Date: Sun, 6 Aug 2017 15:31:30 +0200 From: Polytropon <freebsd@edvax.de> To: Manish Jain <bourne.identity@hotmail.com> Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Re: Is quoting necessary in /etc/rc.conf ? Message-ID: <20170806153130.1dbcefd0.freebsd@edvax.de> In-Reply-To: <VI1PR02MB120082575A858DA8685A40A0F6B40@VI1PR02MB1200.eurprd02.prod.outlook.com> References: <VI1PR02MB120082575A858DA8685A40A0F6B40@VI1PR02MB1200.eurprd02.prod.outlook.com>
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On Sun, 6 Aug 2017 11:00:03 +0000, Manish Jain wrote:
> On my system, it works whether I put either of the following in rc.conf:
>
> xyz_enable="YES"
>
> Or,
>
> xyz_enable=YES
>
> Just wished to check whether an unquoted YES is completely equivalent
> (and accepted) as a quoted YES ?
Keep in mind /etc/rc.conf is basically a sh script. So the
quoting rules of sh apply, and especially for the values YES
and NO, it's completely equivalent.
The general form is NAME=VALUE, and if VALUE contains spaces,
quoting is needed, except you escape spaces. So
foo_enable=YES
is totally valid (no spaces), while both
foo_flags="bar baz"
and
foo_flags=bar\ baz
is valid as well (with spaces).
If VALUE contains the $ sign or other special characters that
might cause interpretation by /bin/sh at "parsing time", using
the single quotes is possible:
foo_currency='US$'
For empty values, using
foo_flags=""
instead of
foo_flags=
looks "more logical", as "the empty value" can clearly be seen,
instead of just missing the right-hand side of the association.
In order to avoid confusion, using quotes for all arguments is
suggested as per /etc/defaults/rc.conf ("system standard"), and
this consistent form - even for the values that don't _require_
quotes, provides a clean view of that configuration file.
That said, sticking with the "system standard" is never wrong. :-)
--
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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