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Home > Archive > Unix Shell > August 2007 > Variable substitution
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Variable substitution
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| Hi All,
I have the below requirement. I Checked in google and
few of the sites and groups and unable to find the solution.
Requirement is as follows.
===
A="XYZ"
B="ABC"
XYZ_ABC="Status_300"
I would like to construct the string XYZ_ABC using $A abd $B and print
the value of $XYZ_ABC
It's like
> echo $A_$B
XYZ_ABC
Using the above values of $A_$B
Print the value of $XYZ_ABC
Something like
> echo $ ( $A_$B) should print the value "Status_300"
Thanks in advance,
Rao
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| Radoulov, Dimitre 2007-08-27, 7:23 am |
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"Dattu" <datteswararao@gmail.com> wrote ...
[...]
> Requirement is as follows.
>
> ===
> A="XYZ"
> B="ABC"
> XYZ_ABC="Status_300"
>
> I would like to construct the string XYZ_ABC using $A abd $B and print
> the value of $XYZ_ABC
>
> It's like
>
> XYZ_ABC
>
> Using the above values of $A_$B
>
> Print the value of $XYZ_ABC
[...]
bash 3.2.25(16) $ A="XYZ"
bash 3.2.25(16) $ B="ABC"
bash 3.2.25(16) $ XYZ_ABC="Status_300"
bash 3.2.25(16) $ eval "echo \$${A}_${B}"
Status_300
Dimitre
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| Thanks a lot for the reply ....
Any other ways to caliculate the same ?
Thanks,
Rao
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| On 27 Aug., 13:58, Dattu <datteswara...@gmail.com> wrote:
> Thanks a lot for the reply ....
>
> Any other ways to caliculate the same ?
What "the same"? Please quote context!
And what's wrong with the posted solution?
>
> Thanks,
> Rao
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| Hi Janis,
Sorry for the confusion.
On Aug 27, 4:01 pm, Janis <janis_papanag...@hotmail.com> wrote:
> On 27 Aug., 13:58, Dattu <datteswara...@gmail.com> wrote:
>
>
[vbcol=seagreen]
> What "the same"? Please quote context!
"the same" means for the posted problem as above(Original post).
> And what's wrong with the posted solution?
Nothing worng with solution. It's working fine for me. But, I would
like to know the other kinds of solutions for the problem.
>
>
>
>
>
>
> - Show quoted text -
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| Radoulov, Dimitre 2007-08-27, 7:23 am |
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"Dattu" wrote in message ...
[...]
[...]
[vbcol=seagreen]
> But, I would
> like to know the other kinds of solutions for the problem.
zsh 4.3.2 % eval print $"${!A}_${!B}"
eval print $"${A="XYZ"}_${B="ABC"}"
Status_300
Dimitre
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| On 27 Aug., 14:07, Dattu <datteswara...@gmail.com> wrote:
> Hi Janis,
>
> Sorry for the confusion.
>
> On Aug 27, 4:01 pm, Janis <janis_papanag...@hotmail.com> wrote:
>
>
>
>
> "the same" means for the posted problem as above(Original post).
I thought so, but since this is Usenet and not a web forum you
should always quote all necessary context.
>
>
> Nothing worng with solution. It's working fine for me. But, I would
> like to know the other kinds of solutions for the problem.
Using eval is the standard way for this kind of "meta-indirection".
Janis
[vbcol=seagreen]
>
>
>
>
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