[platypus-dev] Using ARGV in a Bash Script

How would one use the ARGV array within a bas script?
I suspect I'm doing something wrong in a very basic way. But it would be my understanding that something like this: 

echo "${ARGV[0]}"
Would return the first value in the ARGV array. Instead I get an empty space.
This brings me to something that could really be a boon to new people if it were in the documentation.
There isn't a real list of available variables that Platypus gives to a script. They are mentioned here and there. But they aren't consolidated anywhere. And worse they are only shown used in or two cases which can be very confusing. We don't need a use it like this in PHP, PERL, BASH, etc. But we could at least have a list of how the variable shows up in each of the major scripting languages.
Thanks beforehand for any help or pointers people can throw my way. I appreciate it. :) 

Jamie
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