owner@owner86-laptop:~$ swapon -a
owner@owner86-laptop:~$ sudo swapon -a
[sudo] password for owner: 
owner@owner86-laptop:~$ swapoff -a
swapoff: Not superuser.
owner@owner86-laptop:~$ sudo swapon -a
owner@owner86-laptop:~$ sudo swapoff -a
owner@owner86-laptop:~$ free -m
             total       used       free     shared    buffers     cached
Mem:           993        363        629          0         30        190
-/+ buffers/cache:        142        850
Swap:            0          0          0
owner@owner86-laptop:~$ sudo swapon -a
owner@owner86-laptop:~$ free -m
             total       used       free     shared    buffers     cached
Mem:           993        363        629          0         30        190
-/+ buffers/cache:        142        850
Swap:          336          0        336
owner@owner86-laptop:~$