syntax
$ swapon <option>

To enable all swap devices and files listed in the /etc/fstab

$ sudo swapon -a

$ sudo swapon -av

To enable swap device with device name

$ sudo swapon -a /dev/vda5

$ sudo swapon -av /dev/vda5

To display the swap usage summary of all enabled swap devices and files

$ sudo swapon -s

To enable the swap discards if the device supports the discard operation

$ sudo swapon -d

To reinitialize the swap space

$ sudo swapon -f

To display a summary table with selected columns

$ swapon --show=NAME,SIZE

To print the raw output format

$ sudo swapon --raw

regards,

T.Dhanasekar