Thanks for the detailed explanation Bryan. I've figured out how to use 
it now, but I'm still stuck on how to check for the latest file:

For instance,

some_file.2008-06-02.csv
some_file.2008-06-03.csv

Now I want to traverse the folder and open up the latter file. If it is 
a viable solution, is there a command that returns the most recent file 
with the name pattern "some_file.\d{4}-\d{2}-\d{2}.csv"

Thanks so much!
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