Zk-shell

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Bug Handling
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- handle APIError (i.e.: ZooKeeper internal error)

Features
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- add ``--version``
- add ``stat`` alias for ``exists`` command
- add reconfig command (as offered by ZOOKEEPER-107)

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Bug Handling
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Features
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- allow connecting via an ssh tunnel ``(--tunnel)``

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Bug Handling
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- issue with tree command output (issue 28)
- intermittent issue with child_count (issue 30)

Features
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- sleep: allows sleeping (useful with loop)

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Bug Handling
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- don't allow running edit as root
- default to ``/usr/bin/vi`` for edit
- check that the provided editor is executable
- don't trust editor commands that are setuid/setgid
- treat None as "" when using the ``edit`` command

Features
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- add ``man`` alias for ``help`` command
- improve docstrings & use man pages style

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Bug Handling
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Features
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- edit: allows inline editing of a znode

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Bug Handling
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- fix bad variable reference when handling bad JSON keys
- ls: always sort znodes

Features
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- json_dupes_for_keys: finds duplicated znodes for the given keys
- pipe: pipe commands (though more like xargs -n1)