how to delete a file from a local commit code example

Example 1: remove a file from git commit

git reset --soft HEAD^ 
or
git reset --soft HEAD~1
git reset HEAD path/to/unwanted_file
git commit -c ORIG_HEAD

Example 2: git remove file from commit

git filter-branch --index-filter "git rm -rf --cached --ignore-unmatch path_to_file" HEAD