Convert downloaded AWS access creds to env vars

aws_to_env.rb

#!/usr/bin/env ruby

# Use ENV var if needed, e.g. ".zshenv"
shell_init_file = File.expand_path(ENV['SHELL_INIT_FILE'] || '~/.bash_profile')
aws_creds_file  = File.expand_path(ENV['CREDS_FILE']      || '~/Downloads/credentials.csv')

require 'csv'
csv = CSV.parse(File.read(aws_creds_file), headers: true)
row = csv.first.to_hash
File.open(shell_init_file, 'a') do |f|
  f.write ["",
      "export AWS_ACCESS_KEY_ID=#{row['Access Key Id']}",
      "export AWS_SECRET_ACCESS_KEY=#{row['Secret Access Key']}"
    ].join("\n")
end