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This isn't really specific to this forum, but from the Terminal app, you can type export VARIABLE_NAME="some value for the variable"
I used this command: echo "export PATH=/mydirectorypath:$PATH" >> ~/.bash_profile
and it works.
I am trying to Alexa Voice Service Sample App (Java), so I came to this forum.
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Got response status code 500 with access token from LWA iOS sdk
How to get started programming/editing AVS code?
iOS app and Alexa speaker
How to register for Audio Front End Dev Kits for AVS?
Integrate Alexa Skills and Alexa Voice service