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posix change for undoing redirections after failed exec; change readline to set lines and columns after SIGTSTP/SIGCONT

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Chet Ramey
2025-01-28 10:15:16 -05:00
parent 25e213a551
commit 0390b4354a
15 changed files with 307 additions and 71 deletions
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doc/bashref.html
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@@ -2990,11 +2990,9 @@ array in turn, and the expansion is the resultant list.
<dt><code class="code">${<var class="var">parameter</var>//<var class="var">pattern</var>/<var class="var">string</var>}</code></dt>
<dt><code class="code">${<var class="var">parameter</var>/#<var class="var">pattern</var>/<var class="var">string</var>}</code></dt>
<dt><code class="code">${<var class="var">parameter</var>/%<var class="var">pattern</var>/<var class="var">string</var>}</code></dt>
<dd><p>The <var class="var">pattern</var> is expanded to produce a pattern just as in
filename expansion and matched
against the expanded value of <var class="var">parameter</var>
according to the rules
described below (see <a class="pxref" href="#Pattern-Matching">Pattern Matching</a>).
<dd><p>The <var class="var">pattern</var> is expanded to produce a pattern
and matched against the expanded value of <var class="var">parameter</var>
as described below (see <a class="pxref" href="#Pattern-Matching">Pattern Matching</a>).
The longest match of <var class="var">pattern</var>
in the expanded value is replaced with <var class="var">string</var>.
<var class="var">string</var> undergoes tilde expansion, parameter and variable expansion,
@@ -3098,18 +3096,28 @@ array in turn, and the expansion is the resultant list.
<dt><code class="code">${<var class="var">parameter</var>,<var class="var">pattern</var>}</code></dt>
<dt><code class="code">${<var class="var">parameter</var>,,<var class="var">pattern</var>}</code></dt>
<dd><p>This expansion modifies the case of alphabetic characters in <var class="var">parameter</var>.
The <var class="var">pattern</var> is expanded to produce a pattern just as in
filename expansion.
Each character in the expanded value of <var class="var">parameter</var> is tested against
<var class="var">pattern</var>, and, if it matches the pattern, its case is converted.
First, the <var class="var">pattern</var> is expanded to produce a pattern
as described below in <a class="ref" href="#Pattern-Matching">Pattern Matching</a>.
</p>
<p><code class="code">Bash</code>
then examines characters in the expanded value of <var class="var">parameter</var>
against <var class="var">pattern</var> as described below.
If a character matches the pattern, its case is converted.
The pattern should not attempt to match more than one character.
</p>
<p>The &lsquo;<samp class="samp">^</samp>&rsquo; operator converts lowercase letters matching <var class="var">pattern</var>
to uppercase; the &lsquo;<samp class="samp">,</samp>&rsquo; operator converts matching uppercase letters
to lowercase.
The &lsquo;<samp class="samp">^^</samp>&rsquo; and &lsquo;<samp class="samp">,,</samp>&rsquo; expansions convert each matched character in the
expanded value; the &lsquo;<samp class="samp">^</samp>&rsquo; and &lsquo;<samp class="samp">,</samp>&rsquo; expansions match and convert only
the first character in the expanded value.
<p>Using
&lsquo;<samp class="samp">^</samp>&rsquo;
converts lowercase letters matching <var class="var">pattern</var> to uppercase;
&lsquo;<samp class="samp">,</samp>&rsquo;
converts matching uppercase letters to lowercase.
The
&lsquo;<samp class="samp">^</samp>&rsquo; and &lsquo;<samp class="samp">,</samp>&rsquo; variants
examine the first character in the expanded value
and convert its case if it matches <var class="var">pattern</var>;
the
&lsquo;<samp class="samp">^^</samp>&rsquo; and &lsquo;<samp class="samp">,,</samp>&rsquo; variants
examine all characters in the expanded value
and convert each one that matches <var class="var">pattern</var>.
If <var class="var">pattern</var> is omitted, it is treated like a &lsquo;<samp class="samp">?</samp>&rsquo;, which matches
every character.
</p>
@@ -7466,6 +7474,8 @@ as &lsquo;<samp class="samp">on</samp>&rsquo; by &lsquo;<samp class="samp">shopt
If this variable is in the environment when Bash
starts up, the shell enables each option in the list before
reading any startup files.
If this variable is exported, child shells will enable each option
in the list.
This variable is readonly.
</p>
</dd>
@@ -14603,6 +14613,8 @@ It may be omitted if the word designator begins with a &lsquo;<samp class="samp"
&lsquo;<samp class="samp">*</samp>&rsquo;, &lsquo;<samp class="samp">-</samp>&rsquo;, or &lsquo;<samp class="samp">%</samp>&rsquo;.
Words are numbered from the beginning of the line,
with the first word being denoted by 0 (zero).
That first word is usually the command word, and the arguments begin
with the second word.
Words are inserted into the current line separated by single spaces.
</p>
<p>For example,
@@ -14614,7 +14626,7 @@ When you type this, the preceding command is repeated in toto.
</p>
</dd>
<dt><code class="code">!!:$</code></dt>
<dd><p>designates the last argument of the preceding command.
<dd><p>designates the last word of the preceding command.
This may be shortened to <code class="code">!$</code>.
</p>
</dd>