Now that you've installed Node.js, we want to do two things—verify that the installation was successful, and familiarize you with the command-line tools.
The basic installation of Node.js includes two commands, node and npm. We've already seen the node command in action. It's used either for running command-line scripts or server processes. The other, npm, is a package manager for Node.js.
The easiest way to verify that your Node.js installation works is also the best way to get help with Node.js. Type the following command:
$ node --help Usage: node [options] [ -e script | script.js | - ] [arguments] node inspect script.js [arguments] Options: -v, --version print Node.js version -e, --eval script evaluate script -p, --print evaluate script and print result -c, --check syntax check script without executing -i, --interactive always enter the REPL even if stdin does not appear to be a terminal...