SHELL

install angular cli

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

install angular cli version

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

installing latest angular cli

// install latest Angular CLI
npm install -g @angular/cli

// Genrerating a new application base
ng new my-application

// switching to the application directory
cd my-application

// running the application on local dev server
ng serve

instalación de angular cli

# Instalación de angular cli
npm install -g @angular/cli
# Instalación de la última versión
npm install -g @angular/cli@latest

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

Install the Angular CLI

npm install -g @angular/cli

ng new my-app

cd my-app
ng serve --open

install latest angular CLI

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

install angular cli

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

angular cli install

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