read -r -d

• https://docs.aws.amazon.com/eks/latest/userguide/create-kubeconfig.html

#!/bin/bash
read -r -d '' KUBECONFIG <<EOF
apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: $certificate_data
    server: $cluster_endpoint
  name: arn:aws:eks:$region_code:$account_id:cluster/$cluster_name
contexts:
- context:
    cluster: arn:aws:eks:$region_code:$account_id:cluster/$cluster_name
    user: arn:aws:eks:$region_code:$account_id:cluster/$cluster_name
  name: arn:aws:eks:$region_code:$account_id:cluster/$cluster_name
current-context: arn:aws:eks:$region_code:$account_id:cluster/$cluster_name
kind: Config
preferences: {}
users:
- name: arn:aws:eks:$region_code:$account_id:cluster/$cluster_name
  user:
    exec:
      apiVersion: client.authentication.k8s.io/v1beta1
      command: aws
      args:
        - --region
        - $region_code
        - eks
        - get-token
        - --cluster-name
        - $cluster_name
        # - --role
        # - "arn:aws:iam::$account_id:role/my-role"
      # env:
        # - name: "AWS_PROFILE"
        #   value: "aws-profile"
EOF
echo "${KUBECONFIG}" > ~/.kube/config

Related

-d delim
The first character of delim is used to terminate the input line, rather than newline. If delim is the empty string, read 
will terminate a line when it reads a NUL character.

See also

• read, read -r, read -p, input(), read -r -d, EOF, readarray