==== List the sizes and available space in all filesystems on ZFS appliance ====
  *  [[https://docs.oracle.com/cd/E51475_01/html/E52872/user_interface__cli__scripting__interacting_with_the_system.html#scrolltoc|ZFS Appliance scripting]]\\
Make sure to be in the root context before running this.
<code>
script
       run('shares');
       projects = list();

       printf('%-40s %-10s %-10s\
', 'SHARE', 'USED', 'AVAILABLE');

       for (i = 0; i < projects.length; i++) {
               run('select ' + projects[[i]]);
               shares = list();

               for (j = 0; j < shares.length; j++) {
                       run('select ' + shares[[j]]);

                       share = projects[[i]] + '/' + shares[[j]];
                       used = run('get space_data').split(/\\s+/)[[3]];
                       avail = run('get space_available').split(/\\s+/)[[3]];

                       printf('%-40s %-10s %-10s\
', share, used, avail);
                       run('cd ..');
               }

               run('cd ..');
       }
.
</code>
and the same information but "machine readable" sizes
<code>
script
fmt = '%-40s %-15s %-15s\
';
printf(fmt, 'SHARE', 'USED', 'AVAILABLE');
run('cd /');
run('shares');
pools = choices('pool');
for (p = 0; p < pools.length; p++) {
        set('pool', pools[[p]]);
        projects = list();
        for (i = 0; i < projects.length; i++) {
                run('select ' + projects[[i]]);
                shares = list();
                for (j = 0; j < shares.length; j++) {
                        run('select ' + shares[[j]]);
                        share = pools[[p]] + ':' + projects[[i]] + '/' + shares[[j]];
                        printf(fmt, share, get('space_data'),
                            get('space_available'));
                        run('cd ..');
                }
                run('cd ..');
        }
}
.
</code>
==== Create a pool ====
<code>
[[sudo]] zfs create datapool mirror /dev/sdc /dev/sdd
[[sudo]] zfs list
</code>
==== Create a ZFS filesystem / dataset in the pool ====
<code>
[[sudo]] zfs create datapool/scripts -o mountpoint=/scripts</code>
[[sudo]] zfs list -r datapool
==== Create a snapshot of the filesystem ====
<code>
[[sudo]] zfs snapshot datapool/scripts@snap1
[[sudo]] zfs list -t snapshot
</code>
==== Destroy a snapshot ====
<code>
[[sudo]] zfs destroy datapool/scripts@snap1
[[sudo]] zfs list -t snapshot
</code>
==== Rollback a snapshot ====
=== Create a file followed by a snapshot to preserve situation ===
<code>
[[sudo]] echo "hello" >/scripts/test1.txt
[[sudo]] cat /scripts/test1.txt
[[sudo]] zfs snapshot datapool/scripts@before
[[sudo]] zfs list -t snapshot
</code>
=== Change the contents of the file ===
<code>
[[sudo]] echo "goodbee" >/scripts/test1.txt
[[sudo]] cat /scripts/test1.txt
=== Rollback to previous snapshot and see original file contents ===
<code>
[[sudo]] zfs list -t snapshot
[[sudo]] zfs rollback datapool/scripts@before
[[sudo]] cat /scripts/test1.txt
[[sudo]] zfs list -t snapshot
</code>
==== Rename a snapshot ====
<code>
[[sudo]] zfs rename datapool/scripts@before datapool/scripts@after
[[sudo]] zfs list -t snapshot
</code>
==== Destroy a filesystem ====
<code>
[[sudo]] zfs destroy datapool/scripts
[[sudo]] zfs list -r datapool
</code>
If there are snapshots of the filesystem, add -r to force the destruction
<code>
[[sudo]] zfs destroy -r datapool/scripts
[[sudo]] zfs list -t snapshot
</code>
==== Create a clone ====
Clones can only be created from a snapshot.\\
Snapshots cannot be deleted unless the clone is deleted.\\
Clone the snapshot datapool/scripts@before
<code>
[[sudo]] zfs clone datapool/scripts@before datapool/clone1
zfs list
ls /datapool/clone1
</code>
=== Attempt to destroy underlying snapshot ===
<code>
</code>
=== Attempt to destroy underlying snapshot ===
<code>
[[sudo]] zfs destroy datapool/scripts@before
</code>
=== Destroy clone first ===
<code>
[[sudo]] zfs destroy datapool/clone1
</code>
=== Attempt to destroy underlying snapshot again ===
<code>
[[sudo]] zfs destroy datapool/scripts@before
</code>