Date: Sat, 9 Jan 1999 22:13:56 -0500 (EST) From: Alan Bawden <Alan@LCS.MIT.EDU> To: freebsd-questions@FreeBSD.ORG Subject: Re: messing with /etc/rc.conf Message-ID: <9Jan1999.220116.Alan@LCS.MIT.EDU> In-Reply-To: <19990108192746.B63511@scientia.demon.co.uk> (message from Ben Smithurst on Fri, 8 Jan 1999 19:27:46 %2B0000) References: <8Jan1999.042549.Alan@LCS.MIT.EDU> <19990108192746.B63511@scientia.demon.co.uk>
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Date: Fri, 8 Jan 1999 19:27:46 +0000
From: Ben Smithurst <ben@scientia.demon.co.uk>
Alan Bawden wrote:
> ... I recently learned
> that if rc.conf contains the following:
>
> ntpdate_flags="-bs $(awk '$1 == "server" || $1 == "peer" {print $2}' /etc/ntp.conf)"
>
> something will occasionally re-write this to read:
>
> ntpdate_flags="-bs $(awk '$1 == "
Well obviously, since the first non-escaped quote will terminate the
quoted string.
Forgive me, but it isn't obvious to me. That second doublequote is
-inside- a $( ) pair, and so does -not- terminate the string if `sh' is
doing the parsing.
Escape the quotes by preceding them with a backslash within the quoted
string and it might work:
That, in fact, would make it illegal sh syntax.
> 1. What is it that makes this change. And what exactly are the rules it
> applies when parsing/rewriting the file?
The file is parsed by sh(1), read it's man page for quoting rules.
I did. The file is perfectly legal sh syntax.
I was wondering what -other- program it is that parses /etc/rc.conf, and if
there was some way I could write something that makes -both- sh, and that
other mystery program happy at the same time.
> 2. If I move the setting of ntpdate_flags into /etc/rc.conf.local, will
> whatever this thing is leave it alone there?
No, it's still parsed by sh(1).
The line I wrote is perfectly legal sh syntax. So if /etc/rc.conf.local is
-only- parsed by sh, then that will solve my problem.
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