tail is a program on Unix and Unix-like systems used to display the last few lines of a text file or piped data.
By default,tail will print the last 10 lines of its input to the standard output. With command line options the number of lines printed and the printing units (lines,blocks or bytes) may be changed. The following example shows the last 20 lines of filename: tail -n 20 filename

Explanation/Reference:
Explanation:
Oracle Solaris 11 uses Automated Installer (AI) for unattended installations.
Unattended installations are possible by placing the contents of the AI Image media (or ISO image contents from a download) on an AI server.

In the below output, NR (now running) means the BE is active now and will be the
active BE on reboot.
Example:
Display your existing BE information.
# beadm list
BE Active Mountpoint Space Policy Created
solaris NR / 12.24G static 2011-10-04 09:42

How to Recreate a ZFS Root Pool and Restore Root Pool Snapshots In this scenario,assume the following conditions:
*ZFS root pool cannot be recovered
*ZFS root pool snapshots are stored on a remote system and are shared over NFS
*The system is booted from an equivalent Solaris release to the root pool version so that the Solaris release and the pool version match. Otherwise,you will need to add the -o version=version-number property option and value when you recreate the root pool in step 4 below.
All steps below are performed on the local system.
1.Boot from CD/DVD or the network.
On a SPARC based system,select one of the following boot methods:
ok boot net -s ok boot cdrom -s If you don't use -s option,you'll need to exit the installation program.
2.Mount the remote snapshot dataset.
For example:
# mount -F nfs remote-system:/rpool/snaps /mnt
3.Recreate the root pool.
For example:
# zpool create -f -o failmode=continue -R /a -m legacy -o cachefile=/etc/zfs/zpool.cache rpool c1t0d0s0
4.Restore the root pool snapshots.
This step might take some time. For example:
# cat /mnt/rpool.0311 | zfs receive -Fdu rpool Using the -u option means that the restored archive is not mounted when the zfs receive operation completes.
5.Set the bootfs property on the root pool BE.
For example:
# zpool set bootfs=rpool/ROOT/osolBE rpool
6.Install the boot blocks on the new disk.
On a SPARC based system:
# installboot -F zfs /usr/platform/`uname -i`/lib/fs/zfs/bootblk /dev/rdsk/c1t0d0s0