Move all ZFS child datasets to a new parent dataset

move_zfs_child_datasets.bash

#!/bin/bash

# Move all ZFS child datasets to a new parent dataset
# See post about problematic Docker datasets:
# https://daveparrish.net/posts/2020-11-10-Managing-ZFS-Snapshots-ignore-Docker-snapshots.html

if [ ! $# -eq 2 ]; then
    echo "Please supply a source and destination ZFS dataset as the first and second parameter"
    echo "Example: ./move_zfs_child_datasets.bash zpool/ROOT/default zpool/docker"
    exit;
fi

currentDatasetPath=$1
newDatasetPath=$2

currentDatasets=$(zfs list -H -t filesystem -d 1 -o name "$currentDatasetPath" | tail +2)

for dataset in $currentDatasets ; do
    newDataset="$newDatasetPath/${dataset##*/}"
    echo "Move $dataset to $newDataset"
    sudo zfs rename "$dataset" "$newDataset"
done