Pass environment variables to vagrant shell provisioner

It looks like passing environment variables when calling vagrant up is simple if you're using a Ruby provisioner: VAR=123 vagrant up In the Vagrantfile: ENV['VAR'] How do I do this with the :shell provisioner? Simply doing this does not seem to work: $VAR

[yyamano]

“config.vm.provision "shell", path: "provisionscript.sh", env: {"MYVAR" => "value"}”

[kgrock]

Pass environment variables to vagrant shell provisioner