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fix to multiple alias expansion problem in command substitutions

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This commit is contained in:
Chet Ramey
2022-02-09 10:15:16 -05:00
parent b325b0e96b
commit 780d665cfd
10 changed files with 266 additions and 182 deletions
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doc/bashref.texi
+8 -1
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@@ -14,7 +14,7 @@ This is Edition @value{EDITION}, last updated @value{UPDATED},
of @cite{The GNU Bash Reference Manual},
for @code{Bash}, Version @value{VERSION}.
Copyright @copyright{} 1988--2021 Free Software Foundation, Inc.
Copyright @copyright{} 1988--2022 Free Software Foundation, Inc.
@quotation
Permission is granted to copy, distribute and/or modify this document
@@ -8115,6 +8115,13 @@ Alias expansion is always enabled, even in non-interactive shells.
Reserved words appearing in a context where reserved words are recognized
do not undergo alias expansion.
@item
Alias expansion is performed when initially parsing a command substitution.
The default mode generally defers it, when enabled, until the command
substitution is executed. This means that command substitution will not
expand aliases that are defined after the command substitution is initially
parsed (e.g., as part of a function definition).
@item
The @sc{posix} @env{PS1} and @env{PS2} expansions of @samp{!} to
the history number and @samp{!!} to @samp{!} are enabled,