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commit bash-20180720 snapshot

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Chet Ramey
2018-07-24 09:17:33 -04:00
parent 96efdbb5b4
commit 8d125d8b5f
45 changed files with 6793 additions and 5492 deletions
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doc/bashref.html
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@@ -1452,7 +1452,8 @@ to be matched as a string.
<p>An additional binary operator, &lsquo;<samp>=~</samp>&rsquo;, is available, with the same
precedence as &lsquo;<samp>==</samp>&rsquo; and &lsquo;<samp>!=</samp>&rsquo;.
When it is used, the string to the right of the operator is considered
an extended regular expression and matched accordingly (as in <i>regex</i>3)).
a <small>POSIX</small> extended regular expression and matched accordingly
(as in <i>regex</i>3)).
The return value is 0 if the string matches
the pattern, and 1 otherwise.
If the regular expression is syntactically incorrect, the conditional
@@ -2499,11 +2500,11 @@ interpreted as part of its name.
</p>
<p>If the first character of <var>parameter</var> is an exclamation point (!),
and <var>parameter</var> is not a <var>nameref</var>,
it introduces a level of variable indirection.
Bash uses the value of the variable formed from the rest of
<var>parameter</var> as the name of the variable; this variable is then
expanded and that value is used in the rest of the substitution, rather
than the value of <var>parameter</var> itself.
it introduces a level of indirection.
Bash uses the value formed by expanding the rest of
<var>parameter</var> as the new <var>parameter</var>; this is then
expanded and that value is used in the rest of the expansion, rather
than the expansion of the original <var>parameter</var>.
This is known as <code>indirect expansion</code>.
The value is subject to tilde expansion,
parameter expansion, command substitution, and arithmetic expansion.
@@ -6593,7 +6594,8 @@ The shell sets <code>BASH_ARGC</code> only when in extended debugging mode
(see <a href="#The-Shopt-Builtin">The Shopt Builtin</a>
for a description of the <code>extdebug</code> option to the <code>shopt</code>
builtin).
Setting <code>extdebug</code> after the shell has started to execute a script
Setting <code>extdebug</code> after the shell has started to execute a script,
or referencing this variable when <code>extdebug</code> is not set,
may result in inconsistent values.
</p>
</dd>
@@ -6609,7 +6611,8 @@ The shell sets <code>BASH_ARGV</code> only when in extended debugging mode
(see <a href="#The-Shopt-Builtin">The Shopt Builtin</a>
for a description of the <code>extdebug</code> option to the <code>shopt</code>
builtin).
Setting <code>extdebug</code> after the shell has started to execute a script
Setting <code>extdebug</code> after the shell has started to execute a script,
or referencing this variable when <code>extdebug</code> is not set,
may result in inconsistent values.
</p>
</dd>
@@ -12659,8 +12662,8 @@ fix errors in previous commands quickly.
</p>
<p>History expansion is performed immediately after a complete line
is read, before the shell breaks it into words, and is performed
on each line individually without taking quoting on previous lines into
account.
on each line individually. Bash attempts to inform the history
expansion functions about quoting still in effect from previous lines.
</p>
<p>History expansion takes place in two parts. The first is to determine
which line from the history list should be used during substitution.
@@ -12673,8 +12676,18 @@ that Bash does, so that several words
surrounded by quotes are considered one word.
History expansions are introduced by the appearance of the
history expansion character, which is &lsquo;<samp>!</samp>&rsquo; by default.
Only &lsquo;<samp>\</samp>&rsquo; and &lsquo;<samp>'</samp>&rsquo; may be used to escape the history expansion
character, but the history expansion character is
</p>
<p>History expansion implements shell-like quoting conventions:
a backslash can be used to remove the special handling for the next character;
single quotes enclose verbatim sequences of characters, and can be used to
inhibit history expansion;
and characters enclosed within double quotes may be subject to history
expansion, since backslash can escape the history expansion character,
but single quotes may not, since they are not treated specially within
double quotes.
</p>
<p>When using the shell, only &lsquo;<samp>\</samp>&rsquo; and &lsquo;<samp>'</samp>&rsquo; may be used to escape the
history expansion character, but the history expansion character is
also treated as quoted if it immediately precedes the closing double quote
in a double-quoted string.
</p>