kubectl get filter by annotation

.bashrc

# including this inside .bashrc and use the kfilter command on your shell

function escape_things() {
  echo $1 | sed -E "s@([\.\/])@\\\\\1@g"
}

function kfilter() {
  # kfilter -n <namespace> <annotation> <value>  # search on a single namespace
  # kfilter <annotation> <value>                 # all namespaces (takes longer)
  if [ "_$1" = "_-n" ] ; then
    namespace=("-n" "$2")
    shift ; shift
  else
    namespace=("-A")
  fi

  ktype="$1" ; shift
  annotation_name="$(escape_things "$1")"
  annotation_value="$2"

  kubectl get "${ktype}" "${namespace[@]}" \
    "-o=jsonpath='{.items[?(@.metadata.annotations.${annotation_name}==\"${annotation_value}\")]}'"
}