Concept

• SCM: Software Configuration Management
• VCS: Version Control Systems

Version Control Systems are just that, software that provides versioning functionality (Git, Subversion, TFS Version Control) all fall into this category.

Software Configuration Management is a broader term that encompasses all the processes needed to build, package, and deploy software – this includes Version Control Systems. It does not refer to software per se.

• working directory / working tree

Unstaged changes exist in our Working Directory, but Git hasn’t recorded them into its version history yet.

• index/staged

• HEAD

a reference to the last commit in the currently checked-out branch.

git diff

git diff View difference between Stage and Working Directory git diff --staged View difference between HEAD and Stage --staged is a synonym of --cached git diff HEAD View difference between HEAD and Working Directory git diff commmit-1 commit-2 View difference between commmit-1 and commmit-2

Conclusion

links

git-scm What is the difference between git diff HEAD vs. git diff –staged? What’s the difference between VCS and SCM? How to list all the files in a commit? about-collaborative-development-models