Date: Wed, 19 Apr 2006 10:06:27 -0700 From: Brooks Davis <brooks@one-eyed-alien.net> To: Peter Jeremy <peterjeremy@optushome.com.au> Cc: freebsd-hackers@freebsd.org, cokane@cokane.org Subject: Re: [PATCH] Fancy rc startup style RFC Message-ID: <20060419170627.GA11251@odin.ac.hmc.edu> In-Reply-To: <20060419075721.GB704@turion.vk2pj.dyndns.org> References: <444515C8.3030406@centtech.com> <20060418165709.GA17705@central.0xfce3.net> <44452532.40703@centtech.com> <20060418.114933.69380798.imp@bsdimp.com> <346a80220604181102v3597a1edp3e05fa663b87e15c@mail.gmail.com> <20060418193018.GB694@turion.vk2pj.dyndns.org> <444545D3.5010405@centtech.com> <20060419075721.GB704@turion.vk2pj.dyndns.org>
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On Wed, Apr 19, 2006 at 05:57:21PM +1000, Peter Jeremy wrote:
> On Tue, 2006-Apr-18 15:02:27 -0500, Eric Anderson wrote:
> >Peter Jeremy wrote:
> >>>+ padding=3D""
> >>>+ paddingsize=3D$(($columns - 15 - $2 - $namesize))
> >>>+ until [ 0 =3D ${paddingsize} ]; do
> >>>+ padding=3D" $padding"
> >>>+ paddingsize=3D$(($paddingsize - 1))
> >>>+ done
> >>
> >>This particular block of code appears unnecessary (since $padding is=20
> >>unused).
> >
> >I must be missing something, because I'm pretty sure it's used.. What=20
> >did I miss?
>=20
> Actually, I had a closer look and I was wrong, sorry. I missed the
> '[ $2 =3D 0 ]' test. The code might be more legible (and is definitely
> more efficient) if the above code was moved into the else clause for
> that test.
>=20
> Also '[ $2 =3D 0 ]' should probably be written as '[ "0$2" -eq 0 ]', or
> similar, so that it doesn't blow up if there is no $2.
Or better use "${2:-0}" if that's what you mean. The idiom of
prepending stuff to a variable in a string to deal with the unassigned
variables has always seemed to me like it was a hold over from some
truly ancent shell without modern features. The '[ "x$var" =3D "x" ]'
idiom is even worse. Test has only had -z and -n for a decade or two...
-- Brooks
--=20
Any statement of the form "X is the one, true Y" is FALSE.
PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4
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