pkg

pkg [-h] [-i|-u] <package> [package...]

Installs or removes packages using the detected system package manager. Supports: paru, yay, pacman, apt, dnf, zypper, yum, brew, pkg.

  (no flag)    Auto mode: installs missing packages, removes installed ones
  -i/--install  Force install
  -u/--uninstall  Force uninstall

pkg firefox             # auto: install if missing, remove if present
pkg -i ripgrep fd       # force install
pkg -u cowsay           # force uninstall

The package-installed check uses the correct query for each PM:
  pacman/paru/yay  pacman -Qi
  apt              dpkg -s
  dnf/zypper/yum   rpm -q
  brew             brew list
  pkg              pkg info