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Subject: Re: new user questions and issues
From: Kannan Varadhan <kvaradhan3@gmail.com>
In-Reply-To: <150510220246.ZM10136@torch.brasslantern.com>
Date: Mon, 11 May 2015 10:43:17 -0700
Cc: zsh-users@zsh.org
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References: <67F1153E-5D3C-4D29-BDD0-1BB9C71FF55A@gmail.com> <150510220246.ZM10136@torch.brasslantern.com>
To: Bart Schaefer <schaefer@brasslantern.com>
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Well, ok, that is interesting.

The reason to declare local is to be tight and explicit about variable =
scope.  I have been bitten with other shells in which variables are =
visible far outside where I would expect, leading to unexpected side =
effects.  The most egregious is with loop control variables for me.

What I really desire is that the variable not be inherited by or visible =
to any called functions.

Kannan


> On May 10, 2015, at 10:02 PM, Bart Schaefer =
<schaefer@brasslantern.com> wrote:
>=20
> Most of this has been answered already, throwing one extra remark.
>=20
> On May 6, 10:37am, Kannan Varadhan wrote:
> }
> } Issue #2.  Overridden local variables get echoed?
>=20
> The tidbit that no one has explicitly mentioned is that "local" et al.
> has function scope, so it makes no sense to declare something "local"
> inside a loop body.  (In an if/else, it could make sense, as long as
> the if/else is not itself inside a loop, but the variables declared
> there will persist beyond the "fi".)
>=20
> If you for some reason need a declaration to be local to a loop, use
> an anonymous function context like this:
>=20
>    local _t2
>    for _t2 in 0 1 2 ; do
>      function {
>        local _t3
>        _t3=3DXXX__${_t2}__
>      }
>    done
>=20