React native command not found

I am starting to install react native. I had successfully installed homebrew, nodejs , npm. but not able to install react native

First I had tried

npm install -g react-native-cli

gives me write warning:

Missing write access to /Users/project/.npm-packages/lib/node_modules/react-native-cli

After that I had tried

sudo npm install -g react-native-cli

/Users/project/.npm-packages/bin/react-native -> /Users/project/.npm-packages/lib/node_modules/react-native-cli/index.js/Users/project/.npm-packages/lib└── react-native-cli@1.0.0

Looks like install.

After that I tried

react-native init AwesomeProject

Error : react-native: command not found

What could be the problem