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Date:      Wed, 6 Oct 2010 15:12:34 -0700
From:      Garrett Cooper <gcooper@FreeBSD.org>
To:        Devin Teske <dteske@vicor.com>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: sysconf -- a sysctl(8)-like utility for managing /etc/rc.conf et. al.
Message-ID:  <AANLkTikHW_9WKiZHH=Ci=m7qm9OgJ5DpS=d7Aa6NY51g@mail.gmail.com>
In-Reply-To: <1286397912.27308.40.camel@localhost.localdomain>
References:  <1286397912.27308.40.camel@localhost.localdomain>

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On Wed, Oct 6, 2010 at 1:45 PM, Devin Teske <dteske@vicor.com> wrote:
> Hello fellow freebsd-hackers,
>
> Long-time hacker, first-time poster.
>
> I'd like to share a shell script that I wrote for FreeBSD system
> administration.
>
> The attached shell script works similar to sysctl(8), but rather than
> querying or working on sysctl MIBs, it instead works on the /etc/rc.conf
> (and /etc/rc.conf.local) files.
>
> Syntax shown below (available by running the script without arguments):
>
> Usage: sysconf [OPTIONS] name[=3Dvalue] ...
> OPTIONS:
> =A0 =A0 =A0 =A0-h --help =A0 Print this message to stderr and exit.
> =A0 =A0 =A0 =A0-d =A0 =A0 =A0 =A0 =A0Print list of internal dependencies =
before exit.
> =A0 =A0 =A0 =A0-e =A0 =A0 =A0 =A0 =A0Print query results as `var=3Dvalue'=
 (useful for producing
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0output to be fed back in). Ignored=
 if -n is specified.
> =A0 =A0 =A0 =A0-n =A0 =A0 =A0 =A0 =A0Show only variable values, not their=
 names.
>
> ENVIRONMENT:
> =A0 =A0 =A0 =A0SYSCONF_SHOW_DEPS =A0 =A0 Dump list of dependencies. Must =
be zero or one
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0(default: `0')
> =A0 =A0 =A0 =A0RC_DEFAULTS =A0 =A0 =A0 =A0 =A0 Location of `/etc/defaults=
/rc.conf' file.
>
> Examples:
>
> root@mymachine ~ $ sysconf hostname
> hostname: mymachine.localdomain
> root@mymachine ~ $ sysconf hostname=3Dfoomaster.deluxe.com
> hostname: mymachine.localdomain -> foomaster.deluex.com
> root@mymachine ~ $ sysconf -e hostname
> hostname=3D"foomaster.deluxe.com"
> root@mymachine ~ $ sysconf -n hostname
> foomaster.deluxe.com
>
> The script has zero external dependencies. None. Period. It will use
> grep(1) if installed, but it is not required.
>
> Tested extensively on FreeBSD-4.8, FreeBSD-4.11, FreeBSD-8.0, and
> FreeBSD-8.1.

    I haven't looked at this yet, but this will result in user
confusion as it differs in purpose from sysconf(3) (which is a POSIX
API that helps determine system configuration tunable variables)...
Thanks,
-Garrett



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