Commands to Check Ionic, Cordova and Plugin Version

Cordova

see installed version	cordova -v or cordova --version
see the latest version available	npm info cordova
to upgrade to latest version	npm update -g cordova -g means install globally otherwise need to uninstall and reinstall npm uninstall -g cordova npm install -g cordova

Ionic CLI

installed version	ionic -v or ionic --version
latest version available	npm info ionic
to upgrade to latest version	npm update -g ionic -g means install globally otherwise need to uninstall and reinstall npm uninstall -g ionic npm install -g ionic

Plugin of an Cordova app

installed version	npm list thePluginName
latest version available	npm info thePluginName
to upgrade to latest version	npm update thePluginName otherwise need to uninstall and reinstall or you can try to use cordova-check-plugins plugin
to add to project	cordova plugin add thePluginName or ionic cordova plugin add thePluginName
to remove from project	cordova plugin remove thePluginName or ionic cordova plugin remove thePluginName

You can also use

ionic info

command in an App directory to check Ionic CLI, Ionic Framework, Cordova CLI, Platforms, Plugins installed and other information.