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change to behavior of '&' in pattern substitution replacement string; fix for blank lines in multiline commands saved in command history

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Chet Ramey
2022-01-18 10:59:53 -05:00
parent 5e6f45d9b1
commit 2a1c81bf63
31 changed files with 1596 additions and 1312 deletions
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doc/bash.1
+21 -12
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@@ -5,12 +5,12 @@
.\" Case Western Reserve University
.\" chet.ramey@case.edu
.\"
.\" Last Change: Sun Dec 26 16:02:07 EST 2021
.\" Last Change: Mon Jan 17 17:27:05 EST 2022
.\"
.\" bash_builtins, strip all but Built-Ins section
.if \n(zZ=1 .ig zZ
.if \n(zY=1 .ig zY
.TH BASH 1 "2021 December 26" "GNU Bash 5.2"
.TH BASH 1 "2022 January 17" "GNU Bash 5.2"
.\"
.\" There's some problem with having a `@'
.\" in a tagged paragraph with the BSD man macros.
@@ -50,8 +50,8 @@ bash \- GNU Bourne-Again SHell
[options]
[command_string | file]
.SH COPYRIGHT
.if n Bash is Copyright (C) 1989-2021 by the Free Software Foundation, Inc.
.if t Bash is Copyright \(co 1989-2021 by the Free Software Foundation, Inc.
.if n Bash is Copyright (C) 1989-2022 by the Free Software Foundation, Inc.
.if t Bash is Copyright \(co 1989-2022 by the Free Software Foundation, Inc.
.SH DESCRIPTION
.B Bash
is an \fBsh\fR-compatible command language interpreter that
@@ -3373,18 +3373,27 @@ matches of \fIpattern\fP are deleted.
If \fIstring\fP is null,
matches of \fIpattern\fP are deleted
and the \fB/\fP following \fIpattern\fP may be omitted.
.sp 1
If the \fBpatsub_replacement\fP shell option is enabled using \fBshopt\fP,
any unquoted instances of \fB&\fP in \fIstring\fP are replaced with the
matching portion of \fIpattern\fP.
Backslash is used to quote \fB&\fP in \fIstring\fP; the backslash is removed
.sp 1
Quoting any part of \fIstring\fP inhibits replacement in the
expansion of the quoted portion, including replacement strings stored
in shell variables.
Backslash will escape \fB&\fP in \fIstring\fP; the backslash is removed
in order to permit a literal \fB&\fP in the replacement string.
Users should take care
if \fIstring\fP is double-quoted to avoid unwanted interactions between
the backslash and double-quoting.
Pattern substitution performs the check for \fB&\fP after expanding
\fIstring\fP; shell programmers should quote backslashes intended to escape
the \fB&\fP and inhibit replacement so they survive any quote removal
performed by the expansion of \fIstring\fP.
Backslash can also be used to escape a backslash; \fB\e\e\fP results in
a literal backslash in the replacement.
Users should take care if \fIstring\fP is double-quoted to avoid
unwanted interactions between the backslash and double-quoting, since
backslash has special meaning within double quotes.
Pattern substitution performs the check for unquoted \fB&\fP after
expanding \fIstring\fP;
shell programmers should quote any occurrences of \fB&\fP
they want to be taken literally in the replacement
and ensure any instances of \fB&\fP they want to be replaced are unquoted.
.sp 1
If the
.B nocasematch
shell option is enabled, the match is performed without regard to the case