Slice a file into pieces and put it back together. Useful if you need to meet file size limits.
This code splits a file named 'largefile.zip' into pieces of size 1500M = 1.5GB.
It names these chunks 'largefile_chunk_aa', 'largefile_chunk_ab', and so on, and these are files of the specified size.
The very last chunk's size will be the remaining bits of the file after all other chunks are made.

Now, put it back together with 'cat' by feeding them into the command in the order the were generated.

Alternatively, you could automate the process of entering the files in the right order:

You should now have your original file back.

Specify which files to exclude when zipping a folder. Useful for removing hidden files or .DS_Stores on Mac.
This code creates a zip file of the directory 'folder_name' and names it 'folder_name.zip' while excluding any instances of .DS_Store in the zip.