Alice: basic branching

Reading the chapter again, Alice understands she has to enhance the vocabulary of the descriptions. But she also wants to keep developing the story, separating both tasks.

Lab

git status
git branch                          # show branches
git b█████ vocabulary-chapter-01    # create new branch
git status
git branch                          # show branches
git c███████ vocabulary-chapter-01  # move HEAD to the new branch
git status
git branch                          # show branches

git status
git branch
git branch vocabulary-chapter-01
git status
git branch
git checkout vocabulary-chapter-01
git status
git branch

• Our artist wants to check where HEAD is pointing to:

cat .git/HEAD
cat .git/refs/heads/vocabulary-chapter-01  # It contains the same value than main!
cat .git/refs/heads/main

• Alice will replace one of the appearance of the word beach with the much more beautiful sand

cat chapter-01.md | grep beach
sed -z -i 's/beach/sand/2' chapter-01.md
cat chapter-01.md | grep -e sand -e beach -e shore -e border
git add chapter-01.md
git commit -m "Replacing repetitive words"
git log

• Probably she will also change other words, but right now she wants to modify an important point of the story. So she moves HEAD to the main branch

git checkout main
cat chapter-01.md | grep -e sand -e beach # No sand, here
git log

• The saviour of Tim has actually an interesting profession, much more evocative than a simple kind stranger

sed -i 's/a kind stranger/the lighthouse keeper/' chapter-01.md
cat chapter-01.md
git add chapter-01.md
git commit -m "Introducing the lighthouse keeper"
git log

Questions

• Why, just after creating the new branch, main and vocabulary-chapter-01 had the same SHA-1 value?

Diagrams