Date: Wed, 21 Aug 2002 09:48:19 +0200 From: Neil Blakey-Milner <nbm@mithrandr.moria.org> To: Luigi Rizzo <rizzo@icir.org> Cc: arch@freebsd.org Subject: Re: ugliness in rc.* scripts Message-ID: <20020821074819.GA58163@mithrandr.moria.org> In-Reply-To: <20020820232538.A53816@iguana.icir.org> References: <20020820232538.A53816@iguana.icir.org>
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On Tue 2002-08-20 (23:25), Luigi Rizzo wrote:
> Hi,
> in various rc.* scripts we have multiple instances of
> constructs like this:
>
> case ${some_config_variable} in
> [Mm][Ii][Xx][Ed]_[Cc][Aa][Ss][Ee]_[Ss][Tt][Rr][Ii][Nn][Gg])
> ....
>
> which is not the most desirable thing in terms of readability.
> This would be easily fixed by moving /usr/bin/tr to /bin/tr (statically
> linked) and doing
>
> tolower() {
> echo `tr A-Z a-z <<_EOF
> $*`
> }
>
> case `tolower ${some_config_variable}` in
> mixed_case_string)
> ...
>
>
> (btw, i am not sure why, in the above example the _EOF delimited
> is not required nor i can find any place to put it without being
> processed as stdin. Perhaps a bug in /bin/sh ?)
>
> Anyways, should we go for this ? I believe our scripts would be
> greatly improved.
I believe the argument for 'case' and those mixed case strings is that
it doesn't spawn a process, whereas "if [ " did at the time. Using
'echo' and 'tr' and two ``'s will spawn four shells (or something like
that).
Neil
--
Neil Blakey-Milner
nbm@mithrandr.moria.org
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