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Chet Ramey
2018-03-19 09:46:55 -04:00
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doc/bashref.html
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@@ -1,11 +1,11 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- This text is a brief description of the features that are present in
the Bash shell (version 4.4, 2 March 2018).
the Bash shell (version 5.0, 15 March 2018).
This is Edition 4.4, last updated 2 March 2018,
This is Edition 5.0, last updated 15 March 2018,
of The GNU Bash Reference Manual,
for Bash, Version 4.4.
for Bash, Version 5.0.
Copyright (C) 1988-2018 Free Software Foundation, Inc.
@@ -284,12 +284,12 @@ Next: <a href="#Introduction" accesskey="n" rel="next">Introduction</a>, Previou
<h1 class="top">Bash Features</h1>
<p>This text is a brief description of the features that are present in
the Bash shell (version 4.4, 2 March 2018).
the Bash shell (version 5.0, 15 March 2018).
The Bash home page is <a href="http://www.gnu.org/software/bash/">http://www.gnu.org/software/bash/</a>.
</p>
<p>This is Edition 4.4, last updated 2 March 2018,
<p>This is Edition 5.0, last updated 15 March 2018,
of <cite>The GNU Bash Reference Manual</cite>,
for <code>Bash</code>, Version 4.4.
for <code>Bash</code>, Version 5.0.
</p>
<p>Bash contains features that appear in other popular shells, and some
features that only appear in Bash. Some of the shells that Bash has
@@ -2716,8 +2716,8 @@ array, and an index of -1 references the last element.
<dt><code>${<var>parameter</var>#<var>word</var>}</code></dt>
<dt><code>${<var>parameter</var>##<var>word</var>}</code></dt>
<dd><p>The <var>word</var>
is expanded to produce a pattern just as in filename
expansion (see <a href="#Filename-Expansion">Filename Expansion</a>). If the pattern matches
is expanded to produce a pattern and matched according to the rules
described below (see <a href="#Pattern-Matching">Pattern Matching</a>). If the pattern matches
the beginning of the expanded value of <var>parameter</var>,
then the result of the expansion is the expanded value of <var>parameter</var>
with the shortest matching pattern (the &lsquo;<samp>#</samp>&rsquo; case) or the
@@ -2733,8 +2733,9 @@ array in turn, and the expansion is the resultant list.
</dd>
<dt><code>${<var>parameter</var>%<var>word</var>}</code></dt>
<dt><code>${<var>parameter</var>%%<var>word</var>}</code></dt>
<dd><p>The <var>word</var> is expanded to produce a pattern just as in
filename expansion.
<dd><p>The <var>word</var>
is expanded to produce a pattern and matched according to the rules
described below (see <a href="#Pattern-Matching">Pattern Matching</a>). If the pattern matches
If the pattern matches a trailing portion of the expanded value of
<var>parameter</var>, then the result of the expansion is the value of
<var>parameter</var> with the shortest matching pattern (the &lsquo;<samp>%</samp>&rsquo; case)
@@ -2754,6 +2755,8 @@ array in turn, and the expansion is the resultant list.
filename expansion.
<var>Parameter</var> is expanded and the longest match of <var>pattern</var>
against its value is replaced with <var>string</var>.
The match is performed according to the rules described below
(see <a href="#Pattern-Matching">Pattern Matching</a>).
If <var>pattern</var> begins with &lsquo;<samp>/</samp>&rsquo;, all matches of <var>pattern</var> are
replaced with <var>string</var>. Normally only the first match is replaced.
If <var>pattern</var> begins with &lsquo;<samp>#</samp>&rsquo;, it must match at the beginning
@@ -3045,10 +3048,13 @@ at the start of a filename or immediately following a slash
must be matched explicitly, unless the shell option <code>dotglob</code> is set.
The filenames &lsquo;<samp>.</samp>&rsquo; and &lsquo;<samp>..</samp>&rsquo; must always be matched explicitly,
even if <code>dotglob</code> is set.
When matching a filename, the slash character must always be
matched explicitly.
In other cases, the &lsquo;<samp>.</samp>&rsquo; character is not treated specially.
</p>
<p>When matching a filename, the slash character must always be
matched explicitly by a slash in the pattern, but in other matching
contexts it can be matched by a special pattern character as described
below (see <a href="#Pattern-Matching">Pattern Matching</a>).
</p>
<p>See the description of <code>shopt</code> in <a href="#The-Shopt-Builtin">The Shopt Builtin</a>,
for a description of the <code>nocaseglob</code>, <code>nullglob</code>,
<code>failglob</code>, and <code>dotglob</code> options.