[Qemu-discuss] Difference between commit and rebase

[lampahome]

I want to remove snapshots and I found two ways:
qemu-img commit
qemu-img rebase

I found they both can choose which img to rebase(merge).

And I found some little difference like below:
commit can truncate or not on specific image.
rebase won't truncate rebased image.

I found they have something little similarity and I don't know what
situation is suitable for commit or rebase?
I don't know what situation is suitable to use commit or rebase.