> 
> For GNU/Linux, how do you turn swap off and how do you turn in back on again?
> 

Here is the top of the manual page:


NAME
       swapon, swapoff - enable/disable devices and files for paging and swap-
       ping

SYNOPSIS
       /sbin/swapon [-h -V]
       /sbin/swapon -a [-v] [-e]
       /sbin/swapon [-v] [-p priority]  specialfile ...
       /sbin/swapon [-s]
       /sbin/swapoff [-h -V]
       /sbin/swapoff -a
       /sbin/swapoff specialfile ...