Git cheat sheet

git-cheat-sheet.sh

## <...>: a mandatory parameter
## [...]: an optional parameter

# Compare two versions of a file
$ git diff HEAD^^ HEAD main.c
$ git diff HEAD~2 HEAD main.c

# Create a patch from a diff between two branches
$ git format-patch -n <master>..<develop>

# Squash some commits together
$ git rebase -i HEAD~3

# Format the last patch before sending it by email
$ git format-patch [--cover-letter] [--subject-prefix="PATCH v2"] HEAD^
$ git format-patch [--cover-letter] [--subject-prefix="PATCH v2"] HEAD~1

# Send patches by email
$ git send-email --to <email address> [--supress-cc=all] *.patch

# Checkout a remote branch
$ git checkout -b <new branch> origin/<remote branch>

# Get one-line commit messages for a range of commits
$ git log --oneline HEAD[^^]..HEAD

# Reverse a rebase
$ git reflog
$ git reset --hard HEAD@{<before the rebase>}

# Create a pull request for the last commit in the current branch,
# and send that pull request to maintainers or mailing list.
$ git request-pull <target repo/branch> <repo url> | mailx <email address> -s <message subject>
$ git request-pull origin/master git@...:project.git | mailx [email protected] -s "pull my patch, please"

# Diff a file in two different branches
$ git diff <branch 1> <branch 2> -- <file>

# List all tags
$ git tag -l

# Checkout from a given tag
$ git checkout -b <topic> tags/<tag name>

# Patch a file with a version of that file from another branch
$ git checkout --patch <branch> -- <file>

# Delete a remote branch
$ git push <remote> --delete <branch>

# Reset branch to origin/branch
$ git reset --hard origin/<branch>

# Revert merge from merge commit
$ git revert -m 1 <merge-commit>

# Cherry-pick multiple commits (A older than B, A included)
$ git cherry-pick A^..B

# Fixup commits (to fixup A)
$ git commit --fixup A
$ git rebase -i A --autosquash

# Editing the Author of Past Commits
$ git filter-branch --env-filter '
WRONG_EMAIL="[email protected]"
NEW_NAME="New Name Value"
NEW_EMAIL="[email protected]"

if [ "$GIT_COMMITTER_EMAIL" = "$WRONG_EMAIL" ]
then
    export GIT_COMMITTER_NAME="$NEW_NAME"
    export GIT_COMMITTER_EMAIL="$NEW_EMAIL"
fi
if [ "$GIT_AUTHOR_EMAIL" = "$WRONG_EMAIL" ]
then
    export GIT_AUTHOR_NAME="$NEW_NAME"
    export GIT_AUTHOR_EMAIL="$NEW_EMAIL"
fi
' --tag-name-filter cat -- --branches --tags