run any command in any container image in any Kubernetes namespace

krun

# krun busybox whoami

krun(){
  local NAMESPACE=default
  local PRIVILEGED=false
  while getopts 'n:pu:' OPT; do
    case $OPT in
      n) NAMESPACE=$OPTARG
         ;;
      p) PRIVILEGED=true
         ;;
      u) RUNAS=$OPTARG
         ;;
    esac
  done
  shift $(( OPTIND -1 ))
  local IMAGE=$1; shift;
  eval kubectl -n "$NAMESPACE" run \
    --privileged "${PRIVILEGED}" \
    --image "$IMAGE" \
    "${RUNAS:+ --as $RUNAS}" \
    --tty --stdin --rm \
    --restart=Never \
    "krun-${IMAGE//[:\/.]/-}" \
    --command -- \
      "${@}"
}