How to do array operation in busybox

[Pratik Prajapati]

Thanks

On Fri, Jun 26, 2015 at 5:08 PM, walter harms <wharms at bfs.de> wrote:

>
>
> Am 26.06.2015 13:15, schrieb Pratik Prajapati:
> > I tried your solution but couldn't print that array:
> >
> > for index in 1 2 3 ; do
> >       eval echo \$LST$index
> > done
> >
> >
>
> yes, because it builds a string and it has no need for eval
>
> LST=""
> for index in 1 2 3
>  do
>    LST=$LST" "$index
>  done
>
> echo "LST= " $LST
>
> should result in:
>
> LST= 1 2 3
>
> the next trick is to use
> set -- $LST
> now you can access via $1 $2 $3 ...
>
> if that is a good idea depend on the program itself.
>
> re,
>   wh
>
> >
> > On Fri, Jun 26, 2015 at 3:27 PM, walter harms <wharms at bfs.de> wrote:
> >
> >>  [image: Boxbe] <https://www.boxbe.com/overview> wharms at bfs.de is not
> on your
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> >
> >>
> >>
> >>
> >> Am 26.06.2015 11:07, schrieb Pratik Prajapati:
> >>> Thanks. Your solution is very useful.
> >>>
> >>
> >> a more shell like solution is simple using a $IFS separated list
> >> and the power of set but if you have sparse values and you need the gaps
> >> you are better of with this solution.
> >>
> >> For the example you could do something like:
> >> LST=""
> >> for NAME in ARG
> >> do
> >>         LST=$LST" "$NAME
> >> done
> >>
> >> just my 2 cents,
> >> re,
> >>  wh
> >>
> >>
> >>> On Fri, Jun 26, 2015 at 12:01 PM, Sven-Göran Bergh <
> >>> sgb-list+busybox at systemaxion.se> wrote:
> >>>
> >>>> On 06/26/2015 07:59 AM, Pratik Prajapati wrote:
> >>>>
> >>>>> I tried one method and was unable to correct it. Can you give me the
> >>>>> correct method ?
> >>>>>
> >>>>> On Fri, Jun 26, 2015 at 11:25 AM, Sven-Göran Bergh
> >>>>> <sgb-list+busybox at systemaxion.se
> >>>>> <mailto:sgb-list+busybox at systemaxion.se>> wrote:
> >>>>>
> >>>>>     Hi Patrik
> >>>>>
> >>>>>     On 06/26/2015 07:49 AM, Pratik Prajapati wrote:
> >>>>>
> >>>>>         Hi,
> >>>>>
> >>>>>         I am working on LTP-DDT project (
> >>>>> https://github.com/rogerq/ltp-ddt)
> >>>>>         which i cross-compiled for my target and my target uses
> >> busybox.
> >>>>> But
> >>>>>         running it on my target gives me error as array operation is
> >> not
> >>>>>         supported in busybox.
> >>>>>
> >>>>>         I have attached script with this mail.
> >>>>>
> >>>>>         I am getting error for :
> >>>>>
> >>>>>         sh: /opt/ltp/testcases/bin/ddt/common/common.sh: line 305:
> >>>>>         syntax error:
> >>>>>         bad substitution
> >>>>>
> >>>>>         I tried this:
> >>>>>
> >>>>>         |305: shift
> >>>>>         306: index=0
> >>>>>         307: for  arg;
> >>>>>         308: do
> >>>>>         309:   x[$index]=$arg
> >>>>>         310:   ((index++))
> >>>>>         311: done
> >>>>>
> >>>>
> >>>> I am afraid that the work around is quite ugly. In this case
> >>>> you may use the evil eval:
> >>>>
> >>>> index=0
> >>>> for arg;
> >>>> do
> >>>>         eval x${index}=$arg
> >>>>         eval printf "x%s:\\\t%s\\\n" "${index}" "\$x${index}"
> >>>>         ((index++))
> >>>> done
> >>>>
> >>>> Yes, I know it is ugly and I said so.
> >>>> Arrays are one of the things I miss the most in ash.
> >>>>
> >>>> Brgds
> >>>> /S-G
> >>>>
> >>>>
> >>>>          |but i got error:|  syntax error: unexpected "(" (expecting
> >> "}")
> >>>>>
> >>>>>         Also couldn't found any solution on google.
> >>>>>
> >>>>>         How to make it work on busybox. Please help.
> >>>>>
> >>>>>
> >>>>>     Arrays is a bash feature, it is not supported by ash or standard
> >>>>>     shells. So unfortunately the short answer is that it does not
> work.
> >>>>>     However there are often ways to rework a script to avoid arrays.
> >>>>>
> >>>>>     Brgds
> >>>>>     /S-G
> >>>>>
> >>>>>
> >>>>>         Thanks,
> >>>>>
> >>>>>         Pratik
> >>>>>
> >>>>>
> >>>>>
> >>>>>         _______________________________________________
> >>>>>         busybox mailing list
> >>>>>         busybox at busybox.net <mailto:busybox at busybox.net>
> >>>>>         http://lists.busybox.net/mailman/listinfo/busybox
> >>>>>
> >>>>>
> >>>>>
> >>>>
> >>>
> >>>
> >>>
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> >
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