changes not staged for commit solution

New understanding of checkout in git

1. Problems encountered?

When I was working on Git today, I wanted to roll back a certain branch, a certain file or class in the Linux environment. I found that many online commands roll back the entire folder at one time, which is different from windwos.In IDEA, we can directly use the graphical operation point git Rollback, but under linux, we need to type a rollback command. What is this command?
Goal: Revert this release.sh as a single file

The previous understanding of git checkout is that you can perform the following operations:

git checkout branch name # used to switch branchesgit checkout -b branch name # used to create a branch and switch

git checkout HEAD

The following is my understanding:

git actually maintains a series of historical records, each historical label is the id of a record, and different branches represent different pointers, pointing to a certain historical label, along that label, you can view all's history.HEAD is also a pointer, but we often point it to the same history record as the branch pointer, and the git checkout command is used to move the HEAD pointer.

To fix the problem:
git checkout HEAD [ filename ]
or git checkout - - [ filename ]
to undo all changes made to the workspace, so that all previousThere is no modification, use it with caution!