swaplabel [-L label] [-U UUID] device
swaplabel will display or change the label or UUID of a swap partition located on device (or regular file).
If the optional arguments -L and -U are not given, swaplabel will simply display the current swap-area label and UUID of device.
If an optional argument is present, then swaplabel will change the appropriate value on device. These values can also be set during swap creation using mkswap(8). The swaplabel utility allows to change the label or UUID on an actively used swap device.
swaplabel was written by Jason Borden <email@example.com> and Karel Zak <firstname.lastname@example.org>.
The swaplabel command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
mkswap(8), swapon(8), uuidgen(1)