to get the k8s secret/resources by label selector, you can pass -l option to command and pass the label key=value.
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kubectl get secret -A -l created-by=creator
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kubectl get secret <my_secret_name> -o 'go-template={{index .data "<key_name>"}}' | base64 -d
ex:
kubectl get secret my-secret -o 'go-template={{index .data "username"}}' | base64 -d
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kubectl get secrets/db-user-pass --template={{.data.password}} | base64 -D
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kubectl get secrets/<secret-name> --template={{.data.<fieldname>}}
#add the required field name and secretname to get the values