$ sudo npm install semaphore
$ sudo npm install -g semaphore

If want to update the semaphore package execute the command as below,

$ sudo npm update semaphore

Update package globally,

$ npm install -g semaphore

Git clone:

$ sudo  git clone https://github.com/rektide/semaphore.git

$ sudo  npm install -g ./semaphore

semaphore@1.1.0 /usr/lib/node_modules/semaphore

How to remove semaphore package :

You can uninstall or remove this package from your node_modules run the command as below,

$ sudo npm uninstall semaphore

Basic Information of semaphore NPM Package: