Find all the direct descendants of a given commit [duplicate]

Question

How can I find all the commits that have a given commit as parent?

For instance, if I have this Git commit graph,

   G   H   I   J
    \ /     \ /
     D   E   F
      \  |  / \
       \ | /   |
        \|/    |
         B     C
          \   /
           \ /
            A

I'd like to get a list of all the direct descendants of B : D, E and F.

Womble

you are looking for "child commits", not siblings... D is a child of B, but a sibling of E – Cliff

You're absolutely right, english is not my native langage and I mixed up the words. That explains why Google could not help me with this question :D – Womble

you're welcome. FYI: sibling means "brother or sister" – Cliff

Answer 1

You can use git rev-list --parents and filter the children of a parent with grep and awk

git rev-list --all --parents | grep "^.\{40\}.*<PARENT_SHA1>.*" | awk '{print $1}'

Replace <PARENT_SHA1> with the sha-1 hash of your B commit.

EDIT

Any time you pipe grep | awk like this, consider just using AWK alone: awk '/<PARENT_SHA1>$/ { print $1 }' should do it, for example. I would go so far as to say this is a "Useless Use of Grep", much like "Useless Use of Cat".

Thanks shadowtalker. Here is the command line that works using just awk:

 git rev-list --all --parents | awk '$0 ~ /^.{40}.*<PARENT_SHA1>.*/ {print $1}'

It's a bit shorter and one less process for the shell.

Reformism

Why not use single quotes for the middle part and save the backslashes for escaping the curly braces? Easier to read, even shorter and somewhat "safer" when being extended. – Convection

@DanielBöhmer #26783719 – Malamute

Oh, thank you very much for enlightening me! I had actually expected that bash would handle curly braces specially even inside double quotes. – Convection

Any time you pipe grep | awk like this, consider just using AWK alone: awk '/<PARENT_SHA1>$/ { print $1 }' should do it, for example. I would go so far as to say this is a "Useless Use of Grep", much like "Useless Use of Cat". – Cunnilingus