jq is a lightweight and flexible command-line JSON processor.
wget http://dl.fedoraproject.org/pub/epel/epel-release-
rpm -ivh epel-release-latest-7.noarch.rpm
yum install -y jq
用法示例：通过jq对返回的json处理，获取pod使用的镜像
[root@localhost ~]# kubectl get pods -n kube-system -o json | jq -r '.items[] | select(.metadata.name).spec.containers[].image'
registry.cn-beijing.aliyuncs.com/kubesphereio/kube-controllers:v3.16.3
registry.cn-beijing.aliyuncs.com/kubesphereio/node:v3.16.3
registry.cn-beijing.aliyuncs.com/kubesphereio/coredns:1.6.9
registry.cn-beijing.aliyuncs.com/kubesphereio/coredns:1.6.9
registry.cn-beijing.aliyuncs.com/kubesphereio/kube-apiserver:v1.20.4
registry.cn-beijing.aliyuncs.com/kubesphereio/kube-controller-manager:v1.20.4
registry.cn-beijing.aliyuncs.com/kubesphereio/kube-proxy:v1.20.4
registry.cn-beijing.aliyuncs.com/kubesphereio/kube-scheduler:v1.20.4
registry.cn-beijing.aliyuncs.com/kubesphereio/k8s-dns-node-cache:1.15.12
registry.cn-beijing.aliyuncs.com/kubesphereio/provisioner-localpv:2.10.1
