On Sat, Aug 30, 2014 at 11:19 AM, lolilolicon <loliloli...@gmail.com> wrote:
> The following is my test scripts and their output.
> They are very similar, and I do not think they should result in
> different output.
> The output I expected from all of them is:
>
> v1
> v2
>
> But as you can see, only 1 in the following 4 cases does it meet my
> expectation. In the other 3 cases, the nameref attribute of the variable
> 'ref' is lost unexpectedly.
It seems to be a namespace / scope problem.
Another test script reveals that without assigning ref explicitly, such
as using the "for ... in" construct, it behaves as expected.
=== script ===
#!/bin/bash
declare -a arr=('dict[k1]' 'dict[k2]')
declare -A dict='([k1]=v1 [k2]=v2)'
declare -n ref
for ref in "${arr[@]}"; do
echo $ref
done
ref=${arr[0]}
echo $ref
ref=${arr[1]}
echo $ref
--- output ---
v1
v2
dict[k1]
dict[k2]
As you see, once ref is assigned explicitly, or indeed, is assigned for
a second time, its nameref attribute is lost.
