There are many ways to append text to files on Linux, but to add a lot of lines, a script is likely one of your better options, especially if you need to do this repeatedly.

Do you want to create a Shell script in your Linux system? This guide will take you through how to create a shell script using multiple text editors, how to add comments, and how to use Shell ...

Choose a Bash or Python script if you need to perform a more complex substitution across multiple files or with additional logic. 6 Ways to Find and Replace Text in the Linux Terminal© Provided ...

That means if your script is careful to exit, you can add as much “garbage” to the end of it as you like. The shell will never look at it, so it’s possible to store the payload there.