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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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This commit is contained in:
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/bash.1
+17 -8
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@@ -5,7 +5,7 @@
.\" Case Western Reserve University
.\" chet.ramey@case.edu
.\"
.\" Last Change: Wed Jan 14 15:46:08 EST 2026
.\" Last Change: Tue Mar 3 10:52:34 EST 2026
.\"
.\" For bash_builtins, strip all but "SHELL BUILTIN COMMANDS" section
.\" For rbash, strip all but "RESTRICTED SHELL" section
@@ -22,7 +22,7 @@
.ds zX \" empty
.if \n(zZ=1 .ig zZ
.if \n(zY=1 .ig zY
.TH BASH 1 "2026 January 14" "GNU Bash 5.3"
.TH BASH 1 "2026 March 3" "GNU Bash 5.3"
.\"
.ie \n(.g \{\
.ds ' \(aq
@@ -3725,8 +3725,9 @@ introduce indirection.
In each of the cases below, \fIword\fP is subject to tilde expansion,
parameter expansion, command substitution, and arithmetic expansion.
.PP
When not performing substring expansion, using the forms documented below
(e.g., \fB:-\fP),
When performing the first four expansions documented below
(\fB:-\fP, \fB:=\fP, \fB:?\fP, and \fB:+\fP),
including the colon,
\fBbash\fP tests for a parameter that is unset or null.
Omitting the colon tests only for a parameter that is unset.
.PP
@@ -3734,7 +3735,9 @@ Omitting the colon tests only for a parameter that is unset.
${\fIparameter\fP\fB:\-\fP\fIword\fP}
\fBUse Default Values\fP. If
.I parameter
is unset or null, the expansion of
is unset or null,
or unset if the colon is not present,
the expansion of
.I word
is substituted.
Otherwise, the value of
@@ -3745,7 +3748,9 @@ ${\fIparameter\fP\fB:=\fP\fIword\fP}
\fBAssign Default Values\fP.
If
.I parameter
is unset or null, the expansion of
is unset or null,
or unset if the colon is not present,
the expansion of
.I word
is assigned to
.IR parameter ,
@@ -3758,7 +3763,9 @@ ${\fIparameter\fP\fB:?\fP\fIword\fP}
\fBDisplay Error if Null or Unset\fP.
If
.I 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 \fIword\fP (or a message to that effect
if
.I word
@@ -3772,7 +3779,9 @@ ${\fIparameter\fP\fB:+\fP\fIword\fP}
\fBUse Alternate Value\fP.
If
.I 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
.I word
is substituted.
The value of \fIparameter\fP is not used.