▸ nanoc-select -h
usage: ./bin/nanoc-select version

Since nanoc 3.x is not backwards compatible with nanoc 2.x, it can be useful
to have multiple versions of nanoc installed simultaneously. In order to avoid
having to type `nanoc2` or `nanoc3`, the `nanoc-select` tool can be used to
make `nanoc` invoke either `nanoc2` or `nanoc3. In addition to this,
`nanoc-select` will alias the `Nanoc2` or `Nanoc3` namespaces as `Nanoc`.

Options:

    -h --help     show this help and exit
    -v --version  show version information and exit
    -l --list     list available versions and exit

▸ nanoc-select 3
Switched to nanoc version 3.

▸ nanoc --version
nanoc 3.0.5 (c) 2007-2009 Denis Defreyne.
Ruby 1.9.1 (2009-07-16) running on i386-darwin10.0.0

▸ nanoc-select 2
Switched to nanoc version 2.

▸ nanoc --version
Could not execute nanoc2, which is your selected nanoc version. Make sure that nanoc2 is installed and that it is in your $PATH.

* To install nanoc2, run `gem install nanoc2`.
* To select a different version of nanoc, run `nanoc-select`.

▸ nanoc-select 9001
There is no nanoc version 9001!

Available nanoc versions:

    2 -- nanoc 2.x
    3 -- nanoc 3.x

▸