;;; 40-package-management-lesson.el --- package-management-lesson

(defun package-management-lesson ()
  "Linux+ lesson for apt vs dnf package management."
  (interactive)
  (delete-other-windows)
  (let ((buf (get-buffer-create "*Package Management Lesson*"))
        (shell (or shell-file-name (getenv "SHELL") "/bin/sh")))
    (switch-to-buffer buf)
    (read-only-mode -1)
    (erase-buffer)
    (insert
     "Linux+ Lesson: Package Management (Debian vs Red Hat)\n"
     "=====================================================\n\n"
     "You MUST know both ecosystems.\n\n"
     "Debian-based systems (Debian, Ubuntu):\n"
     "  apt update        → refresh package list\n"
     "  apt upgrade       → upgrade installed packages\n"
     "  apt install pkg   → install package\n"
     "  apt remove pkg    → remove package\n\n"
     "Red Hat-based systems (RHEL, Rocky, Alma):\n"
     "  dnf check-update  → check for updates\n"
     "  dnf upgrade       → upgrade system\n"
     "  dnf install pkg   → install package\n"
     "  dnf remove pkg    → remove package\n\n"
     "Hands-on tasks:\n\n"
     "DEBIAN VM:\n"
     "  sudo apt update\n"
     "  sudo apt install tree\n"
     "  tree\n"
     "  sudo apt remove tree\n\n"
     "ROCKY VM:\n"
     "  sudo dnf check-update\n"
     "  sudo dnf install tree\n"
     "  tree\n"
     "  sudo dnf remove tree\n\n"
     "What to notice:\n"
     "- Command differences (apt vs dnf)\n"
     "- Same concepts, different syntax\n\n"
     "Linux+ exam traps:\n"
     "- apt is NOT used on Red Hat\n"
     "- dnf/yum are NOT used on Debian\n\n"
     "When finished, run:\n"
     "  M-x package-management-quiz\n")
    (goto-char (point-min))
    (view-mode 1)
    (split-window-below)
    (other-window 1)
    (let ((term (get-buffer "*term*")))
      (if (buffer-live-p term)
          (switch-to-buffer term)
        (ansi-term shell "term")))
    (other-window -1)))

;;; 40-package-management-lesson.el ends here