Install angular cli

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

Source: cli.angular.io

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

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

npm install -g @angular/cli@6.1.1

Source: npmjs.com

Please take the following steps to avoid issues:
"npm install --save-dev @angular/cli@latest"

Source: syntaxfix.com

npm i -g @angular/cli
ng new <app-name>
cd <app-name>
ng serve

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