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Re: Unset array doesn't work

From: Nikolai Kondrashov
Subject: Re: Unset array doesn't work
Date: Mon, 12 Feb 2018 20:13:23 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

On 02/12/2018 04:26 PM, Chet Ramey wrote:
On 2/12/18 1:41 AM, Nikolai Kondrashov wrote:
Hi Chet,

On 02/12/2018 01:31 AM, Chet Ramey wrote:
On 2/11/18 1:06 PM, Nikolai Kondrashov wrote:
Hi everyone,

I think I'm hitting a bug in Bash 4.4.12 (on Debian Stable): at some point
an "unset" of a global array variable doesn't work inside a function, in
"dkms" script from DKMS package. Adding another "unset" of the same
next to it fixes the issue.

Do you have a local variable with the same name "shadowing" the global?

Thank you for the quick response!

Looking more into this, the variable in question is defined as a local in the
calling function and is being "unset" in a function called from that one.

This is bash's dynamic scoping. The visibility of a local variable is
restricted to a function and its children, and `unset' removes the
currently-visible instance. Removing such an instance can `unconver' an
instance in a previous scope.

Thank you, Chet. Your and Clark's explanation help a lot.
Sorry for the noise.


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