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Editorial Team
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Asked: 2026-06-16T03:16:34+00:00

At first initialize a repo containing a file named rose $: echo sweet >

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At first initialize a repo containing a file named rose

$: echo sweet > rose
$: git init
$: git add .
$: find .git/objects/ -type f
.git/objects/aa/823728ea7d592acc69b36875a482cdf3fd5c8d
$: git commit -m "rose"
$: find .git/objects/ -type f -printf "%h%f %s\n"
.git/objects/05b217bb859794d08bb9e4f7f04cbda4b207fbe9 49
.git/objects/aa823728ea7d592acc69b36875a482cdf3fd5c8d 21
.git/objects/665d02ccbacdde1c0f2eecde01fbf47144ddd492 124

Then I want to sha the blob and see how to generate tree-object’s id

echo -e "tree 21\0100644 rose\0aa823728ea7d592acc69b36875a482cdf3fd5c8d"|sha1sum

What it print is not 05b217bb859794d08bb9e4f7f04cbda4b207fbe9
Where am i wrong?

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1 Answer

  1. Editorial Team

    echo inserts a newline by default, unless you specify the -n (omit newline) flag.

    Also, the blob ID is not stored in ASCII format, but rather as binary value. This results in a object size of 32 (not 21).

    The following command will give you the correct output:

    echo -en 'tree 32\x00100644 rose\x00\xaa\x82\x37\x28\xea\x7d\x59\x2a\xcc\x69\xb3\x68\x75\xa4\x82\xcd\xf3\xfd\x5c\x8d' | sha1sum
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