vi env.sh
variable1=value1
variable2=value2
variable3=value3
variable4=value4
kubectl create cm cm7 --from-env-file=env.sh
kubectl get cm
NAME DATA AGE
cm1 0 36m
cm2 0 36m
cm3 1 30m
cm4 2 23m
cm5 3 11m
cm6 1 2m4s
cm7 4 3s
kubectl create cm cm6 --from-file=env.sh
variables name cannot be started from numbers
e.g
355 variables=value1 >> wrong method
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