I have a Python script that outputs a text file with thousands of random filenames in a comma separated list, all on a single row. I want to take each value in the list and put it into its own row in a new CSV file. I've tried some variations of awk with no success. What's the best way to

Split CSV values on single row into individual rows

I have a Python script that outputs a text file with thousands of random filenames in a comma separated list, all on a single row.

randomFileName1, randomFileName2, randomFileName3, etc.

I want to take each value in the list and put it into its own row in a new CSV file.

randomFileName1
randomFileName2
randomFileName3

I’ve tried some variations of awk with no success. What’s the best way to move these values into their own rows?

With GNU sed:

sed 's|, |n|g' file

Or, for a portable alternative,

sed 's|, |
|g' file