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document updated 12 years ago, on Feb 29, 2012

It is possible to lose track of some versions. In other cases, the versions just seem to disappear, but really are just temporarily out of view.

Ways to view these:

gitk --all

git log --walk-reflogs

gitk --all $( git log --walk-reflogs --format='%H' )

gitk --all $( git rev-list --all --walk-reflogs )

git fsck --unreachable

That's not all... there are several other instances where you can revive seemingly lost versions, to the point that some people suggest that git never lets you truly lose anything. [2] [3]

undoing a rebase [1]