Add script to update package manager defs and packages

set_script_env_vars

@@ -3,10 +3,26 @@
     exit 1
 
 local install_cmd=''
+local update_pkg_manager_and_defs_cmd=''
+local update_pkgs_cmd=''
 case $BOX_SETUP_OS in
-    (arch | artix) install_cmd="sudo pacman -S" ;;
-    (debian) install_cmd="sudo apt install" ;;
-    (macos) install_cmd="brew install" ;;
+    (arch | artix)
+        install_cmd="sudo pacman -S"
+        update_pkg_manager_and_defs_cmd='' # don't; update system instead?
+        update_pkgs_cmd='sudo pacman -Syu'
+	;;
+    (debian)
+        install_cmd="sudo aptitude install"
+        update_pkg_manager_and_defs_cmd='sudo aptitude update'
+        update_pkgs_cmd='sudo aptitude full-upgrade'
+	;;
+    (macos)
+        install_cmd="brew install"
+        update_pkg_manager_and_defs_cmd='brew update'
+        update_pkgs_cmd='brew upgrade'
+	;;
 esac
 
 export BOX_SETUP_INSTALL_COMMAND="$install_cmd"
+export BOX_SETUP_UPDATE_PKG_MANAGER_AND_DEFS_CMD="$update_pkg_manager_and_defs_cmd"
+export BOX_SETUP_UPDATE_PKGS_CMD="$update_pkgs_cmd"