I am used to run git rebase --autostash. For several reasons (conflict, edition, etc...) I may be interrupted during the rebase. I expect to see the autostashed content in the output of git stash list. But it is not. Where the temporary stash entry is located? How to see it?
While the rebase is going, the autostash is stored in : .git/rebase-merge/autostash.
Since this file is stored under .git/, and is a valid reference file, you can use rebase-merge/autostash as a name to point to the autostash :
git log --oneline --graph rebase-merge/autostash
# you can also use it with 'git stash show' or 'git stash apply' :
git stash show rebase-merge/autostash
git stash apply rebase-merge/autostash
You can also "insert" it in the regular stash by manually calling git update-ref refs/stash :
git update-ref -m "autostash" refs/stash rebase-merge/autostash
note : before reading your question I also thought the autostash was as a regular stash, I just found out about the tricks above by inspecting the content of .git/rebase-merge/.
The hacks above work at the moment (git version 2.31), I don't think you should count them as a rock solid, forever stable feature -- for example the internal structure of the .git/rebase-merge/ directory isn't part of the documentation.
and obviously, if you run git rebase from a terminal, you can also see the hash of the autostash in the command's output :
$ git rebase -i master
Created autostash: 2acfb51
...