Date: Sat, 9 Oct 2010 10:36:46 -0700 From: Devin Teske <dteske@vicor.com> To: Garrett Cooper <gcooper@FreeBSD.org> Cc: Brandon Gooch <jamesbrandongooch@gmail.com>, freebsd-hackers@freebsd.org Subject: Re: sysrc -- a sysctl(8)-like utility for managing /etc/rc.conf et. al. Message-ID: <0206CB74-6E83-4762-B26D-F95E024C90F0@vicor.com> In-Reply-To: <AANLkTim7QcAPSJHt9D-P3XggO5dFgHGGVSzwM=a3Ez5E@mail.gmail.com> References: <1286397912.27308.40.camel@localhost.localdomain> <AANLkTikoohMo5ng-RM3tctTH__P6cqhQpm=FPhSE9mMg@mail.gmail.com> <51B4504F-5AA4-47C5-BF23-FA51DE5BC8C8@vicor.com> <4CAD513F.3010903@DataIX.net> <D5D9B585-96DA-4BD0-899D-A7BFFC0C540C@vicor.com> <4CAD7563.1070706@DataIX.net> <4CAD7CA1.4050202@freebsd.org> <AANLkTim7QcAPSJHt9D-P3XggO5dFgHGGVSzwM=a3Ez5E@mail.gmail.com>
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On Oct 9, 2010, at 10:03 AM, Garrett Cooper wrote:
> On Thu, Oct 7, 2010 at 12:54 AM, Julian Elischer <julian@freebsd.org> =
wrote:
>> On 10/7/10 12:23 AM, jhell wrote:
>>>=20
>>> Alright thank you for your explanation. I do not normally see this =
usage
>>> and this just sort of stood out at me and I did not want to assume =
what
>>> you were trying to accomplish, without asking.
>>=20
>> three useage cases come to mind immediately.
>>=20
>> 1/ use within other scripts..
>> instead of the dozens of homegrown solutions people have written for =
puting
>> something
>> into /etc/rc.conf one can use this.
>>=20
>> 2/ what is the value of X on machines a,b,c
>> foreach machine in a b c
>> do
>> ssh $machine sysrc X
>> done
>>=20
>> you may well say "you could have used grep" bu tgrep doesn't give =
the
>> default value vie the
>> hierachy of .rc files.
>> 2A is of course to correc teh values found to be wrong with (2)
>>=20
>> 3/ on a really small system, without an editor this may do a cleaner =
job
>> than the usual
>> "grep -v X /etc/rc.conf >/tmp/x;echo X >> /tmp/x; mv /tmp/x =
/etc/rc.conf"
>=20
> I was going to say...
>=20
> 3A On a system where you're logged in via singleuser, sometimes
> terminal settings don't work correctly with editors (these days it's
> mostly because /usr isn't available so it can't load ncurses apps,
> some libs, termcap, etc). That would be a lifesaver in this case.
I hadn't realized that. That's stupendous!
Though I do believe that `/rescue/vi' exists these days as a =
statically-linked binary (built using crunchgen(1) via =
`rescue/rescue/Makefile' in the FreeBSD source tree).
> But then I realized that this command probably would live in
> /usr/sbin and would probably need other apps in /usr/bin // /usr/sbin
> to run this command :).
I envisioned it living in `/sbin' and it's actually free of dependencies =
to external executables. If you execute it with the "-d" option ('d' for =
'dependencies'), you can see that it uses only shell internals. The only =
thing this script truly depends on is `/bin/sh'. So it sounds like it =
would fit the ability of working within single-user mode quite well =
(remember, I developed it for embedded systems -- where things like =
grep/sed/awk may even be missing).
> Thanks!
> -Garrett
> _______________________________________________
> freebsd-hackers@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
> To unsubscribe, send any mail to =
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--
Cheers,
Devin Teske
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