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Re: new user questions and issues
About local: instead of setting an option it looks like you can use
typeset +g _t3
(`typeset +g`, `typeset` and `local` are almost equivalent, but typeset without any flags listed in documentation exhibits the same behaviour as `local`). Specifically in the example you can use
local _t3=XXX__${_t2}__
: when there is an assignment `local` will not print previous value.
08.05.2015, 00:47, "Kannan Varadhan" <kvaradhan3@xxxxxxxxx>:
> 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@xxxxxxx> wrote:
>>
>> I can snipe the easier to explain ones.
>> On 05/06/2015 01:37 PM, Kannan Varadhan wrote:
>>> Issue #1: Programmatic Scripting, how to?
>>>
>>> I would like to do the following:
>>>
>>> for var in path infopath manpath cdpath ; do
>>> typeset -agU $var
>>> local capsvar
>>> capsvar=$(echo $var | tr 'a-z' 'A-Z')
>>> $var=( $(echo ${$capsvar} | sed 's/:/ /g') )
>>> done
>>>
>>> But this does not work, because ${$capsvar} gets me a zsh: bad substitution.
>>> Is there any way to achieve this in zsh?
>> You can use the parameter expansion flag P. ''${(P)capsvar}''
>>
>> With the exception of infopath, The arrays you are trying to define are
>> already created and tied to the uppercase scalar parameters.
>> Any change made to one is reflected in the other.
>>
>> echo by default interprets c string escapes, you can disable that with
>> the -E option.
>>
>> You could avoid the command substitution with the parameter expansion
>> flag U ''capsvar=${(U)var}'' to change the case of the value.
>>
>> $var=(...) is also an error. ''set -A $var element1 element2 ...'' will
>> allow you to indirectly set arrays
>>> Issue #2. Overridden local variables get echoed?
>>>
>>> ~ 5% cat lib/zsh/test2 9:55:52
>>> function test2
>>> 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.
>>
>> 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.
>>
>> 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.
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