Good Resources

The Podfile

An example podfile with the ios target platform and one library version number specified and another library version not specified:

platform :ios, '5.1'
pod 'BlocksKit',      '~> 1.8.3'
pod 'Reachability'


Updating The Pods Controlled Libraries

Run Applications > Utilities > Terminal

Navigate to your projects directory.  E.g. right click a file in your project and select Get Info, then copy the path and use

cd  /User/MYname/........

Then type

pod install
An example install process

Adams-Mac:Pererro Adam$ pod install
Analyzing dependencies
Downloading dependencies
Installing BlocksKit (1.8.3)
Installing Reachability (3.0.0)
Using libffi (3.0.13)
Generating Pods project
Integrating client project
Adams-Mac:Pererro Adam$