git.md

Git note

how to check diff between add and commit

how to check diff after adding before committing
addした後，commit前に差分を確認する方法

git diff --cached filename
or
git diff --cached .

how to cancel git add

git reset HEAD filename

how to git pull force

git fetch
git reset --hard origin/branch_name

# example
git fetch
git reset --hard origin/master

how to check diff between local and remote

how to check diff before pull.
After doing a git fetch, do a git log HEAD..origin/master to show the log entries between your last common commit and the origin's master branch. To show the diffs, use either git log -p HEAD..origin/master to show each patch, or git diff HEAD...origin/master (three dots not two) to show a single diff.

git fetch
git diff HEAD remote_name/branch_name # to show diff between local and remote
git log -p HEAD..remote_name/branch_name # to show log
git log HEAD...remote__name/branch_name # to show a single diff

# example
git fetch
git diff HEAD origin/master

• version control - How to preview git-pull without doing fetch? - Stack Overflow

how to check diff after commit

git diff HEAD^

how to check diff before pull

git diff remote_name/branch_name HEAD

# example
git diff origin/master HEAD

how to change commit message after commit

git commit --amend -m "commit message"

# example
git commit --amend -m "change commit message"

• Gitのコミットメッセージを後から変更する方法をわかりやすく書いてみた | 株式会社グランフェアズ

how to change commit message after push

If you want change last commit message, then you can do

# Change commit message
git commit --amend
or
git commit --amend -m "new message"

# Push it
git push --force-with-lease <repository> <branch>

# example
git commit --amend -m "change commit message"
git push --force-with-lease origin master

If the repository you want change commit message is not used by only you, you have to care about force push.
See reference Stack Overflow.

• Changing git commit message after push (given that no one pulled from remote) - Stack Overflow

How to download specific files from GitHub

I don't know if it works because I haven't try it...

git archive --remote=ssh://host/pathto/repo.git HEAD README.md

Just use curl or wget from Raw code page.

curl https://raw.githubusercontent.com/pytorch/examples/master/vae/main.py

• Ref
  • Retrieve a single file from a repository

Make empty branch

下記のコマンドで履歴のないブランチを作成する。

git checkout --orphan empty-branch

ファイルを削除して、

git rm -rf .

コミットして、

git commit --allow-empty -m "root commit"

push。

git push origin empty-branch

• Ref
  • Create empty branch on GitHub

Make ssh key for github

ssh-keygen -t rsa -b 4096 -C "[email protected]"

• Ref
  • 新しい SSH キーを生成して ssh-agent に追加する

複数SSH鍵を利用する

git config --local user.name "username"
git config --local user.email "[email protected]"

• Ref
  • 複数のgitアカウントを使い分ける
  • gitconfig の基本を理解する