Split a file into a number of equal parts

As an example, we have a file named primary_data_file.txt that contains 616 lines of data. We want to split this into 4 files, with the equal amount of lines in each.

The following command should do the trick:

The option -da generates the suffixes of length 1, as well as using numeric suffixes instead of alphabetical.

The results after running the command are the following files:

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