chsh
chsh - change login shell
Command manuals for configuration
efivar
efivar - Tool to manipulate UEFI variables
route
route - show / manipulate the IP routing table
sysctl
sysctl - configure kernel parameters at runtime
ucf
ucf - Update Configuration File: preserve user changes in configuration files
xrandr
xrandr - primitive command line interface to RandR extension
xset
xset - user preference utility for X