Mark,
I am likely being thick, but I don't understand. The value of the column (not a column name) is what is being used as the file name. It is not possible to know in advance the values without going through every line of every file first. Even if you did that, you would still need to store the information in a hash so that you could look up the filehandle corresponding to that value later so I see this as a slower variation on my proposed solution. What am I missing?
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