Split a file into multiple chunk by lines count

gistfile1.txt

https://stackoverflow.com/questions/40509083/vim-split-one-file-into-multiple-files-based-on-row-count

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First, you define a control variable:

:let i = 1
Then, you write lines 1 to 99 (inclusive) to a file named after the current value of the control variable, cut those line, and increment the control variable;

:exec "1,99w! chunk-" . i|1,99d|let i = i + 1
Repeat as many times as needed:

49@:
This should give you 50 files named chunk-1 to chunk-50.

Since 5000 is not divisible by 99 you will be left with 50 lines. Write them to chunk-51:

:w chunk-51