Pass command-line result as an argument to next command

Question

Trying to insert output from this:

kubectl get pods | grep -Eo '^[^ ]+' | grep portal

Into this:

kubectl exec -it <here> portal bash

Tried:

kubectl exec -it `kubectl get pods | grep -Eo '^[^ ]+' | grep portal ` portal bash

But no luck.

Answer 1

kubectl exec -it "$(kubectl get pods | grep -Eo '^[^ ]+' | grep portal)" bash

Or, even more:

kubectl exec -c portal-container -it "$(kubectl get pods | grep -Eo '^[^ ]+' | grep portal)" bash