swaplabel --version (return code: 0)
swaplabel from util-linux 2.27.1
swaplabel --help (return code: 0)
Usage:
swaplabel [options] <device>
Display or change the label or UUID of a swap area.
Options:
-L, --label <label> specify a new label
-U, --uuid <uuid> specify a new uuid
-h, --help display this help and exit
-V, --version output version information and exit
For more details see swaplabel(8).