[CentOS] CentOS 6.6 Displays "return: Command not found" in Terminal

Hello,

Ever since I updated my x86_64 system from CentOS 6.5 to 6.6, I have when I
open a terminal, four lines of 'return: Command not found' diplayed. I'm at
a loss as to why this is, and was wondering if there is a command I can use
to find out what is causing it, and hopefully fix this issue.

Brian Bernard