Date: Fri, 13 Mar 2009 03:25:05 -0700 (PDT) From: GESBBB <gesbbb@yahoo.com> To: freebsd-ports@freebsd.org Subject: Re: Problem with Bash-4 and $(command) syntax Message-ID: <277910.98378.qm@web32103.mail.mud.yahoo.com> In-Reply-To: <721111.30542.qm@web39104.mail.mud.yahoo.com> References: <721111.30542.qm@web39104.mail.mud.yahoo.com>
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> From: bf bf2006a@yahoo.com=0A=0A[snip]=0A=0A> The problem is that the por= t's parser is =0A> broken, owing in part to incompatibilities between the = =0A> system yacc currently used to build the parser and GNU=0A> bison, whic= h is used by the people who write bash.=A0 This=0A> is true of both shells/= bash and shells/bash3, but is more=0A> noticeable in shells/bash.=A0 A fix = has been proposed, and patches=0A> are available, in the follow-up to:=0A> = =0A> http://www.FreeBSD.org/cgi/query-pr.cgi?pr=3Dports/101230=0A>; =0A> The= port's maintainer has been reluctant to switch to bison,=0A> so this may n= ot be the solution that is ultimately used to=0A> fix the port, but you can= use these in the meantime.=0A=0AI just received a reply back from the 'bas= h-bugs' forum.=0A=0A<quote>=0A=0AChet Ramey <chet.ramey@case.edu>=0A=0ABash= -4.0 parses the contents of command substitutions before=0Aexecuting them.= =A0 This is what Posix requires.=A0 Previous versions=0Adeferred parsing to= the subshell spawned to execute the command.=0A=0A(This part works best if= you're looking at the yacc grammar.)=0A=0ABSD yacc will not reduce a simpl= e_list1 to a simple_list when the=0Alookahead token is `)'.=A0 Bison will.= =A0 It's that simple.=0A=0A</quote>=0A=0A-- =0AJerry=0A
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