Change kubernetes cluster

kc.sh

#!/bin/bash
# 

CUR_CLUSTER=$(basename $(readlink -f $(find ~/.kube -type l -name "config")) | awk -F'.' '{ print $2 }')
NEW_CLUSTER=

while :; do
  case $1 in
    -h|-\?|--help)
cat << EOF
Usage: ${0##*/} [-h] [CLUSTER]
Change current Kubernetes cluster.

    -h          display this help and exit
EOF
      exit
      ;;
    *)
      if [[ -n "$1" ]]; then
        NEW_CLUSTER="$1"
      fi
  esac
  shift
  if [[ -z $1 ]]; then
    break;
  fi
done

if [ -z "$NEW_CLUSTER" ]; then
  echo "Select a new cluster:"
  echo
  CLUSTERS=( $(find ~/.kube -type f -name "config.*" -exec basename {} \; | awk -F'.' '{ print $2 }' | sort) )
  CLUSTER_OPTS=()
  CLUSTER_LABELS=()
  for CLUSTER in "${CLUSTERS[@]}"; do
    CLUSTER_OPTS+=("$CLUSTER")
    if [[ $CLUSTER == $CUR_CLUSTER ]]; then
      CLUSTER_LABELS+=("$(tput setaf 6)$CLUSTER$(tput sgr0) (current)")
    else
      CLUSTER_LABELS+=("$CLUSTER")
    fi
  done

  I=0
  for LABEL in "${CLUSTER_LABELS[@]}"; do
    printf '%s\n' "$((++I))) $LABEL"
  done >&2

  NUM_ITEMS=${#CLUSTER_LABELS[@]}
  PS3="$(tput setaf 6)  > Cluster: $(tput sgr0)"
  while :; do
    printf %s "${PS3}" >&2
    read -r INDEX
    # Make sure that the input is either empty or that a valid index was entered.
    [[ -z $INDEX ]] && break  # empty input
    (( INDEX >= 1 && INDEX <= NUM_ITEMS )) 2>/dev/null || { continue; }
    break
  done

  if [[ -n $INDEX ]]; then
    NEW_CLUSTER="${CLUSTER_OPTS[$INDEX - 1]}"
  else
    NEW_CLUSTER=$CUR_CLUSTER
  fi
fi

if [[ -n $NEW_CLUSTER ]]; then
  if [[ $CUR_CLUSTER != $NEW_CLUSTER ]]; then
    rm -f ~/.kube/config
    ln -s ~/.kube/config.$NEW_CLUSTER ~/.kube/config
    echo "Set cluster to $(tput setaf 6)$NEW_CLUSTER$(tput sgr0)"
  else
    echo "Current cluster $(tput setaf 6)$CUR_CLUSTER$(tput sgr0) (not changed)"
  fi
  echo
fi