One of the common scenario of using Git is to make fixes to a repo A not belonging to me but I have already customized the source in the repo for my personal usage before hand. In this case, I can make a new branch called patch-1, for example, in my personal repo just for the fix:
git remote add A <url of A> git fetch A git checkout -b patch-1 A/patch-1
Once I commit all necessary fixes, I can make a pull request through the web interface of the Git repository. After the PR is merged, I can then delete the patch-1 branch remotely and locally by
git push origin --delete patch-1 git branch -d patch-1
If we just want to make a quick fix and then push it back right away, there is another way by calling the remote url directly without adding it:
git fetch https://github.com/theirusername/reponame.git theirbranch:ournameforbranch
ournameforbranch should be the target branch haven’t been created. Then
git checkout FETCH_HEAD to make changes in the new branch. Once things are done,
git push https://github.com/theirusername/reponame.git HEAD:theirbranch
If working in detached state worries you, by all means create a branch using
:ournameforbranch and replace
HEAD above with
Remove a file stored in Git history: If the change is not published yet, use
git rm --cached FILENAME git commit --amend -CHEAD
or remove the file and then redo the commits in the past 7 commits in the
git filter-branch --prune-empty -d /dev/shm/scratch --index-filter "git rm --cached -f --ignore-unmatch FILEPATH" --tag-name-filter cat -- HEAD~7..HEAD git update-ref -d refs/original/refs/heads/dev git reflog expire --expire=now --all git gc --prune=now
In the commands above,
-d names a temporary directory that does not yet exist to use for building the filtered history. If you are running on a modern Linux distribution, specifying a tree in
/dev/shm will result in faster execution. Without this
-d option, it might end up with a large backup blob in the directory after all the operations.
If the error
/refs/original/ backup has exist pops up, use
rm -r .git/refs/original/
to delete the backup first.
To compress loose objects, use
git gc --aggressive
git diff --color-words [<path> ...] can highlight the changes of a file or tree since the last commit in color to the word-level. As
git diff is not merely comparing indices,
git diff --no-index <path1> <path2> can compare two files without
git history and highlight the changes in color. The last command can also go with the
--color-words switch to show the word differences.
To reset a local repository to be synchronized with the remote, use
git fetch origin git reset --hard origin/master
Remove a submodule from a Git repository:
git add .gitmodules
git rm --cached path_to_submodule(no trailing slash).
rm -rf .git/modules/path_to_submodule
git commit -m "Removed submodule <name>"
rm -rf path_to_submodule
Ref: this one.