diff --git a/configs/base-functions.el b/configs/base-functions.el
index bd3fc07..db46d50 100644
--- a/configs/base-functions.el
+++ b/configs/base-functions.el
@@ -7,39 +7,38 @@
 
 ;;; Code:
 
-;; Buscar el texto actualmente seleccionado
-(defun kj-isearch-with-region ()
-  "Use region as the isearch text."
-  (when mark-active
-    (let ((region (funcall region-extract-function nil)))
-      (deactivate-mark)
-      (isearch-push-state)
-      (isearch-yank-string region))))
+;; Comentar línea o región
+(defun comment-or-uncomment-region-or-line ()
+    "Comments or uncomments the region or the current line if there's no active region."
+    (interactive)
+    (let (beg end)
+        (if (region-active-p)
+            (setq beg (region-beginning) end (region-end))
+            (setq beg (line-beginning-position) end (line-end-position)))
+        (comment-or-uncomment-region beg end)
+        ;;(next-line) ;; saltar a la siguiente línea
+        ))
 
-(add-hook 'isearch-mode-hook #'kj-isearch-with-region)
+;; Duplicar la línea actual
+(defun duplicate-current-line (&optional n)
+  "duplicate current line, make more than 1 copy given a numeric argument"
+  (interactive "p")
+  (save-excursion
+    (let ((nb (or n 1))
+    	  (current-line (thing-at-point 'line)))
+      ;; when on last line, insert a newline first
+      (when (or (= 1 (forward-line 1)) (eq (point) (point-max)))
+    	(insert "\n"))
+
+      ;; now insert as many time as requested
+      (while (> n 0)
+    	(insert current-line)
+    	(decf n)))))
 
 ;; Borrar espacios, tabs y saltos de línea innecesarios al guardar
 (add-hook 'before-save-hook 'delete-trailing-whitespace)
 
-;; Hacer emacs transparente (no funciona perfecto, pero sirve)
-(defun toggle-transparency ()
-  "Cambia la  transparencia de Emacs (es un poco useless)."
-  (interactive)
-  (let ((alpha (frame-parameter nil 'alpha)))
-    (set-frame-parameter
-     nil 'alpha
-     (if (eql (cond ((numberp alpha) alpha)
-                    ((numberp (cdr alpha)) (cdr alpha))
-                    ;; Also handle undocumented (<active> <inactive>) form.
-                    ((numberp (cadr alpha)) (cadr alpha)))
-              100)
-         '(60 . 60) '(100 . 100)))))
-
-(defun transparency (value)
-  "Set the transparency VALUE of the frame window.  0=transparent/100=opaque."
-  (interactive "nTransparency Value 0 - 100 opaque:")
-  (set-frame-parameter (selected-frame) 'alpha value))
-
+;; Verifica si es está instalado alltheicons (útil para ver si se usa o no íconos)
 (defun icon-displayable-p ()
   "Return non-nil if icons are displayable."
   (and (display-graphic-p) (daemonp)
diff --git a/configs/base-keys.el b/configs/base-keys.el
index b44a3ff..c0db331 100644
--- a/configs/base-keys.el
+++ b/configs/base-keys.el
@@ -15,11 +15,10 @@
 (global-set-key (kbd "C-z") 'undo)                        ; Unbind C-z y hacerlo funcionar para deshacer cambios
 (global-set-key (kbd "C-S-z") 'undo-redo)                 ; Rehacer cambios con C-S-z
 (global-set-key (kbd "C-S-a") 'mark-whole-buffer)         ; Seleccionar todo con CTRL+SHIFT+a.
-
-(global-set-key (kbd "C-x c c")
-                'comment-or-uncomment-region)             ; Comentar/descomentar en lote
-
+(global-set-key (kbd "C-S-c")
+                'comment-or-uncomment-region-or-line)     ; Comentar/descomentar línea o selección
 (global-set-key (kbd "C-<f11>") 'toggle-frame-maximized)  ; Maximizar / restaurar
+(global-set-key (kbd "C-S-d") 'duplicate-current-line)    ; Duplicar línea
 
 ;; Cambios rápidos de major modes
 (global-set-key (kbd "C-x m") nil)                        ; Unbind mail on C-x m
@@ -35,7 +34,7 @@
 (global-set-key (kbd "C-x <down>") 'windmove-down)
 
 ;; Meta atajos (atajos de atajos)
-(global-set-key (kbd "C-c l d") "\C-a\C- \C-n\M-w\C-y") ; Duplicar línea
+;;(global-set-key (kbd "C-c l d") "\C-a\C- \C-n\M-w\C-y") ; Duplicar línea
 
 (provide 'base-keys)
 ;;; base-keys.el ends here