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.

What does "no luck" mean? Did you get some kind of error? Does the command in the command substitution return the correct thing? What happens if you use ... -it "$(...)" ... instead of the backticks (quoting is difficult with backticks). — Kusalananda
– Kusalananda ♦, Commented Jun 13, 2019 at 16:18
@Kusalananda It says: Defaulting container name to portal-container. Use 'kubectl describe pod/portal-74767c88b-92sct' to see all of the containers in this pod. rpc error: code = 2 desc = oci runtime error: exec failed: container_linux.go:247: starting container process caused "exec: \"portal\": executable file not found in $PATH" In both cases — Pavel M.
– Pavel M., Commented Jun 13, 2019 at 16:37

Pavel M. · Accepted Answer · 2019-06-13 16:50:19Z

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

answered Jun 13, 2019 at 16:44

Pavel M.

1115 bronze badges

1 Answer 1