diff --git a/42sh/src/line_editing/underline_function.c b/42sh/src/line_editing/underline_function.c
new file mode 100644
index 00000000..54830597
--- /dev/null
+++ b/42sh/src/line_editing/underline_function.c
@@ -0,0 +1,67 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   underline_function.c                               :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: gwojda <gwojda@student.42.fr>              +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2017/03/22 20:55:24 by gwojda            #+#    #+#             */
+/*   Updated: 2017/03/22 20:56:54 by gwojda           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+
+void	underline_right(char **str, size_t *pos, size_t pos_ref)
+{
+	if (!(*pos < ft_strlen(*str)))
+		return ;
+	if (*pos >= pos_ref)
+	{
+		ft_puttermcaps("mr");
+		data_singleton()->line.copy_tmp = ft_realloc_imput(data_singleton()->
+		line.copy_tmp, (*str)[*pos], data_singleton()->line.pos_tmp);
+		ft_putchar((*str)[*pos]);
+		ft_puttermcaps("me");
+		++(data_singleton()->line.pos_tmp);
+		++(*pos);
+	}
+	else
+	{
+		data_singleton()->line.copy_tmp = ft_remove_imput(data_singleton()->
+		line.copy_tmp, data_singleton()->line.pos_tmp);
+		ft_putchar((*str)[*pos]);
+		if (data_singleton()->line.pos_tmp)
+			--(data_singleton()->line.pos_tmp);
+		++(*pos);
+	}
+}
+
+void	underline_left(char **str, size_t *pos, size_t pos_ref)
+{
+	if (!*pos)
+		return ;
+	if (*pos > pos_ref)
+	{
+		--(*pos);
+		ft_putchar('\b');
+		ft_putchar((*str)[*pos]);
+		ft_putchar('\b');
+		data_singleton()->line.copy_tmp = ft_remove_imput(data_singleton()->
+		line.copy_tmp, data_singleton()->line.pos_tmp);
+		if (data_singleton()->line.pos_tmp)
+			--(data_singleton()->line.pos_tmp);
+	}
+	else
+	{
+		data_singleton()->line.pos_tmp = 0;
+		--(*pos);
+		ft_putchar('\b');
+		ft_puttermcaps("mr");
+		data_singleton()->line.copy_tmp = ft_realloc_imput(data_singleton()->
+		line.copy_tmp, (*str)[*pos], data_singleton()->line.pos_tmp);
+		ft_putchar((*str)[*pos]);
+		ft_puttermcaps("me");
+		ft_putchar('\b');
+	}
+}