From: Sascha Hauer <sha@pengutronix.de>
To: Frank Wunderlich <frank-w@public-files.de>
Cc: barebox@lists.infradead.org
Subject: Re: use string as variable name
Date: Tue, 25 Jan 2022 15:16:22 +0100 [thread overview]
Message-ID: <20220125141622.GC23490@pengutronix.de> (raw)
In-Reply-To: <trinity-82a62e55-a3b0-43a3-8656-8a983119c309-1642931916783@3c-app-gmx-bs30>
Hi Frank,
On Sun, Jan 23, 2022 at 10:58:36AM +0100, Frank Wunderlich wrote:
> Hi,
>
> is it possible to use a string as variable-name?
>
> example:
>
> i=1
> img_$i=foo
>
> now i have defined $img_1, but how to display it using $i again?
>
> echo ${img_$i}
> echo ${img_${i}}
>
> alternative may be a variable-array, but it seems not possible
>
> img[$i]=bar
> img[1]=bar: No such file or directory
>
> i just want to create a dynamic list and access the items of this list by index
>
> another way may be appending new string with separator to existing string and split afterwards,
> but then i have the index-problem again.
>
> i know barebox shell is limited (but much more mighty than expected for just a bootloader),
> but maybe it is possible :)
Nah, you're kidding, the barebox shell is not limited ;)
#!/bin/sh
list="foo bar baz"
index=$1
i=0
for elem in $list; do
let i=$i+1
if [ "$i" = "$index" ]; then
result="$elem"
fi
done
echo result: $result
Regards,
Sascha
--
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prev parent reply other threads:[~2022-01-25 14:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-23 9:58 Frank Wunderlich
2022-01-25 14:16 ` Sascha Hauer [this message]
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