oh-my-git/levels/intro/git

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title = Enter the time machine
cards = init commit-auto checkout
[description]
Another month later, you're woking on an essay about tardigrades!
But this time, a friend has borrowed you a time machine!
It's called "Git", and it's very shiny.
[setup]
rm -rf .git
echo "~ Why tardigrades are cool ~
- They can survive in space.
- They are resistant to extreme heat and cold." > essay.txt
[win]
# Initialize the time machine!
test -d .git
# Make a snapshot of your essay (a "commit")
test -d .git && git rev-parse HEAD
# Add another line to the essay.
test "$(cat essay.txt | wc -l)" -ge 5
# And make a second commit!
git rev-parse HEAD^ && test "$(git show HEAD:essay.txt | wc -l)" -ge 5
[congrats]
Nice! You can now travel between those two snapshots using `git checkout` - try it, and look at the essay in each commit!
You can also make some additional commits. When you feel comfortable, click on "Next Level".