Bash script for dividing emails.txt into separate .csv files for each 2000 email addresses

email_divider.sh

line_count=$(cat emails.txt | wc -l)
file_count=0

while [ $file_count -lt $line_count ]
do
  echo "creating file emails_$file_count.csv"
  tail -n+$file_count emails.txt | head -n2000 >> emails_$file_count.csv
  file_count=$[$file_count+2000]
done