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The request description is not clear, can you give us an example of your CSV file to explain your request? And are your expected result?
I have the following problem:
I would like to pull from. csv file named DB for a line that is called for example "foo", save it as a variable "foo" and report one output file.csv a vacuum that has the name as an extension of the field that have taken early so .... I would have pippo.csv
I hope I can be of help.