$ sudo npm install ethereumjs-testrpc
$ sudo npm install -g ethereumjs-testrpc

If want to update the ethereumjs-testrpc package execute the command as below,

$ sudo npm update ethereumjs-testrpc

Update package globally,

$ npm install -g ethereumjs-testrpc

Git clone:

$ sudo  git clone https://github.com/rektide/ethereumjs-testrpc.git

$ sudo  npm install -g ./ethereumjs-testrpc

ethereumjs-testrpc@6.0.3 /usr/lib/node_modules/ethereumjs-testrpc

How to remove ethereumjs-testrpc package :

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

$ sudo npm uninstall ethereumjs-testrpc

Basic Information of ethereumjs-testrpc NPM Package: