Split CSV file according to number of lines and keep header

split_csv_header.sh

LINES=100
INPUT_FILE='PATH/TO/TEXT/CSV'

tail -n +2 $INPUT_FILE | split -l $LINES - prefix_

for file in prefix_*
do
    head -n 1 $INPUT_FILE > tmp_file
    cat $file >> tmp_file
    mv -f tmp_file $file
done