Split CSV Files

split_csv.bash

#!/usr/bin/env bash

input_file=$1
header_file=./output/headers.csv
rows_file=./output/rows.csv

mkdir -p ./output

head -1 $input_file > $header_file
tail -n +2 $input_file > $rows_file

split -l 5000 $rows_file ./output/tmp_

index=1
for chunck_filename in ./output/tmp_*; do
    cat $header_file $chunck_filename > ./output/${index}.csv
    rm $chunck_filename
    let index=${index}+1
done

rm $header_file
rm $rows_file