It's easy to add a few lines of text to files on Linux, but there are tools that make it easier to add many lines.

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 ...

You could even embed an executable file in a script — even another script — and then execute that script which might unpack another script. It boggles the mind.