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Date: Tue, 04 May 2004 09:11:58 +0300
From: Danny Braniss <danny@cs.huji.ac.il>
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cc: freebsd-current@FreeBSD.org
Subject: Re: kenv enhancement 
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> On Saturday 01 May 2004 08:22 am, Danny Braniss wrote:
> > Hi,
> > 	I propose to bring back some lost options to kenv, -c and -s
> > ie,
> > 	kenv -c class [-s]
> > so that
> > 	kenv -h is equivalent to kenv -c hint.
> > and
> > 	kenv -c boot.nfsroot. -s
> > gives:
> > nfshandle="X9ca48b3f5b77454e0c00000002000000bfa3063100000000000000000000000
> >0X" path="/d/6"
> > server="132.65.16.100"
> >
> > the 'enhanced' kenv is in
> > 	ftp://ftp.cs.huji.ac.il/users/danny/freebsd/kenv/
> >
> > danny
> 
> I rototilled this a bit to make it use the existing style.  I also renamed 
> 'class' to prefix since you can do things like 'kenv -p kern -s' to get 
> interesting output like:
> 
> el="kernel"
> el_options=""
> elname="/boot/kernel/kernel"
> 
> :-P
> 
> One thing to note is that 'kenv -p foo' is basically the same as
> 'kenv | grep ^foo', and that 'kenv -p foo -s' is basically the same as
> 'kenv | sed -ne '/^foo/{s///;p;}'.  Generally new options aren't added to 
> programs if they can be easily duplicated via a simple pipeline.  Is there a 
> reason that you need kenv to do this explicitly rather than using sed or 
> grep?

We use it very early in the boot process - rc.d/initdiskless, and
/usr might not be mounted - not true in my particular case though.
BTW, the flags I used are the same that once were in kenv and somewhere
down the road were removed.

danny