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fix for heuristic to detect case statements when parsing $() command substitutions to find history expansion; fix for history not being saved if a SIGHUP arrives during $PROMPT_COMMAND execution; workaround for Cygwin bug that results in bash incorrectly calculating the system pipe size

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Chet Ramey
2026-03-09 14:54:45 -04:00
parent d0b41c2c5f
commit 1f292e433e
16 changed files with 6183 additions and 366 deletions
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doc/bashref.texi
+20 -7
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@@ -2306,8 +2306,10 @@ introduce indirection.
In each of the cases below, @var{word} is subject to tilde expansion,
parameter expansion, command substitution, and arithmetic expansion.
When not performing substring expansion, using the forms described
below (e.g., @samp{:@minus{}}), Bash tests for a parameter that is unset or null.
When performing the first four expansions documented below
(@samp{:-}, @samp{:=}, @samp{:?}, and @samp{:+}),
including the colon,
Bash tests for a parameter that is unset or null.
Omitting the colon results in a test only for a parameter that is unset.
Put another way, if the colon is included,
the operator tests for both @var{parameter}'s existence and that its value
@@ -2316,7 +2318,10 @@ is not null; if the colon is omitted, the operator tests only for existence.
@table @code
@item $@{@var{parameter}:@minus{}@var{word}@}
If @var{parameter} is unset or null, the expansion of
If @var{parameter}
is unset or null,
or unset if the colon is not present,
the expansion of
@var{word} is substituted.
Otherwise, the value of @var{parameter} is substituted.
@@ -2337,7 +2342,10 @@ unset-or-null
@end example
@item $@{@var{parameter}:=@var{word}@}
If @var{parameter} is unset or null, the expansion of @var{word}
If @var{parameter}
is unset or null,
or unset if the colon is not present,
the expansion of @var{word}
is assigned to @var{parameter},
and the result of the expansion
is the final value of @var{parameter}.
@@ -2365,7 +2373,9 @@ DEFAULT
@item $@{@var{parameter}:?@var{word}@}
If @var{parameter}
is null or unset, the shell writes
is unset or null,
or unset if the colon is not present,
the shell writes
the expansion of @var{word} (or a message
to that effect if @var{word}
is not present) to the standard error and, if it
@@ -2392,7 +2402,10 @@ $ echo $@{var:?var is unset or null@}
@item $@{@var{parameter}:+@var{word}@}
If @var{parameter}
is null or unset, nothing is substituted, otherwise the expansion of
is unset or null,
or unset if the colon is not present,
nothing is substituted,
otherwise the expansion of
@var{word} is substituted.
The value of @var{parameter} is not used.
@@ -8569,7 +8582,7 @@ This means you can use @var{x},
where @var{x} is a shell variable name, in an arithmetic expression,
and the shell will evaluate its value as an expression and use the
result.
A shell variable that is null or unset evaluates to 0 when referenced
A shell variable that is unset or null evaluates to 0 when referenced
by name in an expression.
The value of a variable is evaluated as an arithmetic expression