$ sudo npm -g install yo
/opt/node-v4.2.3-linux-x64/bin/yo -> /opt/node-v4.2.3-linux-x64/lib/node_modules/yo/lib/cli.js

> yo@1.5.0 postinstall /opt/node-v4.2.3-linux-x64/lib/node_modules/yo
> yodoctor


Yeoman Doctor
Running sanity checks on your system

✔ Global configuration file is valid
✔ NODE_PATH matches the npm root
✔ Node.js version
✔ No .bowerrc file in home directory
✔ No .yo-rc.json file in home directory
✔ npm version

Everything looks all right!
- npmconf node_modules/yo/node_modules/fullname/node_modules/npmconf
- os-name node_modules/yo/node_modules/insight/node_modules/os-name
- win-release node_modules/yo/node_modules/insight/node_modules/os-name/node_modules/win-release
- request node_modules/yo/node_modules/insight/node_modules/request
- http-signature node_modules/yo/node_modules/insight/node_modules/request/node_modules/http-signature
- normalize-package-data node_modules/yo/node_modules/meow/node_modules/normalize-package-data
- redent node_modules/yo/node_modules/meow/node_modules/redent
- registry-url node_modules/yo/node_modules/npm-keyword/node_modules/registry-url
- rc node_modules/yo/node_modules/npm-keyword/node_modules/registry-url/node_modules/rc
- rc node_modules/yo/node_modules/package-json/node_modules/rc
- read-pkg node_modules/yo/node_modules/read-pkg-up/node_modules/read-pkg
- normalize-package-data node_modules/yo/node_modules/read-pkg-up/node_modules/read-pkg/node_modules/normalize-package-data
- latest-version node_modules/yo/node_modules/update-notifier/node_modules/latest-version
- package-json node_modules/yo/node_modules/update-notifier/node_modules/latest-version/node_modules/package-json
- registry-url node_modules/yo/node_modules/update-notifier/node_modules/latest-version/node_modules/package-json/node_modules/registry-url
- rc node_modules/yo/node_modules/update-notifier/node_modules/latest-version/node_modules/package-json/node_modules/registry-url/node_modules/rc
- semver-diff node_modules/yo/node_modules/update-notifier/node_modules/semver-diff
- bin-version-check node_modules/yo/node_modules/yeoman-doctor/node_modules/bin-version-check
- bin-version node_modules/yo/node_modules/yeoman-doctor/node_modules/bin-version-check/node_modules/bin-version
- semver-truncate node_modules/yo/node_modules/yeoman-doctor/node_modules/bin-version-check/node_modules/semver-truncate
/opt/node-v4.2.3-linux-x64/lib
`-- yo@1.5.0
  `-- yeoman-environment@1.4.0
    `-- globby@4.0.0
      `-- glob@6.0.2

vagrant@precise64:/vagrant$ yo -v
yo: command not found
vagrant@precise64:/vagrant$