Add change 05 instructions
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- cat-file: Print hashed objects
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This command is the "opposite" of `hash-object`: it can print an object by its
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OID. Its implementation just reads the file at ".ugit/objects/{OID}".
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The names `hash-object` and `cat-file` aren't the clearest of names, but they
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are the names that Git uses so we'll stick to them for consistency.
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We can now try the full cycle:
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```
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$ cd /tmp/new
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$ ugit init
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Initialized empty ugit repository in /tmp/new/.ugit
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$ echo some file > bla
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$ ugit hash-object bla
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0e08b5e8c10abc3e455b75286ba4a1fbd56e18a5
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$ ugit cat-file 0e08b5e8c10abc3e455b75286ba4a1fbd56e18a5
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some file
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```
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Note that the name of the file (bla) wasn't preserved as part of this process,
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because, again, the object database is just about storing bytes for later
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retrieval and it doesn't care which filename the bytes came from.
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