expand-file-by-null-bytes

Script to expand a target file by appending NULL bytes to it until it reaches the desired given size in bytes.

Usage

I created a say-fuck executable in C which outputs fuck

% ./say-fuck
fuck

The current size of the file is 16704 bytes

% stat say-fuck | grep -i size | cut -d " " -f 4
16704

I want my file to have a size of 17000 bytes so I run the script

% python3 expand-file-by-null-bytes.py "./say-fuck" 17000
expanding file by 296 bytes

Check the new size of the file

% stat say-fuck | grep -i size | cut -d " " -f 4
17000

Great! Now does it still run correctly?

% ./say-fuck
fuck

Yep. Cool.