Answer by ashishk for split file into N pieces with same name but different target directories

#!/bin/bash

# assuming the file is in the same folder as the script
INPUT=large_file.txt
# assuming the folder called "output" is in the same folder
# as the script and there are folders that have the patter
# prog01 prog02 ... prog30
# create that with mkdir output/prog{01..30} 
OUTPUT_FOLDER=output

OUTPUT_FILE_FORMAT=myfile

# split 
# -n -> 30 files
# $OUTPUT_FILE_FORMAT -> should start with this pattern
# --numeric-suffixes=1 -> end of file name should start from 01 
split -n 30 $INPUT $OUTPUT_FILE_FORMAT --numeric-suffixes=1

# move all files to their repective directories
for i in {01..30} 
do
    mv $OUTPUT_FILE_FORMAT$i $OUTPUT_FOLDER/prog$i/myfile.txt
done

echo "done :)"

exit

The split command is more than enough for this task. However the solution here requires you to make your folder names start from prog01 and not prog1