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Very cool. Is there a way to have a notion of a session, saving state between runs?

No, it's stateless right now. What is your requirement though? How do you define a session? Are you referring to "snapshotting" between sessions?

Then you can run:

```

zerobox --snapshot -- sh -c 'echo "abc" > a'

```

and also `zerobox snapshot list/diff/restore`