Re: [Xen-devel] [PATCH v6] acpi: Prevent GPL-only code from seeping into non-GPL binaries

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Sep 26, 2016 at 08:58:00AM -0400, Boris Ostrovsky wrote:
> On 09/26/2016 06:24 AM, Wei Liu wrote:
> > On Mon, Sep 26, 2016 at 11:20:50AM +0100, Ian Jackson wrote:
> >> Wei Liu writes ("Re: [PATCH v6] acpi: Prevent GPL-only code from seeping 
> >> into non-GPL binaries"):
> >>> On Fri, Sep 23, 2016 at 03:14:20PM -0400, Boris Ostrovsky wrote:
> >>>> +links="ABCD"
> >>>> +
> >>>> +for i in $(seq 0 3)
> >>>> +do
> >>>> +    link=${links:$i:1}
> >>> This is not portable.
> >>>
> >>> Use following instead:
> >>>
> >>> links="A B C D"
> >>>
> >>> set $links
> >>> for link in $@
> >> What's wrong with
> >>
> >>   links="A B C D"
> >>
> >>   for link in $links; do
> >>     ....
> >>
> >> ?
> 
> There are two interdependent variables that I need to print. The C
> equivalent is
> 
>     for ( i = 0; i < 4; i++ )
>         printf("%d %c\n", i, 'A'+i);
> 
> The character value is derived from 'i', which in this example is an
> index into 'links' array.
> 
> I suggested in response to Jan
> 
>     link=`echo "A B C D" | cut -d" " -f $i`
> 

Oh, two variables. Then you could also do:

  link=`echo $i | tr "1234" "ABCD"`

(cut and tr are both from coreutils, so I think we're fine with using
either of them)

Anyway, enough of discussion about shell script. Pick the method you
like. :-)

Wei.


> 
> 
> -boris
> 

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