How to write jenkinsfile that will access openshift and run few commands

I am new to Jenkins, can someone help me to write Jenkinsfile that access openshift run few of commands, and return the report I know commands to run manually in open shift but don't know how to do in Jenkins

There are a few good introductions available on how to access OpenShift using the OpenShift Jenkins Plugin or on how to run generic commands using sh:

• Using OpenShift Pipeline Plugin with External Jenkins

• Building Declarative Pipelines with OpenShift DSL Plugin

• More generic: Jenkins Pipeline: running external programs with sh