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Snippet to check all required environment variable are present before executing a script.

ReqVars=("EX_VAR_1" "EX_VAR_2" "EX_VAR_3")

for i in "${ReqVars[@]}"; do
  if [[ -z ${!i} ]]; then
    echo "$i is a required environment variable, please ensure it is set correctly. Then re-run this script."
    exit 1
  fi
done
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