Watching .bash_history

[David Kirk]

Hey,

Is it possible to see what commands a user is typing as they happen?  I'd "tail -f .bash_history", but it doesn't seem to update until the user logs out.  Where does it store it during the active session?

I have given a vendor root access to one of my servers so they can fix a database that I broke, and I want to see what he is doing (for educational purposes rather than lack of trust).

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Thanks

David Kirk