Finding the subcommand names

Hi,

The most recent version of IPython complains when I run `ipython notebook`:

> $ ipython notebook
> [TerminalIPythonApp] WARNING | Subcommand `ipython notebook` is deprecated and will be removed in future versions.
> [TerminalIPythonApp] WARNING | You likely want to use `jupyter notebook`... continue in 5 sec. Press Ctrl-C to quit now.

So I obey, but it fails:

> $ jupyter-3.4 notebook
> jupyter: 'notebook' is not a Jupiter command


What?  What are the existing commands?

> $ jupyter-3.4 --help
> usage: jupyter-3.4 [-h] [--version] [--config-dir] [--data-dir]
>                    [--runtime-dir] [--paths] [--json]
>                    [subcommand]
> 
> Jupyter: Interactive Computing
> 
> positional arguments:
>   subcommand     the subcommand to launch
> 
> optional arguments:
>   -h, --help     show this help message and exit
>   --version      show the jupyter command's version and exit
>   --config-dir   show Jupyter config dir
>   --data-dir     show Jupyter data dir
>   --runtime-dir  show Jupyter runtime dir
>   --paths        show all Jupyter paths. Add --json for machine-readable
>                  format.
>   --json         output paths as machine-readable json
> 
> Available subcommands: 3.4 kernelspec-3.4 migrate-3.4 nbconvert-3.4
> nbextension-3.4 notebook-3.4 trust-3.4

Huh, I need that -3.4 extension :(

> $ jupyter-3.4 notebook-3.4
> [I 10:09:00.941 NotebookApp] The port 8888 is already in use, trying another random port.
> [I 10:09:00.942 NotebookApp] The port 8889 is already in use, trying another random port.


But that `ipython notebook` is inside a shell script that I
provide my users with.  So I need something portable.  Hence
the question is: what is the advertised way to know how the
`notebook` command is to be invoked?  Yeah, I can grep and
sed etc. the help message, but that’s really messy.  Besides,
how do I know what conventions are used on other platforms/distros?

That `notebook-3.4` instead of `notebook` is really an additional
complexity I would have liked not to have.

FWIW, IPython/Jupyter were installed via MacPorts.

Cheers!
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