Version Control with Git: Intermediate: Git Cheatsheets for Quick Reference

Key Points

Introduction to Git

  • Version control is like an unlimited ‘undo’.

  • Version control also allows many people to work in parallel.

  • git init initializes a repository.

  • Git stores all of its repository data in the .git directory.

  • git status shows the status of a repository.

  • Files can be stored in a project’s working directory (which users see), the staging area (where the next commit is being built up) and the local repository (where commits are permanently recorded).

  • git add puts files in the staging area.

  • git commit saves the staged content as a new commit in the local repository.
Collaborating

  • git clone copies a remote repository to create a local repository with a remote called origin automatically set up.
Conflicts

  • Conflicts occur when two or more people change the same lines of the same file.

  • The version control system does not allow people to overwrite each other’s changes blindly, but highlights conflicts so that they can be resolved.
Branches

  • git branch creates a branch.

  • git checkout allows you to switch between branches

  • git merge to merge branches
Forks and Pull Requests

  • Any public repository on GitHub can be forked and modified.

  • If you make changes to a forked repository, you can request that the maintainer of the original repository merges your changes into theirs.
Integrate Matlab and Git

  • MATLAB has built in features that will help you keep version control of your MATLAB scripts.
Resources to learn more

  • The more you use it the more you will learn

  • Build your community

Git Cheatsheets for Quick Reference

Glossary

changeset
A group of changes to one or more files that are or will be added to a single commit in a version control repository.
commit
To record the current state of a set of files (a changeset) in a version control repository. As a noun, the result of committing, i.e. a recorded changeset in a repository. If a commit contains changes to multiple files, all of the changes are recorded together.
conflict
A change made by one user of a version control system that is incompatible with changes made by other users. Helping users resolve conflicts is one of version control’s major tasks.
HTTP
The Hypertext Transfer Protocol used for sharing web pages and other data on the World Wide Web.
merge
(a repository): To reconcile two sets of changes to a repository.
protocol
A set of rules that define how one computer communicates with another. Common protocols on the Internet include HTTP and SSH.
remote
(of a repository) A version control repository connected to another, in such way that both can be kept in sync exchanging commits.
repository
A storage area where a version control system stores the full history of commits of a project and information about who changed what, when.
resolve
To eliminate the conflicts between two or more incompatible changes to a file or set of files being managed by a version control system.
revision
A synonym for commit.
SHA-1
SHA-1 hashes is what Git uses to compute identifiers, including for commits. To compute these, Git uses not only the actual change of a commit, but also its metadata (such as date, author, message), including the identifiers of all commits of preceding changes. This makes Git commit IDs virtually unique. I.e., the likelihood that two commits made independently, even of the same change, receive the same ID is exceedingly small.
SSH
The Secure Shell protocol used for secure communication between computers.
timestamp
A record of when a particular event occurred.
version control
A tool for managing changes to a set of files. Each set of changes creates a new commit of the files; the version control system allows users to recover old commits reliably, and helps manage conflicting changes made by different users.