Puppet users - Apr 2014 - How to check a text file for a certain line?

Hi everyone, I'm pretty new to puppet, and I was wondering if you guys to 
help me with something pretty basic. I'm attempting to write a module that 
will check a text file for a certain line of text, and if it doesn't find 
it, to add a that content in a new line.

I'm pretty sure I can add the new line using exec to run echo
"content" >>
file.txt, but checking the file for said content has me completely stumped. 
What can I do here?

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