Splits a file into chunks of a defined size and rebuilds it
usage: split_file.py [-h] -f FILENAME [-s SIZE] -m {s,b}
split file into specified size chuncks or rebuild
optional arguments:
-h, --help show this help message and exit
-f FILENAME filename to split or directory to rebuild
-s SIZE specify size of each chunk, defualt is 25MB
-m {s,b} select mode 'b' to build, 's' to split
-o OUT_DIR specify an output directory