How do I check to see if an environment variable exists?

bob at bob at
Sat Nov 24 09:03:00 EST 2018

$# tells you how many parameters there are for a script. Perhaps if $# > 0 then... instead might work (I’ve not tried that). You might find using environment() potentially helps as well. The Dictionary has the details. If neither of those options work let me know. I have another way you could tackle the issue.

- Bob Hall

> On Nov 23, 2018, at 5:27 PM, Stephen MacLean via use-livecode <use-livecode at> wrote:
> However, the exists($1) never returns true, even when it should. Which leads to to believe that’s not what I want to use.
> How would I test to see if the $1 variable exists?

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