Users & Groups copypasta.

useradd --create-home --groups sudo,adm $USER

* Good starting point for adding a user on *nix system/server.

sudo usermod -a -G dialout,plugdev $(whoami)

* Modifying an existing user's group memberships.

sudo useradd -m -G tty,libvirt,uucp,wheel,dialout -s /bin/zsh $USER

* Manjaro one-liner for setting default groups.

* (Arch's `UUCP` & setting the login shell.)

sudo usermod -a -G nintendo_switch $USER

* Homebrew Switch `udev` rules to allow running `nvidia tegra exploit` code w/o `root`