swapon

Enables device or file for swapping. More information: https://manned.org/swapon.

Get swap information:

swapon -s

Enable a given swap partition:

swapon {{/dev/sdb7}}

Enable a given swap file:

swapon {{path/to/file}}

Enable all swap areas:

swapon -a

Enable swap by label of a device or file:

swapon -L {{swap1}}