mkfile

Create one or more empty files of any size. More information: https://ss64.com/osx/mkfile.html.

Create an empty file of 15 kilobytes:

mkfile -n {{15k}} {{filename}}

Create a file of a given size and unit (bytes, KB, MB, GB):

mkfile -n {{size}}{{b|k|m|g}} {{filename}}

Create two files of 4 megabytes each:

mkfile -n {{4m}} {{first_filename}} {{second_filename}}