~/project_3D/cnc/cncjs$ cnc -v
Error: [SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode]
~/project_3D/cnc/cncjs$ cnc -h

  Usage: cnc [options]

  Options:

    -V, --version                       output the version number
    -p, --port <port>                   Set listen port (default: 8000) (default: 8000)
    -H, --host <host>                   Set listen address or hostname (default: 0.0.0.0) (default: 0.0.0.0)
    -b, --backlog <backlog>             Set listen backlog (default: 511) (default: 511)
    -c, --config <filename>             Set config file (default: ~/.cncrc)
    -v, --verbose                       Increase the verbosity level (-v, -vv, -vvv)
    -m, --mount <route-path>:<target>   Add a mount point for serving static files (default: )
    -w, --watch-directory <path>        Watch a directory for changes
    --access-token-lifetime <lifetime>  Access token lifetime in seconds or a time span string (default: 30d)
    --allow-remote-access               Allow remote access to the server (default: false)
    --controller <type>                 Specify CNC controller: Grbl|Marlin|Smoothie|TinyG|g2core (default: '') (default: )
    -h, --help                          output usage information

  Examples:

    $ cnc -vv
    $ cnc --mount /pendant:/home/pi/tinyweb
    $ cnc --mount /widget:~+/widget --mount /pendant:~/pendant
    $ cnc --mount /widget:https://cncjs.github.io/cncjs-widget-boilerplate/v1/
    $ cnc --watch-directory /home/pi/watch
    $ cnc --access-token-lifetime 60d  # e.g. 3600, 30m, 12h, 30d
    $ cnc --allow-remote-access
    $ cnc --controller Grbl

~/project_3D/cnc/cncjs$ cnc -V
1.9.20
~/project_3D/cnc/cncjs$ node -v
v4.9.1
~/project_3D/cnc/cncjs$ npm -v
2.15.11

git clone https://github.com/creationix/nvm.git ~/.nvm
cd ~/.nvm
git checkout `git describe --abbrev=0 --tags`
cd ..
chmod +x ~/.nvm/nvm.sh
. ~/.nvm/nvm.sh

# Add these lines to your ~/.bash_profile, ~/.bashrc, or ~/.profile file to have it automatically sourced upon login:
# export NVM_DIR="$HOME/.nvm"
# [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh" # This loads nvm

nvm install node

nvm install 4
nvm use 4

# npm install -g cncjs
npm install -g cncjs@latest --unsafe-perm