;;; 70-process-management-lesson.el --- process-management-lesson

(defun process-management-lesson ()
  "Linux+ lesson for process management and signals."
  (interactive)
  (delete-other-windows)
  (let ((buf (get-buffer-create "*Process Management Lesson*"))
        (shell (or shell-file-name (getenv "SHELL") "/bin/sh")))
    (switch-to-buffer buf)
    (read-only-mode -1)
    (erase-buffer)
    (insert
     "Linux+ Lesson: Process Management and Signals\n"
     "============================================\n\n"
     "Concepts:\n"
     "- ps shows processes\n"
     "- top shows live processes\n"
     "- kill sends signals to processes\n"
     "- pkill kills by process name\n"
     "- jobs shows shell background jobs\n\n"
     "Important signals:\n"
     "  SIGTERM = 15 = graceful termination\n"
     "  SIGKILL = 9  = forced termination\n\n"
     "Hands-on tasks:\n\n"
     "1. View running processes:\n"
     "     ps aux | less\n\n"
     "2. View live processes:\n"
     "     top\n"
     "   Press q to quit.\n\n"
     "3. Start a background process:\n"
     "     sleep 300 &\n\n"
     "4. View background jobs:\n"
     "     jobs\n\n"
     "5. Find the sleep process:\n"
     "     ps aux | grep sleep\n\n"
     "6. Kill the process gracefully:\n"
     "     kill PID\n\n"
     "7. Start another sleep process:\n"
     "     sleep 300 &\n\n"
     "8. Kill it by name:\n"
     "     pkill sleep\n\n"
     "9. Start another sleep process:\n"
     "     sleep 300 &\n\n"
     "10. Kill with SIGKILL:\n"
     "      kill -9 PID\n\n"
     "Linux+ exam traps:\n"
     "- kill sends signals, it does NOT always mean SIGKILL\n"
     "- kill default signal is SIGTERM (15)\n"
     "- pkill works by process name\n"
     "- ps aux is VERY important\n\n"
     "When finished, run:\n"
     "  M-x process-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)))

;;; 70-process-management-lesson.el ends here