restore-s3-folder.sh

BUCKET_NAME=YOUR_BUCKKET_NAME
KEY_PREFIX="folder/to/restore"
# list all files having deleteMarker as latest version, you may use to confirm versionid.
aws s3api list-object-versions --bucket $BUCKET_NAME --prefix $KEY_PREFIX --query 'DeleteMarkers[?IsLatest==`true`]'

# this will actually restore all files by deleting delete marker from deleted files.
aws s3api list-object-versions  --bucket $BUCKET_NAME --prefix $KEY_PREFIX --output json --query 'DeleteMarkers[?IsLatest==`true`].[Key, VersionId]' | jq -r '.[] | "--key '\''" + .[0] + "'\'' --version-id " + .[1]' | xargs -L1 aws s3api delete-object --bucket $BUCKET_NAME