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You didn't just mess up bash. It sounds like you uninstalled most of the system management utilities that are required on the PR2. Did the package manager ask you something like:
You are about to do something potentially harmful.
To continue type in the phrase 'Yes, do as I say!'
(You should never answer yes to that prompt without consulting a PR2 support representative first).
You should be able to get back to mostly working by reinstalling the pr2-core-groovy and pr2-network packages:
sudo apt-get install pr2-core-groovy pr2-network
You should probably follow that up by running a systemcheck to make sure things are functioning properly.
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