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22 lines
761 B
Markdown
22 lines
761 B
Markdown
# Determine The Hash Id For A Blob
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Git's `hash-object` command can be used to determine what hash id will be
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used by git when creating a blob in its internal file system.
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```bash
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$ echo 'Hello, world!' > hola
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$ git hash-object hola
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af5626b4a114abcb82d63db7c8082c3c4756e51b
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```
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When a commit happens, git will generate this digest (hash id) based on the
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contents of the file. The name and location of the file don't matter, just
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the contents. This is the magic of git. Anytime git needs to store a blob,
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it can quickly match against the hash id in order to avoid storing duplicate
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blobs.
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Try it on your own machine, you don't even need to initialize a git
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repository to use `git hash-object`.
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[source](http://ftp.newartisans.com/pub/git.from.bottom.up.pdf)
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