Add all files to a commit except a single file?

Question

I have a bunch of files in a changeset, but I want to specifically ignore a single modified file. Looks like this after git status:

# modified:          


        

Answer 1

To keep the change in file but not to commit I did this

git add .

git reset -- main/dontcheckmein.txt

git commit -m "commit message"

to verify the file is excluded do

git status