Download CLI:
wget https://mirror.openshift.com/pub/openshift-v4/clients/ocp/latest-4.2/openshift-client-linux-4.2.18.tar.gz
Untar and copy oc and kubectl in $PATH.
Drop ~/.ocp4:
RHT_OCP4_MASTER_API=https://api.ocp-eu2.prod.example.com:6443
RHT_OCP4_DEV_USER=login
RHT_OCP4_DEV_PASSWORD=xxxxxx
Make sure the file is only readable by you.
Source the file:
source ~/ocp4
Login:
oc login -u $RHT_OCP4_DEV_USER -p $RHT_OCP4_DEV_PASSWORD $RHT_OCP4_MASTER_API