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README.md

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@@ -14,6 +14,11 @@ IRuby is a Ruby kernel for [Jupyter project](http://try.jupyter.org/).
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* [ffi-rzmq](https://github.com/chuckremes/ffi-rzmq) and [libzmq](https://github.com/zeromq/libzmq)
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* [CZTop](https://gitlab.com/paddor/cztop) and [CZMQ](https://github.com/zeromq/czmq)
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If both ffi-rzmq and cztop are installed, ffi-rzmq is used. If you prefer cztop, set the following environment variable.
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```sh
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export IRUBY_SESSION_ADAPTER="cztop"
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```
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We recommend the [Pry](https://github.com/pry/pry) backend for full functionality.
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### Ubuntu

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