Script to delete all resources of a specific type, in a specific namespace in a kubernetes cluster

delete_k8s_resources.sh

#!/bin/bash

usage() { echo "Usage: $0 [-n <string>] [-t <string>]" 1>&2; exit 1; }

while getopts ":n:t:" o; do
    case "${o}" in
        n)
            namespace=${OPTARG}
            ;;
        t)
            type=${OPTARG}
            ;;
        *)
            usage
            ;;
    esac
done
shift $((OPTIND-1))

if [ -z "${namespace}" ] || [ -z "${type}" ]; then
    usage
fi

echo "deleting all resources with type '$type' in namespace '$namespace'";

if [ -z $namespace ]; then
    echo "namespace argument -n is required. $usage"
    exit 1
fi
if [ -z $type ]; then
    echo "resource type argument -t is required. $usage"
    exit 1
fi

resources_arr=($(kubectl get $type -n $namespace --no-headers -o custom-columns=":metadata.name"))

for i in "${resources_arr[@]}"
do
   kubectl delete $type "$i" -n $namespace
done