfo Homepage">
+<!--
+This manual is for `grep', a pattern matching engine.
+
+Copyright (C) 1999, 2000, 2001, 2002, 2005, 2008, 2009 Free
+Software Foundation, Inc.
+
+ Permission is granted to copy, distribute and/or modify this
+ document under the terms of the GNU Free Documentation License,
+ Version 1.3 or any later version published by the Free Software
+ Foundation; with no Invariant Sections, with no Front-Cover Texts,
+ and with no Back-Cover Texts. A copy of the license is included
+ in the section entitled ``GNU Free Documentation License''.
+ -->
+<meta http-equiv="Content-Style-Type" content="text/css">
+<style type="text/css"><!--
+ pre.display { font-family:inherit }
+ pre.format { font-family:inherit }
+ pre.smalldisplay { font-family:inherit; font-size:smaller }
+ pre.smallformat { font-family:inherit; font-size:smaller }
+ pre.smallexample { font-size:smaller }
+ pre.smalllisp { font-size:smaller }
+ span.sc { font-variant:small-caps }
+ span.roman { font-family:serif; font-weight:normal; }
+ span.sansserif { font-family:sans-serif; font-weight:normal; }
+--></style>
+</head>
+<body>
+<div class="node">
+<a name="Context-Line-Control"></a>
+<p>
+Next: <a rel="next" accesskey="n"
href="File-and-Directory-Selection.html#File-and-Directory-Selection">File and
Directory Selection</a>,
+Previous: <a rel="previous" accesskey="p"
href="Output-Line-Prefix-Control.html#Output-Line-Prefix-Control">Output Line
Prefix Control</a>,
+Up: <a rel="up" accesskey="u"
href="Command_002dline-Options.html#Command_002dline-Options">Command-line
Options</a>
+<hr>
+</div>
+
+<h4 class="subsection">2.1.5 Context Line Control</h4>
+
+<p>Regardless of how these options are set,
+<samp><span class="command">grep</span></samp> will never print any given line
more than once.
+If the ‘<samp><span class="samp">-o</span></samp>’ or
‘<samp><span class="samp">--only-matching</span></samp>’ option is
specified,
+these options have no effect and a warning is given upon their use.
+
+ <dl>
+<dt>‘<samp><span class="samp">-A
</span><var>num</var></samp>’<dt>‘<samp><span
class="samp">--after-context=</span><var>num</var></samp>’<dd><a
name="index-g_t_002dA-76"></a><a
name="index-g_t_002d_002dafter_002dcontext-77"></a><a
name="index-after-context-78"></a><a
name="index-context-lines_002c-after-match-79"></a>Print <var>num</var> lines
of trailing context after matching lines.
+
+ <br><dt>‘<samp><span class="samp">-B
</span><var>num</var></samp>’<dt>‘<samp><span
class="samp">--before-context=</span><var>num</var></samp>’<dd><a
name="index-g_t_002dB-80"></a><a
name="index-g_t_002d_002dbefore_002dcontext-81"></a><a
name="index-before-context-82"></a><a
name="index-context-lines_002c-before-match-83"></a>Print <var>num</var> lines
of leading context before matching lines.
+
+ <br><dt>‘<samp><span class="samp">-C
</span><var>num</var></samp>’<dt>‘<samp><span
class="samp">-</span><var>num</var></samp>’<dt>‘<samp><span
class="samp">--context=</span><var>num</var></samp>’<dd><a
name="index-g_t_002dC-84"></a><a name="index-g_t_002d_002dcontext-85"></a><a
name="index-g_t_002d_0040var_007bnum_007d-86"></a><a
name="index-context-87"></a>Print <var>num</var> lines of leading and trailing
output context.
+
+ </dl>
+
+ <p>Matching lines normally use ‘<samp><span
class="samp">:</span></samp>’ as a separator
+between prefix fields and actual line content.
+Context (i.e., non-matching) lines use ‘<samp><span
class="samp">-</span></samp>’ instead.
+When no context is specified,
+matching lines are simply output one right after another.
+When nonzero context is specified,
+lines that are adjacent in the input form a group
+and are output one right after another,
+but disjoint groups of lines are separated by a ‘<samp><span
class="samp">--</span></samp>’
+without any prefix and on a line of its own.
+Each group may contain several matching lines
+when they are close enough to each other
+that two otherwise adjacent but divided groups connect
+and can just merge into a single contiguous one.
+
+ </body></html>
+
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