Pretend that a modified file is unchanged (git status will not show this as changed)

Git command for manipulating the index.
More information: <https://git-scm.com/docs/git-update-index>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

git update-index --skip-worktree {{path/to/modified_file}}

click the source code to copy install git update-index on any operating system with command-not-found.com