git add file that is in gitignore code example

Example 1: git add gitignore

$ touch .gitignore

Example 2: how to put files into gitignore

$ echo debug.log >> .gitignore
$ git rm --cached debug.log
rm 'debug.log'
$ git commit -m "Start ignoring debug.log"

Example 3: how to git ignore a file

git config --global core.excludesfile ~/.gitignore_global

Example 4: what is add.gitignore

The purpose of gitignore files is to ensure that certain files not tracked by git remain untracked.