kazulog@sv1:~$ sudo sysctl --system 2>&1 | head -14
* Applying /usr/lib/sysctl.d/10-apparmor.conf ...
* Applying /usr/lib/sysctl.d/10-coredump-debian.conf ...
* Applying /usr/lib/sysctl.d/50-default.conf ...
* Applying /usr/lib/sysctl.d/50-pid-max.conf ...
* Applying /usr/lib/sysctl.d/55-bufferbloat.conf ...
* Applying /usr/lib/sysctl.d/55-console-messages.conf ...
* Applying /usr/lib/sysctl.d/55-ipv6-privacy.conf ...
* Applying /usr/lib/sysctl.d/55-kernel-hardening.conf ...
* Applying /usr/lib/sysctl.d/55-magic-sysrq.conf ...
* Applying /usr/lib/sysctl.d/55-map-count.conf ...
* Applying /usr/lib/sysctl.d/55-network-security.conf ...
* Applying /usr/lib/sysctl.d/55-ptrace.conf ...
* Applying /usr/lib/sysctl.d/55-zeropage.conf ...
* Applying /etc/sysctl.d/99-cloudimg-ipv6.conf ...
kazulog@sv1:~$ sysctl vm.swappiness
vm.swappiness = 60
kazulog@sv1:~$ sudo sysctl -w vm.swappiness=10
vm.swappiness = 10
kazulog@sv1:~$ sysctl vm.swappiness
vm.swappiness = 10
kazulog@sv1:~$ cat /proc/sys/vm/swappiness
10
kazulog@sv1:~$ echo 20 | sudo tee /proc/sys/vm/swappiness
20
kazulog@sv1:~$ sysctl vm.swappiness
vm.swappiness = 20