$ sudo npm install opn
$ sudo npm install -g opn

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

$ sudo npm update opn

Update package globally,

$ npm install -g opn

Git clone:

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

$ sudo  npm install -g ./opn

opn@5.1.0 /usr/lib/node_modules/opn

How to remove opn package :

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

$ sudo npm uninstall opn

Basic Information of opn NPM Package: