stable version. add scripts for fast update

update-nixos.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# ---------------- CONFIG ----------------
+SRC_FOLDER="./nixos"         # folder in your repo
+DEST_FOLDER="/etc/nixos"     # target folder
+# ----------------------------------------
+
+# Check for root
+if [[ $EUID -ne 0 ]]; then
+  echo "This script must be run as root (sudo)." 1>&2
+  exit 1
+fi
+
+echo "Copying files from '$SRC_FOLDER' to '$DEST_FOLDER'..."
+
+# Backup existing /etc/nixos (optional)
+BACKUP_DIR="/etc/nixos.bak.$(date +%Y%m%d%H%M%S)"
+echo "Backing up current /etc/nixos to $BACKUP_DIR"
+cp -r "$DEST_FOLDER" "$BACKUP_DIR"
+
+# Copy files
+cp -a "$SRC_FOLDER/." "$DEST_FOLDER/"
+
+echo "Done! Files from '$SRC_FOLDER' have been copied to '$DEST_FOLDER'."
+# echo "You may now run 'sudo nixos-rebuild switch' if needed."
+
+nixos-rebuild switch
+
+echo "Done!"