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git add - Git add only all new files, not modified files - Stack Overflow

Is there a way to only add new files and not add modified files with git? That is, files that are listed as untracked with git status. Other than ofcourse adding each file separately. It's not 

git add $(git ls-files -o --exclude-standard)

.gitconfig

[alias]
  addnewonly = "!f() { git add $(git ls-files -o --exclude-standard); }; f"