$ sudo npm install sha1
$ sudo npm install -g sha1

If want to update the sha1 package execute the command as below,

$ sudo npm update sha1

Update package globally,

$ npm install -g sha1

Git clone:

$ sudo  git clone https://github.com/rektide/sha1.git

$ sudo  npm install -g ./sha1

sha1@1.1.1 /usr/lib/node_modules/sha1

How to remove sha1 package :

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

$ sudo npm uninstall sha1

Basic Information of sha1 NPM Package: