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Changes to grep/manual/html_node/Environment-Variables.html,v
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From: |
Jim Meyering |
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Subject: |
Changes to grep/manual/html_node/Environment-Variables.html,v |
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Date: |
Sun, 30 Dec 2018 01:24:24 -0500 (EST) |
CVSROOT: /webcvs/grep
Module name: grep
Changes by: Jim Meyering <meyering> 18/12/30 01:24:22
Index: html_node/Environment-Variables.html
===================================================================
RCS file: /webcvs/grep/grep/manual/html_node/Environment-Variables.html,v
retrieving revision 1.28
retrieving revision 1.29
diff -u -b -r1.28 -r1.29
--- html_node/Environment-Variables.html 10 Feb 2017 04:43:38 -0000
1.28
+++ html_node/Environment-Variables.html 30 Dec 2018 06:24:22 -0000
1.29
@@ -2,7 +2,7 @@
<html>
<!-- This manual is for grep, a pattern matching engine.
-Copyright (C) 1999-2002, 2005, 2008-2017 Free Software Foundation,
+Copyright (C) 1999-2002, 2005, 2008-2018 Free Software Foundation,
Inc.
Permission is granted to copy, distribute and/or modify this document
@@ -11,16 +11,16 @@
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". -->
-<!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
+<!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->
<head>
-<title>GNU Grep 3.0: Environment Variables</title>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Environment Variables (GNU Grep 3.3)</title>
-<meta name="description" content="GNU Grep 3.0: Environment Variables">
-<meta name="keywords" content="GNU Grep 3.0: Environment Variables">
+<meta name="description" content="Environment Variables (GNU Grep 3.3)">
+<meta name="keywords" content="Environment Variables (GNU Grep 3.3)">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
-<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link href="index.html#Top" rel="start" title="Top">
<link href="Index.html#Index" rel="index" title="Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
@@ -306,6 +306,8 @@
<dd><a name="index-LC_005fALL-environment-variable-2"></a>
<a name="index-LC_005fCTYPE-environment-variable"></a>
<a name="index-LANG-environment-variable-2"></a>
+<a name="index-encoding-error"></a>
+<a name="index-null-character"></a>
<p>These variables specify the locale for the <code>LC_CTYPE</code> category,
which determines the type of characters,
e.g., which characters are whitespace.
@@ -313,6 +315,17 @@
text is encoded in UTF-8, ASCII, or some other encoding. In the
‘<samp>C</samp>’ or ‘<samp>POSIX</samp>’ locale, all
characters are encoded as a
single byte and every byte is a valid character.
+In more-complex encodings such as UTF-8, a sequence of multiple bytes
+may be needed to represent a character, and some bytes may be encoding
+errors that do not contribute to the representation of any character.
+POSIX does not specify the behavior of <code>grep</code> when patterns or
+input data contain encoding errors or null characters, so portable
+scripts should avoid such usage. As an extension to POSIX, GNU
+<code>grep</code> treats null characters like any other character.
+However, unless the <samp>-a</samp> (<samp>--binary-files=text</samp>) option
+is used, the presence of null characters in input or of encoding
+errors in output causes GNU <code>grep</code> to treat the file as binary
+and suppress details about matches. See <a
href="File-and-Directory-Selection.html#File-and-Directory-Selection">File and
Directory Selection</a>.
</p>
</dd>
<dt><code>LANGUAGE</code></dt>
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