Gary Kuhlmann - July 5, 2015
This is the command to use to check if a partition has a label. Note: If the partition does not have a filesystem already this will error.
e2label [partition path]
This is the command to assign a new label to a partition.
e2label [partition path] [label name]
Here is the line to use in you /etc/fstab file to mount the partition by label.
LABEL=[label name] [mount directory] [filesystem type. ex: ext4] defaults 0 0