install node.js on ubuntu

installNodejs.sh

#!/bin/bash
NODE=$1
NVMDIR=$2

NVM=$NVMDIR/nvm.sh

echo "installing node.js $1"
hash nvm 2>&- || { 
    echo "couldn't find nvm, checking for $NVM"
    test -e $NVM || {
        echo "couldn't find $NVM -> installing via git..."
        hash git 2>&- || {
            echo "couldn't find git -> installing git..."
            sudo apt-get -y install git-core || exit 1
        }
        git clone git://github.com/creationix/nvm.git $NVMDIR || exit 1
    }
    . $NVM
}
test -e $NVMDIR/$NODE || {
    echo "cound't find $NVMDIR/$NODE -> installing..."
    sudo apt-get -y install g++ curl libssl-dev apache2-utils || exit 1
    nvm install $NODE || exit 1
}