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Subject: Re: new user questions and issues
From: Kannan Varadhan <kvaradhan3@gmail.com>
In-Reply-To: <554A7E95.7000306@gmx.com>
Date: Thu, 7 May 2015 14:46:11 -0700
Cc: zsh-users@zsh.org
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References: <67F1153E-5D3C-4D29-BDD0-1BB9C71FF55A@gmail.com> <554A7E95.7000306@gmx.com>
To: Eric Cook <llua@gmx.com>
X-Mailer: Apple Mail (2.2098)

Thank you Eric.

I had worked out other ways of achieving #1, just wanted to learn if =
there was a good way to do it.

The others, I get.

Thanks,

Kannan

> On May 6, 2015, at 1:50 PM, Eric Cook <llua@gmx.com> wrote:
>=20
> I can snipe the easier to explain ones.
> On 05/06/2015 01:37 PM, Kannan Varadhan wrote:
>=20
>> Issue #1:  Programmatic Scripting, how to?
>>=20
>> I would like to do the following:
>>=20
>> for var in path infopath manpath cdpath ; do
>>    typeset -agU $var
>>    local capsvar
>>    capsvar=3D$(echo $var | tr 'a-z' 'A-Z')
>>    $var=3D( $(echo ${$capsvar} | sed 's/:/ /g') )
>> done
>>=20
>> But this does not work, because ${$capsvar}  gets me a zsh: bad =
substitution.
>> Is there any way to achieve this in zsh?
>>=20
> You can use the parameter expansion flag P. ''${(P)capsvar}''
>=20
> With the exception of infopath, The arrays you are trying to define =
are
> already created and tied to the uppercase scalar parameters.
> Any change made to one is reflected in the other.
>=20
> echo by default interprets c string escapes, you can disable that with
> the -E option.
>=20
> You could avoid the command substitution with the parameter expansion
> flag U ''capsvar=3D${(U)var}'' to change the case of the value.
>=20
> $var=3D(...) is also an error. ''set -A $var element1 element2 ...'' =
will
> allow you to indirectly set arrays
>> Issue #2.  Overridden local variables get echoed?
>>=20
>> ~ 5% cat lib/zsh/test2                                                =
  9:55:52
>> function test2=20
>>    print why is the previous value echoed when a local variable is =
'overridden?'
> It actually happens when you use typeset, local, etc. on a parameter
> that is already defined. You can use the option TYPESET_SILENT option =
to
> silence it.
>=20
> from the typeset section of zshbuiltins(1):
> If  the  shell  option  TYPESET_SILENT  is  not  set, for each =
remaining
> name that refers to a parameter that is set, the name and value of the
> parameter are printed in the form of an assignment.  Nothing is =
printed
> for newly-created parameters, or when any attribute flags listed below
> are given along with the name.  Using `+' instead of minus to =
introduce
> an attribute turns it off.
>=20
>=20
> Pretty sure #3 and #4 is due to how typeset creates a local parameters
> when used in a function. So typeset -U PATH create a new parameter
> without a value, with the -U attribute.