$ sudo npm install slack
$ sudo npm install -g slack

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

$ sudo npm update slack

Update package globally,

$ npm install -g slack

Git clone:

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

$ sudo  npm install -g ./slack

slack@9.0.9 /usr/lib/node_modules/slack

How to remove slack package :

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

$ sudo npm uninstall slack

Basic Information of slack NPM Package: