Bash script for splitting large CSV files while keeping the header into 100 lines a piece using Split. Outputs as Part1, Part2, ... while keeping its Header

splitter.sh

#!/bin/bash
FILENAME=filename_here.csv
HDR=$(head -1 $FILENAME)
split -l 100 $FILENAME xyz
n=1
for f in xyz*
do
	if [ $n -gt 1 ]; then 
		echo $HDR > Part${n}.csv
	fi
	cat $f >> Part${n}.csv
	rm $f
	((n++))
done