I added a Run Script build phase to my Xcode project, the script is just
echo \"Hello\"
I\'m not seing hello in the debug console or anyth
Xcode: View > Navigators > Show Report Navigator
The Report Navigator is the "chat bubble" in the Xcode sidebar.
Select your most recent Build from the sidebar on the left.
Then click All Messages in the tab bar to see the output of your Run Script Build Phase.

Legacy Xcode Versions:
Xcode 6+View > Navigators > Show Report Navigator
Xcode 5: View > Navigators > Show Log Navigator
Xcode 4: View > Navigators > View Log Navigator