How do I use vi keys in ipython under *nix?

Question

Currently in Bash I use `set -o vi` to enable vi mode in my bash prompt. How do I get this going in ipython?

Accepted Answer

In case someone's wandering in here recently, IPython 5.0 switched from readline to prompt_toolkit, so an updated answer to this question is to pass an option:

```
$ ipython --TerminalInteractiveShell.editing_mode=vi
```

... or to set it globally in the profile configuration (`~/.ipython/profile_default/ipython_config.py`; create it with `ipython profile create` if you don't have it) with:

```
c.TerminalInteractiveShell.editing_mode = 'vi'
```

How do I use vi keys in ipython under *nix?

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