Improve the grub manipulation script

scripts/Common/Config/nvidia-dkms/install.sh

@@ -1,4 +1,9 @@
 #!/bin/bash
+
+function install() {
+    local cmdindicator="GRUB_CMDLINE_LINUX_DEFAULT=\"";
+    local config="nvidia_drm.fbdev=1";
+
     # According to: https://wiki.archlinux.org/title/NVIDIA/Tips_and_tricks
     {
         echo "options nvidia NVreg_PreserveVideoMemoryAllocations=1";
@@ -9,3 +14,16 @@ sudo systemctl enable \
         nvidia-suspend.service \
         nvidia-hibernate.service \
         nvidia-resume.service;
+
+    if ! cat /etc/default/grub | grep "$cmdindicator.*$config" > /dev/null;
+    then
+        sudo sed -i /etc/default/grub \
+            -e "/$cmdindicator/{" \
+                -e "s/\($cmdindicator.*[^ ]\)\(\"\)/\1 \2/" \
+                -e "s/\($cmdindicator.*\)\(\"\)/\1$config\2/" \
+            -e "}" \
+        ;
+    fi;
+}
+
+install;