npm i @angular/cli code example

Example 1: install angular cli

npm install -g @angular/cli
ng new my-dream-app
cd my-dream-app
ng serve

Example 2: angular install

npm install -g @angular/cli

Example 3: install angular cli

npm install -g @angular/cli    //make sure you have node/npm installed 
ng new <appname>        //  eg:  ng new my-app
cd <appname>       // cd my-app
ng serve

Example 4: install angular cli version

Install Specific Version (Example: 6.1.1)
npm install -g @angular/cli@6.1.1