[9fans] Why Plan 9 uses $ifs instead of $IFS?

[giacomo@tesio.it (Giacomo Tesio)]

2017-10-17 18:00 GMT+02:00 Skip Tavakkolian <skip.tavakkolian at gmail.com>:

> On Tue, Oct 17, 2017, 8:05 AM Giacomo Tesio <giacomo at tesio.it> wrote:
>
>> Really? Just aesthetics? :-o
>>
>
>
>> This would flips the question a bit: I wonder why the same designers
>> chose uppercase variable names while designing Unix... :-)
>>
>
> Programs can evolve, why not names? There was no expectation that sh
> scripts would work in rc.
>


They can! For sure! But usually they evolve towards a goal... and I'm a
curious person.. :-)

Also this is not about sh scripts run by rc, but sh script run by an sh
shell started by rc.
Or, rc scripts run by an rc shell invoked by an sh.

Just to explain, for example, you could have an sh script that changes
$USER and then invoke psu that would keep using the previous $user.


Giacomo
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