Rollback Versions

HEAD points to the current version is the version, therefore, Git allows us to shuttle between the versions of the history, use the command git reset --hard commit_id.

Before the shuttle, you can view commit history with git log, in order to determine which version to fall back.

To return to the future, with git reflog view the command history in order to determine what you want to return to a future version.

git reset -head version number (git log can be viewed)
 git push -f (mandatory submission)

Undo operation

Sometimes we just finished submitting several documents were missing did not add, or submit the information was wrong. At this point, you can run the command with the submitted try to resubmit --amend options:

$ git commit --amend

This command will scratch pad file submission. If you have not since the last submission to make any changes (for example, immediately after the last submission execute this command), then the snapshot will remain the same, but you just submit the modified information.

After starting the text editor, submit information before you can see. After editing save overwrites the original information submitted.

For example, after you submit discover some forgotten modify the temporary need, you can do this as follows:

$ git commit -m 'initial commit'
$ git add forgotten_file
$ git commit --amend

You will only have to submit a final - second submission will replace the results of the first submission.

Cancel the temporary file

You have modified two files and want to commit them as two separate changes, but they unexpectedly entered the git add * scratch them two. How to cancel a temporary storage only two in it? git status command prompts you:

$ git add *
$ git status
On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

    renamed:    README.md -> README
    modified:   CONTRIBUTING.md

In the "Changes to be committed" text directly below the prompt use git reset HEAD ... to cancel the staging. So, we can cancel the temporary CONTRIBUTING.md file:

$ git reset HEAD CONTRIBUTING.md
Unstaged changes after reset:
M	CONTRIBUTING.md
$ git status
On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

    renamed:    README.md -> README

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

    modified:   CONTRIBUTING.md

Undo changes to files

If you do not want to keep the changes to the file CONTRIBUTING.md how to do? How can you easily undo changes - to restore it to look like when the last commit (or just look like clones finished, or just put it in the way when working directory)? Luckily, git status tells you it should be. In the last example, the staging area is not so:

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

    modified:   CONTRIBUTING.md

It is very clear to the changes made before how you undo. Let's follow the prompts:

$ git checkout -- CONTRIBUTING.md
$ git status
On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

    renamed:    README.md -> README