Split file on basis of lines - like big csv file

split_lines.bash

#!/usr/bin/env bash

#cp ${1} ${1}-$(date +%s).bkp

lines=2 # indicate the number of lines each split should have
last_line=1
count=0
end=$(wc -l <${1})

while [[ ${last_line} -lt ${end} ]]; do
    tail -n +${last_line} $1 | head -n ${lines} > ${1}_split_${count}
    last_line=$((last_line+lines))
    count=$((count+1))
done

tail -n +${last_line} $1 > ${1}_split_${count}