Ποιος είναι ο σκοπός ενός συστήματος ελέγχου εκδόσεων;

Version control system (VCS) is necessary for tracking changes in code and other project files throughout its lifecycle. It provides the following advantages:

• Change history: Every change is saved, allowing you to see who, when, and what was changed. This helps understand the evolution of the project and identify the causes of errors.
• Rollback capability: It is easy to revert to any previous version of the project if the current version contains defects or does not meet requirements.
• Parallel development: Multiple developers can work on the same project simultaneously without overwriting each other's work. VCS helps manage merging changes.
• Branching: Allows creating separate branches for implementing new features, fixing bugs, or experimenting, isolating them from the main code until they are ready for integration.
• Backup: The VCS repository serves as a backup of the project.

Example of working with Git (distributed VCS):

# Initialize repository
git init

# Add files for tracking
git add index.html style.css

# Create a commit with changes
git commit -m "Initial commit of basic structure"

# Create a new branch for feature development
git branch feature/add-user-auth

# Switch to the new branch
git checkout feature/add-user-auth

# (Work on code)

# Merge branch with master after completing work
git checkout master
git merge feature/add-user-auth

Examples of version control systems:

Type	Examples	Description
Centralized	Subversion (SVN)	Single repository on a server.
Distributed	Git, Mercurial (Hg)	Each developer has a full copy of the repository.

Overall, VCS is an indispensable tool for efficient collaborative development, increasing project stability, and simplifying change management.