How to write shell script to get the pod status of kubernetes cluster

In my k8 cluster I have pods running that the pod name contains the word "inventory" (actually 2pods with this name)
I need to write a shell script to delete deployment and re-deploy and then it should check the specific pod is running or not and then display a message.
Here is what I tried.

#!/bin/bash
cd /apps/application/application_yamls_develop/deployment-artifacts/inventory-service
kubectl delete -f inventory-service.yaml -n back-end
kubectl apply -f inventory-service.yaml -n back-end
sleep 20

pod_name="inventory"
namespace="back-end"

# Get the pod status
pod_status=$(kubectl get pods -n "$namespace" -o jsonpath="{.items[?(@.metadata.name.includes('$pod_name'))].status.phase}")

# Check if any matching pod is running
if [[ -n "$pod_status" ]]; then
  echo "Pod running"
else
  echo "Pod not running"
fi

But this is giving the bellow error.

error: error parsing jsonpath {.items[?(@.metadata.name.includes('inventory'))].status.phase}, unclosed array expect ]

Can someone please pointout the issue.

Thanks..!

Can you try this

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-html -->

#!/bin/bash

pod_name="devopslk"
namespace="devops"

# Get the pod status
pod_status=$(kubectl get pod "$pod_name" -n "$namespace" -o jsonpath='{.status.phase}')

# Check if any matching pod is running
if [[ -n "$pod_status" ]]; then
  echo "Pod running"
else
  echo "Pod not running, Current status: $pod_status"
fi

<!-- end snippet -->

Found answer in k8s docs

# kubectl does not support regular expressions for JSONpath output
# The following command does not work
kubectl get pods -o jsonpath='{.items[?(@.metadata.name=~/^test$/)].metadata.name}'

# The following command achieves the desired result
kubectl get pods -o json | jq -r '.items[] | select(.metadata.name | test("test-")).spec.containers[].image'

And partial name in filter statement won't work also you have to set full pod name here:

$ k -n $ns get po -o jsonpath='{.items[?(@.metadata.name=="test")].metadata.name}'

$ k -n $ns get po -o jsonpath='{.items[?(@.metadata.name=="test-56b87dd7dc-4fcwn")].metadata.name}' 
test-56b87dd7dc-4fcwn

So first you need to get all pods and grep them some how to get the needed pod and than check it status. Or use jq as suggested in k8s docs.

Or get names and statuses at the same time:

    $ k -n $ns get po -o jsonpath="{range .items[*]}[{.metadata.name},{.status.phase}]{'\n'}{end}" |\
    grep -Ei ".*$pod_name.*running" || echo fail

And then again grep needed pod and you'll get the status.

This can be achieved using pod label as specified in below script(modified accordingly which is provided by you)

#!/bin/bash
#Namespace Name
namespace="backend"
#Provide label name which is specified in pod definition
appname="inventory"

# Get the pod name
pod_name=$(kubectl get pod -n $namespace -l app=$appname -o=jsonpath="{range .items[*]}{.metadata.name}")

# Get the pod status
pod_status=$(kubectl get pods -n $namespace -o=jsonpath="{.items[?(@.metadata.name == '$pod_name')].status.phase}")

# Check if any matching pod is running
if [[ ! -z "$pod_status" ]]; then
  echo "Pod running"
else
  echo "Pod not running"
fi