Can't install angular-cli on Mac

Question

This is probably very trivial, but I am hitting my head against the wall while I am trying to (unsuccessfully) install angular-cli.

I am following the official angul

Answer 1

These are the codes I used

sudo npm uninstall -g angular-cli
sudo npm uninstall -g @angular/cli
sudo npm cache clean --force
npm install -g @angular/cli
alias ng="~/node_modules/@angular/cli/bin/ng"

for check

ng --version