$ sudo npm install gulp-uglifyjs
$ sudo npm install -g gulp-uglifyjs

If want to update the gulp-uglifyjs package execute the command as below,

$ sudo npm update gulp-uglifyjs

Update package globally,

$ npm install -g gulp-uglifyjs

Git clone:

$ sudo  git clone https://github.com/rektide/gulp-uglifyjs.git

$ sudo  npm install -g ./gulp-uglifyjs

gulp-uglifyjs@0.6.2 /usr/lib/node_modules/gulp-uglifyjs

How to remove gulp-uglifyjs package :

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

$ sudo npm uninstall gulp-uglifyjs

Basic Information of gulp-uglifyjs NPM Package: