title: display failed pods from kubectl output
body: <p>I want to write a wrapper on <code>kubectl</code> to display only failed pods which means it should only display items whose Ready column values are not the same (i.e <code>0/1, 0/2, 1/2, 2/3,</code> etc.)</p>
  
  <pre><code>$ kubectl get pods --all-namespaces
  NAMESPACE       NAME                                        READY     STATUS             RESTARTS   AGE
  default         pod-with-sidecar                            1/2       ErrImagePull       0          39s
  kube-system     calico-node-chcqq                           2/2       Running            2          7d
  kube-system     calico-policy-controller-6449789dd6-z5t5j   1/1       Running            0          7d
  kube-system     etcd                                        1/1       Running            0          7d
  kube-system     kube-apiserver                              1/1       Running            2          7d
  kube-system     kube-controller-manager                     1/1       Running            0          7d
  kube-system     kube-dns-5c76d6bddb-8zhmq                   3/3       Running            1          7d
  kube-system     kube-proxy-xq8j6                            1/1       Running            0          7d
  kube-system     kube-scheduler-                             1/1       Running            0          7d
  kube-system     tiller-deploy-5b7cb9cfd7-j725s              1/1       Running            0          7d
  my-system       glusterfs-brick-0                           0/2       Pending            0          3m
  my-system       sticky-scheduler-6d968f8d74-xvjqn           0/1       ImagePullBackOff   0          4m
  </code></pre>
  
  <p>so from the above output i want to print these failed pods</p>
  
  <pre><code>NAMESPACE       NAME                                        READY     STATUS             RESTARTS   AGE
  default         pod-with-sidecar                            1/2       ErrImagePull       0          4m
  my-system       glusterfs-brick-0                           0/2       Pending            0          56s
  my-system       sticky-scheduler-6d968f8d74-xvjqn           0/1       ImagePullBackOff   0          8m
  </code></pre>
  
  <p>This works!</p>
  
  <pre><code>$ kubectl get pods --all-namespaces | grep -vE '1/1|2/2|3/3'
  
  NAMESPACE       NAME                                        READY     STATUS             RESTARTS   AGE
  default         pod-with-sidecar                            1/2       ErrImagePull       0          4m
  my-system       glusterfs-brick-0                           0/2       Pending            0          56s
  my-system       sticky-scheduler-6d968f8d74-xvjqn           0/1       ImagePullBackOff   0          8m
  </code></pre>
  
  <p>But it won't work if i have <code>2/4,0/4,0/5,0/6</code> etc in the <code>Ready</code> column, what can i do with <code>grep -vE '1/1|2/2|3/3'</code> to make it work for all such cases</p>
  
  <p>Reference: <a href="https://github.com/kubernetes/kubernetes/issues/49387" rel="nofollow noreferrer">https://github.com/kubernetes/kubernetes/issues/49387</a></p>