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Changes to grep/manual/html_node/Environment-Variables.html,v
|
From: |
Jim Meyering |
|
Subject: |
Changes to grep/manual/html_node/Environment-Variables.html,v |
|
Date: |
Sat, 14 Aug 2021 16:46:43 -0400 (EDT) |
CVSROOT: /webcvs/grep
Module name: grep
Changes by: Jim Meyering <meyering> 21/08/14 16:46:41
Index: html_node/Environment-Variables.html
===================================================================
RCS file: /webcvs/grep/grep/manual/html_node/Environment-Variables.html,v
retrieving revision 1.31
retrieving revision 1.32
diff -u -b -r1.31 -r1.32
--- html_node/Environment-Variables.html 28 Sep 2020 03:36:49 -0000
1.31
+++ html_node/Environment-Variables.html 14 Aug 2021 20:46:40 -0000
1.32
@@ -1,8 +1,11 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd";>
<html>
+<!-- Created by GNU Texinfo 6.8, https://www.gnu.org/software/texinfo/ -->
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<!-- This manual is for grep, a pattern matching engine.
-Copyright (C) 1999-2002, 2005, 2008-2020 Free Software Foundation,
+Copyright (C) 1999-2002, 2005, 2008-2021 Free Software Foundation,
Inc.
Permission is granted to copy, distribute and/or modify this document
@@ -11,71 +14,61 @@
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 6.5, http://www.gnu.org/software/texinfo/ -->
-<head>
-<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
-<title>Environment Variables (GNU Grep 3.5)</title>
+<title>Environment Variables (GNU Grep 3.7)</title>
-<meta name="description" content="Environment Variables (GNU Grep 3.5)">
-<meta name="keywords" content="Environment Variables (GNU Grep 3.5)">
+<meta name="description" content="Environment Variables (GNU Grep 3.7)">
+<meta name="keywords" content="Environment Variables (GNU Grep 3.7)">
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<meta name="Generator" content="makeinfo">
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+<meta name="viewport" content="width=device-width,initial-scale=1">
+
+<link href="index.html" rel="start" title="Top">
+<link href="Index.html" rel="index" title="Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
-<link href="Invoking.html#Invoking" rel="up" title="Invoking">
-<link href="Exit-Status.html#Exit-Status" rel="next" title="Exit Status">
-<link href="Other-Options.html#Other-Options" rel="prev" title="Other Options">
+<link href="Invoking.html" rel="up" title="Invoking">
+<link href="Exit-Status.html" rel="next" title="Exit Status">
+<link href="Command_002dline-Options.html" rel="prev" title="Command-line
Options">
<style type="text/css">
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+a.copiable-anchor {visibility: hidden; text-decoration: none; line-height: 0em}
a.summary-letter {text-decoration: none}
blockquote.indentedblock {margin-right: 0em}
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div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
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pre.display {font-family: inherit}
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span.nolinebreak {white-space: nowrap}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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-->
</style>
-<link rel="stylesheet" type="text/css" href="/software/gnulib/manual.css">
+<link rel="stylesheet" type="text/css"
href="https://www.gnu.org/software/gnulib/manual.css";>
</head>
<body lang="en">
-<a name="Environment-Variables"></a>
+<div class="section" id="Environment-Variables">
<div class="header">
<p>
-Next: <a href="Exit-Status.html#Exit-Status" accesskey="n" rel="next">Exit
Status</a>, Previous: <a
href="Command_002dline-Options.html#Command_002dline-Options" accesskey="p"
rel="prev">Command-line Options</a>, Up: <a href="Invoking.html#Invoking"
accesskey="u" rel="up">Invoking</a> [<a href="index.html#SEC_Contents"
title="Table of contents" rel="contents">Contents</a>][<a
href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
+Next: <a href="Exit-Status.html" accesskey="n" rel="next">Exit Status</a>,
Previous: <a href="Command_002dline-Options.html" accesskey="p"
rel="prev">Command-line Options</a>, Up: <a href="Invoking.html" accesskey="u"
rel="up">Invoking <code>grep</code></a> [<a
href="index.html#SEC_Contents" title="Table of contents"
rel="contents">Contents</a>][<a href="Index.html" title="Index"
rel="index">Index</a>]</p>
</div>
<hr>
-<a name="Environment-Variables-1"></a>
-<h3 class="section">2.2 Environment Variables</h3>
+<span id="Environment-Variables-1"></span><h3 class="section">2.2 Environment
Variables</h3>
<p>The behavior of <code>grep</code> is affected
by the following environment variables.
</p>
-<a name="index-LANGUAGE-environment-variable"></a>
-<a name="index-LC_005fALL-environment-variable"></a>
-<a name="index-LC_005fMESSAGES-environment-variable"></a>
-<a name="index-LANG-environment-variable"></a>
+<span id="index-LANGUAGE-environment-variable"></span>
+<span id="index-LC_005fALL-environment-variable"></span>
+<span id="index-LC_005fMESSAGES-environment-variable"></span>
+<span id="index-LANG-environment-variable"></span>
<p>The locale for category <code><span
class="nolinebreak">LC_</span><var>foo</var></code><!-- /@w -->
is specified by examining the three environment variables
<code>LC_ALL</code>, <code><span
class="nolinebreak">LC_</span><var>foo</var></code><!-- /@w -->, and
<code>LANG</code>,
@@ -129,31 +122,11 @@
These capabilities are stored in an online database and accessed by
the <code>terminfo</code> library.
</p>
-<a name="index-environment-variables"></a>
+<span id="index-environment-variables"></span>
<dl compact="compact">
-<dt><code>GREP_OPTIONS</code></dt>
-<dd><a name="index-GREP_005fOPTIONS-environment-variable"></a>
-<a name="index-default-options-environment-variable"></a>
-<p>This variable specifies default options to be placed in front of any
-explicit options.
-As this causes problems when writing portable scripts, this feature
-will be removed in a future release of <code>grep</code>, and <code>grep</code>
-warns if it is used. Please use an alias or script instead.
-For example, if <code>grep</code> is in the directory
‘<samp>/usr/bin</samp>’ you
-can prepend <samp>$HOME/bin</samp> to your <code>PATH</code> and create an
-executable script <samp>$HOME/bin/grep</samp> containing the following:
-</p>
-<div class="example">
-<pre class="example">#! /bin/sh
-export PATH=/usr/bin
-exec grep --color=auto --devices=skip "$@"
-</pre></div>
-
-</dd>
-<dt><code>GREP_COLOR</code></dt>
-<dd><a name="index-GREP_005fCOLOR-environment-variable"></a>
-<a name="index-highlight-markers"></a>
+<dt
id='index-GREP_005fCOLOR-environment-variable'><span><code>GREP_COLOR</code><a
href='#index-GREP_005fCOLOR-environment-variable' class='copiable-anchor'>
¶</a></span></dt>
+<dd><span id="index-highlight-markers"></span>
<p>This variable specifies the color used to highlight matched (non-empty)
text.
It is deprecated in favor of <code>GREP_COLORS</code>, but still supported.
The ‘<samp>mt</samp>’, ‘<samp>ms</samp>’, and
‘<samp>mc</samp>’ capabilities of <code>GREP_COLORS</code>
@@ -166,9 +139,8 @@
which means a bold red foreground text on the terminal’s default
background.
</p>
</dd>
-<dt><code>GREP_COLORS</code></dt>
-<dd><a name="index-GREP_005fCOLORS-environment-variable"></a>
-<a name="index-highlight-markers-1"></a>
+<dt
id='index-GREP_005fCOLORS-environment-variable'><span><code>GREP_COLORS</code><a
href='#index-GREP_005fCOLORS-environment-variable' class='copiable-anchor'>
¶</a></span></dt>
+<dd><span id="index-highlight-markers-1"></span>
<p>This variable specifies the colors and other attributes
used to highlight various parts of the output.
Its value is a colon-separated list of <code>terminfo</code> capabilities
@@ -177,9 +149,8 @@
Supported capabilities are as follows.
</p>
<dl compact="compact">
-<dt><code>sl=</code></dt>
-<dd><a name="index-sl-GREP_005fCOLORS-capability"></a>
-<p>SGR substring for whole selected lines
+<dt id='index-sl-GREP_005fCOLORS-capability'><span><code>sl=</code><a
href='#index-sl-GREP_005fCOLORS-capability' class='copiable-anchor'>
¶</a></span></dt>
+<dd><p>SGR substring for whole selected lines
(i.e.,
matching lines when the <samp>-v</samp> command-line option is omitted,
or non-matching lines when <samp>-v</samp> is specified).
@@ -189,9 +160,8 @@
The default is empty (i.e., the terminal’s default color pair).
</p>
</dd>
-<dt><code>cx=</code></dt>
-<dd><a name="index-cx-GREP_005fCOLORS-capability"></a>
-<p>SGR substring for whole context lines
+<dt id='index-cx-GREP_005fCOLORS-capability'><span><code>cx=</code><a
href='#index-cx-GREP_005fCOLORS-capability' class='copiable-anchor'>
¶</a></span></dt>
+<dd><p>SGR substring for whole context lines
(i.e.,
non-matching lines when the <samp>-v</samp> command-line option is omitted,
or matching lines when <samp>-v</samp> is specified).
@@ -201,17 +171,15 @@
The default is empty (i.e., the terminal’s default color pair).
</p>
</dd>
-<dt><code>rv</code></dt>
-<dd><a name="index-rv-GREP_005fCOLORS-capability"></a>
-<p>Boolean value that reverses (swaps) the meanings of
+<dt id='index-rv-GREP_005fCOLORS-capability'><span><code>rv</code><a
href='#index-rv-GREP_005fCOLORS-capability' class='copiable-anchor'>
¶</a></span></dt>
+<dd><p>Boolean value that reverses (swaps) the meanings of
the ‘<samp>sl=</samp>’ and ‘<samp>cx=</samp>’
capabilities
when the <samp>-v</samp> command-line option is specified.
The default is false (i.e., the capability is omitted).
</p>
</dd>
-<dt><code>mt=01;31</code></dt>
-<dd><a name="index-mt-GREP_005fCOLORS-capability"></a>
-<p>SGR substring for matching non-empty text in any matching line
+<dt id='index-mt-GREP_005fCOLORS-capability'><span><code>mt=01;31</code><a
href='#index-mt-GREP_005fCOLORS-capability' class='copiable-anchor'>
¶</a></span></dt>
+<dd><p>SGR substring for matching non-empty text in any matching line
(i.e.,
a selected line when the <samp>-v</samp> command-line option is omitted,
or a context line when <samp>-v</samp> is specified).
@@ -220,45 +188,39 @@
The default is a bold red text foreground over the current line background.
</p>
</dd>
-<dt><code>ms=01;31</code></dt>
-<dd><a name="index-ms-GREP_005fCOLORS-capability"></a>
-<p>SGR substring for matching non-empty text in a selected line.
+<dt id='index-ms-GREP_005fCOLORS-capability'><span><code>ms=01;31</code><a
href='#index-ms-GREP_005fCOLORS-capability' class='copiable-anchor'>
¶</a></span></dt>
+<dd><p>SGR substring for matching non-empty text in a selected line.
(This is used only when the <samp>-v</samp> command-line option is omitted.)
The effect of the ‘<samp>sl=</samp>’ (or
‘<samp>cx=</samp>’ if ‘<samp>rv</samp>’) capability
remains active when this takes effect.
The default is a bold red text foreground over the current line background.
</p>
</dd>
-<dt><code>mc=01;31</code></dt>
-<dd><a name="index-mc-GREP_005fCOLORS-capability"></a>
-<p>SGR substring for matching non-empty text in a context line.
+<dt id='index-mc-GREP_005fCOLORS-capability'><span><code>mc=01;31</code><a
href='#index-mc-GREP_005fCOLORS-capability' class='copiable-anchor'>
¶</a></span></dt>
+<dd><p>SGR substring for matching non-empty text in a context line.
(This is used only when the <samp>-v</samp> command-line option is specified.)
The effect of the ‘<samp>cx=</samp>’ (or
‘<samp>sl=</samp>’ if ‘<samp>rv</samp>’) capability
remains active when this takes effect.
The default is a bold red text foreground over the current line background.
</p>
</dd>
-<dt><code>fn=35</code></dt>
-<dd><a name="index-fn-GREP_005fCOLORS-capability"></a>
-<p>SGR substring for file names prefixing any content line.
+<dt id='index-fn-GREP_005fCOLORS-capability'><span><code>fn=35</code><a
href='#index-fn-GREP_005fCOLORS-capability' class='copiable-anchor'>
¶</a></span></dt>
+<dd><p>SGR substring for file names prefixing any content line.
The default is a magenta text foreground over the terminal’s default
background.
</p>
</dd>
-<dt><code>ln=32</code></dt>
-<dd><a name="index-ln-GREP_005fCOLORS-capability"></a>
-<p>SGR substring for line numbers prefixing any content line.
+<dt id='index-ln-GREP_005fCOLORS-capability'><span><code>ln=32</code><a
href='#index-ln-GREP_005fCOLORS-capability' class='copiable-anchor'>
¶</a></span></dt>
+<dd><p>SGR substring for line numbers prefixing any content line.
The default is a green text foreground over the terminal’s default
background.
</p>
</dd>
-<dt><code>bn=32</code></dt>
-<dd><a name="index-bn-GREP_005fCOLORS-capability"></a>
-<p>SGR substring for byte offsets prefixing any content line.
+<dt id='index-bn-GREP_005fCOLORS-capability'><span><code>bn=32</code><a
href='#index-bn-GREP_005fCOLORS-capability' class='copiable-anchor'>
¶</a></span></dt>
+<dd><p>SGR substring for byte offsets prefixing any content line.
The default is a green text foreground over the terminal’s default
background.
</p>
</dd>
-<dt><code>se=36</code></dt>
-<dd><a name="index-fn-GREP_005fCOLORS-capability-1"></a>
-<p>SGR substring for separators that are inserted
+<dt id='index-fn-GREP_005fCOLORS-capability-1'><span><code>se=36</code><a
href='#index-fn-GREP_005fCOLORS-capability-1' class='copiable-anchor'>
¶</a></span></dt>
+<dd><p>SGR substring for separators that are inserted
between selected line fields (‘<samp>:</samp>’),
between context line fields (‘<samp>-</samp>’),
and between groups of adjacent lines
@@ -266,9 +228,8 @@
The default is a cyan text foreground over the terminal’s default
background.
</p>
</dd>
-<dt><code>ne</code></dt>
-<dd><a name="index-ne-GREP_005fCOLORS-capability"></a>
-<p>Boolean value that prevents clearing to the end of line
+<dt id='index-ne-GREP_005fCOLORS-capability'><span><code>ne</code><a
href='#index-ne-GREP_005fCOLORS-capability' class='copiable-anchor'>
¶</a></span></dt>
+<dd><p>Boolean value that prevents clearing to the end of line
using Erase in Line (EL) to Right (‘<samp>\33[K</samp>’)
each time a colorized item ends.
This is needed on terminals on which EL is not supported.
@@ -286,55 +247,51 @@
</p>
</dd>
-<dt><code>LC_ALL</code></dt>
-<dt><code>LC_COLLATE</code></dt>
-<dt><code>LANG</code></dt>
-<dd><a name="index-LC_005fALL-environment-variable-1"></a>
-<a name="index-LC_005fCOLLATE-environment-variable"></a>
-<a name="index-LANG-environment-variable-1"></a>
-<a name="index-character-type"></a>
-<a name="index-national-language-support"></a>
-<a name="index-NLS"></a>
+<dt id='index-LC_005fALL-environment-variable-1'><span><code>LC_ALL</code><a
href='#index-LC_005fALL-environment-variable-1' class='copiable-anchor'>
¶</a></span></dt>
+<dt><span><code>LC_COLLATE</code></span></dt>
+<dt><span><code>LANG</code></span></dt>
+<dd><span id="index-LC_005fCOLLATE-environment-variable"></span>
+<span id="index-LANG-environment-variable-1"></span>
+<span id="index-character-type"></span>
+<span id="index-national-language-support"></span>
+<span id="index-NLS"></span>
<p>These variables specify the locale for the <code>LC_COLLATE</code> category,
which might affect how range expressions like ‘<samp>[a-z]</samp>’
are
interpreted.
</p>
</dd>
-<dt><code>LC_ALL</code></dt>
-<dt><code>LC_CTYPE</code></dt>
-<dt><code>LANG</code></dt>
-<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>
+<dt id='index-LC_005fALL-environment-variable-2'><span><code>LC_ALL</code><a
href='#index-LC_005fALL-environment-variable-2' class='copiable-anchor'>
¶</a></span></dt>
+<dt><span><code>LC_CTYPE</code></span></dt>
+<dt><span><code>LANG</code></span></dt>
+<dd><span id="index-LC_005fCTYPE-environment-variable"></span>
+<span id="index-LANG-environment-variable-2"></span>
+<span id="index-encoding-error"></span>
+<span id="index-null-character"></span>
<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.
This category also determines the character encoding.
-See <a href="Character-Encoding.html#Character-Encoding">Character
Encoding</a>.
+See <a href="Character-Encoding.html">Character Encoding</a>.
</p>
</dd>
-<dt><code>LANGUAGE</code></dt>
-<dt><code>LC_ALL</code></dt>
-<dt><code>LC_MESSAGES</code></dt>
-<dt><code>LANG</code></dt>
-<dd><a name="index-LANGUAGE-environment-variable-1"></a>
-<a name="index-LC_005fALL-environment-variable-3"></a>
-<a name="index-LC_005fMESSAGES-environment-variable-1"></a>
-<a name="index-LANG-environment-variable-3"></a>
-<a name="index-language-of-messages"></a>
-<a name="index-message-language"></a>
-<a name="index-national-language-support-1"></a>
-<a name="index-translation-of-message-language"></a>
+<dt id='index-LANGUAGE-environment-variable-1'><span><code>LANGUAGE</code><a
href='#index-LANGUAGE-environment-variable-1' class='copiable-anchor'>
¶</a></span></dt>
+<dt><span><code>LC_ALL</code></span></dt>
+<dt><span><code>LC_MESSAGES</code></span></dt>
+<dt><span><code>LANG</code></span></dt>
+<dd><span id="index-LC_005fALL-environment-variable-3"></span>
+<span id="index-LC_005fMESSAGES-environment-variable-1"></span>
+<span id="index-LANG-environment-variable-3"></span>
+<span id="index-language-of-messages"></span>
+<span id="index-message-language"></span>
+<span id="index-national-language-support-1"></span>
+<span id="index-translation-of-message-language"></span>
<p>These variables specify the locale for the <code>LC_MESSAGES</code>
category,
which determines the language that <code>grep</code> uses for messages.
The default ‘<samp>C</samp>’ locale uses American English messages.
</p>
</dd>
-<dt><code>POSIXLY_CORRECT</code></dt>
-<dd><a name="index-POSIXLY_005fCORRECT-environment-variable"></a>
-<p>If set, <code>grep</code> behaves as POSIX requires; otherwise,
+<dt
id='index-POSIXLY_005fCORRECT-environment-variable'><span><code>POSIXLY_CORRECT</code><a
href='#index-POSIXLY_005fCORRECT-environment-variable'
class='copiable-anchor'> ¶</a></span></dt>
+<dd><p>If set, <code>grep</code> behaves as POSIX requires; otherwise,
<code>grep</code> behaves more like other GNU programs.
POSIX
requires that options that
@@ -346,9 +303,8 @@
invalid bracket expression. See <a
href="Character-Classes-and-Bracket-Expressions.html#invalid_002dbracket_002dexpr">invalid-bracket-expr</a>.
</p>
</dd>
-<dt><code>_<var>N</var>_GNU_nonoption_argv_flags_</code></dt>
-<dd><a
name="index-_005fN_005fGNU_005fnonoption_005fargv_005fflags_005f-environment-variable"></a>
-<p>(Here <code><var>N</var></code> is <code>grep</code>’s numeric
process ID.)
+<dt
id='index-_005fN_005fGNU_005fnonoption_005fargv_005fflags_005f-environment-variable'><span><code>_<var>N</var>_GNU_nonoption_argv_flags_</code><a
href='#index-_005fN_005fGNU_005fnonoption_005fargv_005fflags_005f-environment-variable'
class='copiable-anchor'> ¶</a></span></dt>
+<dd><p>(Here <code><var>N</var></code> is <code>grep</code>’s numeric
process ID.)
If the <var>i</var>th character of this environment variable’s value is
‘<samp>1</samp>’,
do not consider the <var>i</var>th operand of <code>grep</code> to be an
option,
even if it appears to be one.
@@ -361,11 +317,26 @@
</dd>
</dl>
+<p>The <code>GREP_OPTIONS</code> environment variable of <code>grep</code>
2.20 and
+earlier is no longer supported, as it caused problems when writing
+portable scripts. To make arbitrary changes to how <code>grep</code>
+works, you can use an alias or script instead. For example, if
+<code>grep</code> is in the directory ‘<samp>/usr/bin</samp>’ you
can prepend
+<samp>$HOME/bin</samp> to your <code>PATH</code> and create an executable
script
+<samp>$HOME/bin/grep</samp> containing the following:
+</p>
+<div class="example">
+<pre class="example">#! /bin/sh
+export PATH=/usr/bin
+exec grep --color=auto --devices=skip "$@"
+</pre></div>
+
+</div>
<hr>
<div class="header">
<p>
-Next: <a href="Exit-Status.html#Exit-Status" accesskey="n" rel="next">Exit
Status</a>, Previous: <a
href="Command_002dline-Options.html#Command_002dline-Options" accesskey="p"
rel="prev">Command-line Options</a>, Up: <a href="Invoking.html#Invoking"
accesskey="u" rel="up">Invoking</a> [<a href="index.html#SEC_Contents"
title="Table of contents" rel="contents">Contents</a>][<a
href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
+Next: <a href="Exit-Status.html">Exit Status</a>, Previous: <a
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