# Replace all variables in template with those in environment.
source <(echo 'cat <<EOF >topo.yml'; cat ${TOPOLOGIES[0]}; echo EOF;) || {
die "Topology file create failed!"
# Replace all variables in template with those in environment.
source <(echo 'cat <<EOF >topo.yml'; cat ${TOPOLOGIES[0]}; echo EOF;) || {
die "Topology file create failed!"