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Re: bash bug in $()

From: Paul Eggert
Subject: Re: bash bug in $()
Date: Thu, 29 Dec 2005 13:29:44 -0800
User-agent: Gnus/5.1007 (Gnus v5.10.7) Emacs/21.4 (gnu/linux)

Thanks for reporting that.  I installed this patch.

2005-12-29  Paul Eggert  <address@hidden>

        * doc/autoconf.texi (Shell Substitutions): Warn about unbalanced
        parentheses in $(...).  Problem reported by Eric Blake.

--- doc/autoconf.texi   12 Dec 2005 18:46:51 -0000      1.936
+++ doc/autoconf.texi   29 Dec 2005 21:28:30 -0000      1.937
@@ -10511,6 +10511,15 @@ a different notation @samp{$((@var{expre
 shells is an arithmetic expression not a command.  To avoid the
 confusion, insert a space between the two opening parentheses.
+Avoid @var{commands} that contain unbalanced parentheses in
+here-documents, comments, or case statement patterns, as many shells
+mishandle them.  For example, Bash 3.1, @samp{ksh88}, @command{pdksh}
+5.2.14, and Zsh 4.2.6 all mishandle the following valid command:
+echo $(case x in x) echo hello;; esac)
address@hidden example
 @end table

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