Replace lines in a file

[Seeds]

I have my code create and load a save file. The save file is simply a bunch of variables saved per line. Now I want the user to be able to save/replace about 15 specific variables to that file when the user presses save (While leaving the rest of the lines in the file intact). I figured since FileReadLine,,, was a thing there'd be an opposite FileReplaceLine, but it doesn't appear so easy.
Thanks.

[gregster]

Thought about using an ini-file: IniRead, IniWrite ?

[mast4rwang]

you can easily write your own replaceLine function