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Version Control - A Brief Introduction to Git

CS480 Software Engineering

Yu Sun, Ph.D. http://yusun.io yusun@cpp.edu

Why Version Control?

Maintain Multiple Versions

• Safe backup

• Change version

Collaboration The problem to avoid

Collaboration The lock-modify-unlock solution

Collaboration The copy-modify-merge solution

Collaboration The copy-modify-merge solution

Monitor and Track Progress

Code Difference

Code Contribution

Why Git?

Why Git?

• Performance

• Github

• Popular

Git History

Why Command-Line?

Why Git Command-Line?

• GraphicalclientsarebasedonCLT

• Graphicalclientscouldcauseproblems

• Integratedwithshellscripts

• Graphicalclientsnotalwaysavailable

Git Exercises

1. Create Git Repositories

• gitclone<repo>

• gitinit<repo>

local repository

remote repository

local repository

local repository

2. Add/Commit/Push

• gitadd<path>

• gitcommit

• gitpush

working directory

staging area

local repository

remote repository

git add

git commit

git push

localremote

3. Check Status

• gitstatus

• gitlog

• gitbranch

4. Sync Changes & Resolve Conflicts

• gitpull--rebase(referredapproach)

• gitpull

• gitstatus

• //cleanupconflicts

• gitadd<conflictedfile>

• gitrebase--continue

• gitpush

local repository

remote repository

git pull --rebase

localremote

5. Branches

• gitcheckout-b<branch>

• gitcheckout<branch>

• gitmerge<branch>

Feature Branch

Master

6. Git Undo

• Alwaysbackupfirst

• GooglethesoluAon

Git Learning Resources

• http://git-scm.com/

• https://www.youtube.com/user/GitHubGuides

• Google it!

Git Basics Overview