The e2label command followed by a partition displays the current label of a partition. In this example, the /dev/sda1 partition does not have a label.

~]# e2label /dev/sda1

The e2label command followed by a partition and a label name adds or updates a label for a partition. In my this, the /dev/sda1 partition is labeled "root-partition".

~]# e2label /dev/sda1 root-partition

Now that /dev/sda1 has a label, the e2label command followed by the partition name displays the label of the partition.

~]# e2label /dev/sda1
root-partition