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A tutorial introduction to git: part two

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A tree can refer to one or more "blob" objects, each corresponding to a file. In addition, a tree can also refer to other tree objects

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A "blob" is just file data

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the contents of these files is just the compressed data plus a header identifying their length and their type

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a blob, a tree, a commit, or a tag

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The "tree" object here refers to the new state of the tree:

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Besides blobs, trees, and commits, the only remaining type of object is a "tag"

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and refer to "parent"

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refer to "tree" objects

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represent the state of a single directory

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"blob" objects contain file data without any other structure.

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that lots of commands take a tree as an argument.

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The thing that it's comparing against is actually the index file

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.git/index

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between the working directory and the last commit

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between the index and the last commit

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git diff --cached

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-a option to commit tells it to first update the index with all changes in the working tree

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by default "git commit" uses the index to create the commit, not the working tree

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The effect of the "git add" was to add one entry to the index file

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