Accept input via stdin and arguments in a command line application in node.js

read_arguments.js

#!/usr/bin/env node

var args = process.argv.slice(2);
var input = args[0];

var isTTY = process.stdin.isTTY;
var stdin = process.stdin;
var stdout = process.stdout;

// If no STDIN and no arguments, display usage message
if (isTTY && args.length === 0) {
    console.log("Usage: ");
}
// If no STDIN but arguments given
else if (isTTY && args.length !== 0) {
    handleShellArguments();
} 
// read from STDIN
else {
    handlePipedContent();
}

function handlePipedContent() {
    var data = '';
    
    stdin.on('readable', function() {
        var chuck = stdin.read();
        if(chuck !== null){
            data += chuck;
        }
    });
    stdin.on('end', function() {
        stdout.write(uppercase(data));
    });

}

function handleShellArguments(){
    console.log(uppercase(input));
}

function uppercase(data){
    return data.toUpperCase();
}

usage.txt

$ echo bob | node read_arguments.js
BOB

$ node read_arguments.js bob
BOB

$ node read_arguments.js
Usage: filename <input>

What about both input from the command line as well as piped input?
(e.g. $ echo bob | node app.js -f, where -f is some optional parameter for app.js)

What about both input from the command line as well as piped input?
(e.g. $ echo bob | node app.js -f, where -f is some optional parameter for app.js)

Yeah, how would I do this?