in package.json,

"bin" : {
	"clidemo" : "./index.js"
}

in index.js

console.log("hello world");

"clidemo" is our custom command, when run it, "index.js" executed

i have published this simple demo on npm, so there are 2 ways to run demo

#1. create a module by yourself, then

run

npm install -g

you will install your own module (this one) into node-global

simple call

clidemo

output

hello world

#2. install this package to global from npm

run

npm install -g node-clidemo

run

clidemo

output on cli

hello world

awesome, it works ^^