Split (by line) a file into similarly-sized parts each less than a given size

size-split.sh

#!/usr/bin/env bash

# Filesize limit (MiB)
limit=$(($1 * 1000**2))
shift

# Accept multiple files in the arguments
for file in $@
do
	# Skip arguments that aren't regular files
	if [ ! -f $file ]
	then
		echo Skipping	$file
		continue
	fi

	# File counts
	size=$(ls -l $file | awk '{ print $5 }')
	lines=$(wc -l $file | awk '{ print $1 }')
	parts=$((1 + $size/$limit))
	linelimit=$((1 + $lines/$parts))

	echo $file	$parts parts	$linelimit lines per part
	split -l $linelimit $file "$file."
done