How to split a file and keep the first line in each of the pieces?

Question

Given: One big text-data file (e.g. CSV format) with a \'special\' first line (e.g., field names).

Wanted: An equivalent of the cor

Answer 1

I liked the awk version of marco, adopted from this a simplified one-liner where you can easily specify the split fraction as granular as you want:

awk 'NR==1{print $0 > FILENAME ".split1";  print $0 > FILENAME ".split2";} NR>1{if (NR % 10 > 5) print $0 >> FILENAME ".split1"; else print $0 >> FILENAME ".split2"}' file