Elementary practices

Version control

The following tasks are supported by GIT. A good book and a command reference are available online.

Creates a local repository for version control
```
git init
```
Adds content of the given files to the staging area
```
git add .
git add file1 file2 file3
```
Checks content status
```
git status
```
Compares content between working directory and staging area
```
git diff
git diff --ignore-all-space
```
Compares content between staging area and last commit
```
git diff --cached
git diff --staged
```
Commits content from staging area
```
git commit
```
Commits content from staging area, after adding automatically content of modified (old) files
```
git commit -a
```
Shows an overview of the changes in the history
```
git log --stat --summary
```
Shows complete diffs at each step of the changes in the history
```
git log -p
```
Shows a customized output of the changes in the history
```
git log --pretty=format:"%h - %an, %ar : %s"
```
Shows a graphical view of the changes in the history
```
gitk
```

Clones a remote repository

git clone remote-repo cloned-repo
git clone ssh-host:remote-repo cloned-repo

Updates and merges content from the remote repository
```
git pull
git pull origin master
```
Updates and merges content into the remote repository
```
git push
git push origin master
```
Shows configuration data of a local/cloned repository
```
git config -l
```
Lists all branches of a local/cloned repository
```
git branch
```
Lists all remotes of a local/cloned repository
```
git remote
```
Exports a local repository into a new bare server repository
```
git clone --bare my_project my_project.git
```
Generates info/refs and other auxiliary files in case of dumb server
```
git update-server-info
```

Applies design pattern Observer

void notify() {
  for (Observer observer : _observers) {
    observer.update();
  }
}