Getting a list of all children of a given commit

by

Show the ancestry paths to commit A from a set of others:

git log--ancestry-path^Aothers

Show all the unreachable commits in the repo:

git fsck --unreachable --no-reflogs \
| awk '$2 == "commit" {print $3}'

Trace all descendants of commit A anywhere in the repo:

git log --ancestry-path --graph --decorate --oneline ^A \
   --all $(git fsck --unreachable --no-reflogs | awk '$2=="commit" {print $3}')

Git has since this answer was written learned an easier way to show all references whose history includes a commit:

git for-each-ref --contains A

to which you can add --format="%(refname:short)" to clean up the output.

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