1. Create a `export-pod-name.sh` file with the following content:

```shell
POD_NAME=$(kubectl get pods --sort-by=.metadata.creationTimestamp --selector=YOUR-SELECTOR-KEY=YOUR-SELECTOR-VALUE -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | tail -n1)
# Example:
# POD_NAME=$(kubectl get pods --sort-by=.metadata.creationTimestamp --selector=app=nginx -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | tail -n1)

export POD_NAME=$POD_NAME
```

1. Run script (notice the dot at the beginning!)
```shell
. export-pod-name.sh
```