Describe the bug

It doesn't print anything

Steps To Reproduce

nix key generate-secret --key-name a > a.key
cat a.key | nix key convert-secret-to-public

Expected behavior

Public key shows. But it doesn't show any output.

Also noticed that nix key generate-secret --key-name a when not directed to a file also doesn't generate output. might be related

nix-env --version output

Additional context

Add any other context about the problem here.

Priorities

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