Make .gitignore ignore everything except a few files

Question

I understand that a .gitignore file cloaks specified files from Git\'s version control. I have a project (LaTeX) that generates lots of extra files (.auth, .dvi, .pdf, logs,

Answer 1

Nothing worked for me so far because I was trying to add one jar from lib.

This did not worked:

build/*
!build/libs/*
!build/libs/
!build/libs/myjarfile.jar 

This worked:

build/*
!build/libs