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Optimise JPEG images. More information: <https://github.com/tjko/jpegoptim>.

Manage services by running init scripts. The full script path should be omitted (/etc/init.d/ is assumed). More information: <https://manned.org/service>.

systemctl

Control the systemd system and service manager. More information: <https://www.freedesktop.org/software/systemd/man/systemctl.html>.

sshfs

Filesystem client based on SSH. More information: <https://github.com/libfuse/sshfs>.

groff

GNU replacement for the troff and nroff typesetting utilities. More information: <https://www.gnu.org/software/groff>.

Show/manipulate routing, devices, policy routing and tunnels. Some subcommands such as ip address have their own usage documentation. More information: <https://www.man7.org/linux/man-pages/man8/ip.8.html>.

sysctl

List and change kernel runtime variables. More information: <https://manned.org/sysctl.8>.

host

Lookup Domain Name Server. More information: <https://manned.org/host>.