Split each TXT file contained in a directory into chunks of a maximum size (here 5k)

split.sh

#!/bin/bash
directory=INSERT INPUT DIRECTORY HERE
output=INSERT OUTPOUT DIRECTORY HERE
mkdir $output

find $directory -type f -name '*.txt' -exec basename {} \; | while read file;
do
	split -b 5k "$directory"/"$file" "$output"/"$file".
done