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Display disk drives
sysctl hw.disknames


Changes to sysctl go in /etc/sysctl.conf.

Once your changes are made, you can reload from all the system files:

sysctl --system

To display all sysctl settings:

sysctl -a

You can set a value directly as well:

sysctl -w net.ipv4.ip_forward=1


In Linux, set the percentage to 10 in /etc/sysctl.conf:

vm.swappiness = 10

See also the Wikipedia article for a reference.