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65 lines
1.4 KiB
Text
65 lines
1.4 KiB
Text
title = Make parallel commits
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cards = checkout commit-auto
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[description]
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Did you know that creating parallel timelines is perfectly legal and safe? It's true!
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Can you find out when things went wrong in this zoo? Then, go back to the last good commit and create a parallel universe where everyone is happy!
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[cli]
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The blue animal represents a concept known as the "HEAD pointer" in Git: It shows you which commit is the current one.
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Here's a cool trick to go to the previous commit:
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git checkout HEAD^
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You can also go back two commits by typing, for example:
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git checkout HEAD~2
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[setup]
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mkdir cage
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echo "Looks very hungry." > cage/lion
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echo "A small child.
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It really loves cats!" > child
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git add .
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git commit -m "The beginning"
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echo "It's holding a lollipop." >> child
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git commit -am "The child buys something"
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mv child cage
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git add .
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git commit -m "The child climbs somewhere"
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git rm cage/child
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echo "Looks happy. :)" > cage/lion
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git add .
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git commit -m "Oh no"
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echo "It's sleeping." > cage/lion
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git add .
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git commit -m "Nap time!"
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git checkout --detach
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git branch -d main
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[win]
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# Make sure that the child is happy.
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git ls-tree --name-only -r HEAD | grep child
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# Make sure that the lion gets something to eat.
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git show HEAD:cage/lion | grep -v "very hungry"
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[congrats]
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Whew, good job! This seems like a *much* better outcome.
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Feel free to add more parallel timelines, or make them longer.
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If you're ready, our next mission is already waiting...
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