Starting a new project

Set who am I

git config --global user.name "Changho Hwang"
git config --global user.email "[email protected]"

Make the first commit of the project

cd project_folder
git init
git remote add origin https://gitlab.com/chhwang/project.git
git add first_file_to_commit
git commit
git push -u origin master

Developing the project

Change repository URL

git remote set-url origin https://gitlab.com/chhwang/new_project.git

Discard all local changes and local commits, go back to a specific remote commit

git reset --hard 0d1d7fc32

Merge currently staged changes to the latest local commit

git commit --amend

Force to change the remote branch to be the same as the local one (be very careful)

git push -f

Push a local branch to a new remote branch

git push origin branch:new_branch

Delete a remote branch

git push origin --delete branch

Revert the latest local commit

git revert HEAD

Discard all local changes and commits and synch with the remote

git fetch
git reset --hard
git pull origin branch_name

Temporarily go back to an old commit

git checkout 0d1d7fc32

Checkout only one file

git fetch
git checkout 0d1d7fc32 -- file_to_checkout

Merge branches as one of them

git checkout better_branch
git merge -s ours another_branch
git checkout another_branch
git merge better_branch

Delete remote branch

git push origin --delete branch_name

Checking logs

Pretty log with graph

git log --pretty=format:"%h %s" --graph

Using grep

git log --grep="blahblah"

Print log stat

git log --stat

Managing the repository

List files in repository history

git rev-list --objects --all | git cat-file --batch-check='%(objecttype) %(objectname) %(objectsize) %(rest)' | awk '/^blob/ {print substr($0,6)}' | sort --numeric-sort --key=2 | cut --complement --characters=8-40 | numfmt --field=2 --to=iec-i --suffix=B --padding=7 --round=nearest

Figure out which commit modified a file

git log --pretty=oneline --all -- file_path

Clean a file from history

git filter-branch --tag-name-filter cat --index-filter 'git rm -r --cached --ignore-unmatch filename' --prune-empty -f -- --all

Reclaim local disk space

rm -rf .git/refs/original/
git reflog expire --expire=now --all
git gc --prune=now
git gc --aggressive --prune=now

Push cleaned repository

git push origin --force --all
git push origin --force --tags