On Sat, 2006-11-18 at 06:50 -0800, oldman wrote:
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> Robert P. J. Day wrote:
> > as part of a crash course in teaching some folks scripting this last
> > week, i grabbed a random FC6 script and walked through it with them.
> > i chose /sbin/service since it's a nice example of several scripting
> > features in a single place, but that script does have some strange
> > code in it.
> >
> > first, as an exercise for the reader, what is so amusing about
> > *this* snippet of script:
> >
> >
> > case "${1}" in
> > --help | -h | --h* )
> >
> >
> > also, based on the structure of the main argument processing loop,
> > you can invoke service in some weird ways:
> >
> > $ service httpd --version
> > service ver. 0.91
> >
> > where you can see that the first argument of service name "httpd" is
> > superseded by "--version". is that by design? just curious.
> >
> > rday
> >
> I read here recently that (I believe) bash reads the input line and
> ensures that switches (i.e. --<something> or -*) is associated with the
> command (always the first thing in a command line). I'll assume that it
> also fixes entries with pipes or ; in a similar way.
>
> I think you'll find that most other commands work this way such as "yum
> - -y update --exclude=<something> gtk2 --enablerepo=<whatever>" will work
> no matter what order you put the switches or command arguments.
>
I am pretty sure that I have tried this and the order of arguments make
a difference. Foe example, the --exclude argument must come before the
update argument. That is certainly implied by the output of man yum.
> That same email suggested that the behavior is due to change due to
> posix. I'm not sure what posix has to do with this, but apparently
> eventually you will need to use the command line in the form of <cmd>
> <switches> <arguments>. This is o.k. with me as it is the way I've
> always done it.
>
> Scott
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> =arEd
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--
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If someone had told me I would be Pope one day, I would have studied
harder. -- Pope John Paul I
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Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam@xxxxxxxxxxxxx
