First call to oct.sh assumes it is not in your PATH and thus ./oct.sh but you don't repeat that all the way down the wrapper script.

Should be:

Import the template

./oct.sh --import-template --library "${library}" --template-url "${template_url}"

Install the desired OKD tools

./oct.sh --install-tools --release 4.6

Launch the prerun to generate and modify the ignition files

./oct.sh --prerun --auto-secret

Deploy the nodes for the cluster with the appropriate ignition data

./oct.sh --build --template-name "${template_name}" --library "${library}" --cluster-name "${cluster_name}" --cluster-folder "${cluster_folder}" --network-name "${network_name}" --installation-folder "${install_folder}" --master-node-count ${masters_count} --worker-node-count ${workers_count}

Turn on the cluster nodes

./oct.sh --cluster-power on --cluster-name "${cluster_name}" --master-node-count ${masters_count} --worker-node-count ${workers_count}