diff --git a/builtins/echo.c b/builtins/echo.c
index 2c3bff4..641313d 100644
--- a/builtins/echo.c
+++ b/builtins/echo.c
@@ -6,7 +6,7 @@
 /*   By: erey-bet <marvin@42.fr>                    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/02/17 13:09:08 by erey-bet          #+#    #+#             */
-/*   Updated: 2023/02/21 23:31:04 by cchauvet         ###   ########.fr       */
+/*   Updated: 2023/02/22 13:23:16 by erey-bet         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -18,80 +18,44 @@ int	is_space(char c)
 		|| c == '\r' || c == '\n');
 }
 
-int	check_argument(char *str, int *check, int i)
+int	check_argument(char *str, int *check)
 {
-	int	y;
-
-	y = 0;
-	if (str[i] == '-')
-	{
-		while (!is_space(str[i]) || (str[i + 1] == '-' ))
-		{
-			i++;
-			if (is_space(str[i]))
-			{
-				y = i;
-				*check = 1;
-			}
-			else if (str[i] == '-' && str[i - 1] != '-')
-				;
-			else if (str[i] != 'n')
-				break ;
-		}
-		i = y;
-		while (is_space(str[i]))
-			i++;
-	}
-	return (i);
-}
-
-char *conca(char **strs)
-{
-	int len;
-	char *str;
-	char *p;
-	int i;
+	int	i;
 
 	i = -1;
-	len = 0;
-	while (strs[++i] != NULL)
-		len += ft_strlen(strs[i]) + 2;
-	str = (char *) ft_calloc(len + 1, sizeof(char));
-	if (str == NULL)
-		return NULL;
-	i = -1;
-	while (strs[++i] != NULL)
-	{
-		ft_strlcat(str, strs[i], ft_strlen(str) + ft_strlen(strs[i]) + 2);
-		if (strs[i + 1] != NULL)
-			str[ft_strlen(str)] = ' ';
-	}
-	str[ft_strlen(str)] = '\0';
-	return (str);
+	while (str[++i])
+		if (str[i] != '-' && str[i] != 'n')
+			return (1);
+	if (ft_strnstr(str, "n", ft_strlen(str)))
+		*check = 1;
+	return (0);
 }
 
 int	echo(int fd, char **strs)
 {
 	int		check;
 	int		i;
-	char	*str;
 
-	str = conca(strs);
 	check = 0;
-	i = 0;
-	while (is_space(str[i]))
-		i++;
-	i = check_argument(str, &check, i);
-	while (str[i])
-		ft_putchar_fd(str[i++], fd);
+	i = -1;
+	while (strs[++i])
+	{
+		while (is_space(*strs[i]))
+			strs[i]++;
+		if (check == 1 || check_argument(strs[i], &check))
+		{
+			ft_putstr_fd(strs[i], fd);
+			if (strs[i + 1] != NULL)
+				write(fd, " ", 1);
+		}
+	}
 	if (!check)
 		write(fd, "\n", 1);
-	free(str);
 	return (0);
 }
 
 /*int	main(int argc, char *argv[])
 {
-	echo(1, argv);
+	echo(1, argv + 1);
 	return (0);
 }*/
diff --git a/builtins/env.c b/builtins/env.c
index 87a2b34..0ba0787 100644
--- a/builtins/env.c
+++ b/builtins/env.c
@@ -6,7 +6,7 @@
 /*   By: cchauvet <cchauvet@student.42angoulem      +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/02/14 14:56:02 by cchauvet          #+#    #+#             */
-/*   Updated: 2023/02/14 14:58:40 by cchauvet         ###   ########.fr       */
+/*   Updated: 2023/02/23 13:20:55 by erey-bet         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -27,3 +27,12 @@ int	print_env(t_list **head, int fd)
 	}
 	return (0);
 }
+
+/*int	main(int argc, char *argv[], char **env)
+{
+	t_list **be;
+
+	be = init_env(env);
+	print_env(be, 1);
+	return (0);
+}*/
diff --git a/builtins/unset.c b/builtins/unset.c
new file mode 100644
index 0000000..1de43be
--- /dev/null
+++ b/builtins/unset.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   unset.c                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: erey-bet <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/02/22 13:28:27 by erey-bet          #+#    #+#             */
+/*   Updated: 2023/02/22 13:37:27 by erey-bet         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	unset(t_list **env, char **args, int fd)
+{
+	while (args++)
+		delete_by_key(*args, env);
+	return (0);
+}
diff --git a/env.c b/env.c
index 2d4d8d4..4e29c04 100644
--- a/env.c
+++ b/env.c
@@ -6,7 +6,7 @@
 /*   By: erey-bet <marvin@42.fr>                    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/02/02 14:39:56 by erey-bet          #+#    #+#             */
-/*   Updated: 2023/02/17 17:11:03 by erey-bet         ###   ########.fr       */
+/*   Updated: 2023/02/23 13:34:41 by erey-bet         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -19,7 +19,7 @@ void	add_sort(t_list **head, t_env *var)
 
 	current = *head;
 	while (current->next != NULL
-		&& ft_strcmp(var->key, ((t_env *)(current->content))->key) != 0)
+		&& ft_strcmp(var->key, ((t_env *)(current->content))->key) > 0)
 		current = current->next;
 	if (current->content == NULL)
 		current->content = var;
@@ -108,3 +108,14 @@ t_list	**init_env(char **env)
 	}
 	return (head);
 }
+
+/*int	main(int argc, char *argv[], char **env)
+{
+	t_list	**n_env;
+
+	n_env = init_env(env);
+	delete_by_key("SSH_AUTH_SOCK", n_env);
+	print_env(n_env, 1);
+
+	return (0);
+}*/
diff --git a/env3.c b/env3.c
index 3c69c62..bca6060 100644
--- a/env3.c
+++ b/env3.c
@@ -6,7 +6,7 @@
 /*   By: erey-bet <marvin@42.fr>                    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/02/17 17:25:09 by erey-bet          #+#    #+#             */
-/*   Updated: 2023/02/21 14:09:42 by cchauvet         ###   ########.fr       */
+/*   Updated: 2023/02/22 13:28:51 by erey-bet         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -61,3 +61,25 @@ int	create_value_by_key_dup(char *key, char *value, t_list **env)
 		return (1);
 	return (0);
 }
+
+int	delete_by_key(char *key, t_list **head)
+{
+	t_list	*last;
+	t_list	*current;
+
+	current = *head;
+	while (current->next != NULL)
+	{
+		if (ft_strcmp(((t_env *)current->content)->key, key) == 0)
+		{
+			if (last->next != NULL)
+				last->next = current->next;
+			else
+				*head = current->next;
+			return (1);
+		}
+		last = current;
+		current = current->next;
+	}
+	return (0);
+}
diff --git a/minishell.h b/minishell.h
index 2a7e5ce..2004f18 100644
--- a/minishell.h
+++ b/minishell.h
@@ -6,7 +6,7 @@
 /*   By: cchauvet <cchauvet@student.42angoulem      +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/02/14 13:45:30 by cchauvet          #+#    #+#             */
-/*   Updated: 2023/02/21 22:03:41 by cchauvet         ###   ########.fr       */
+/*   Updated: 2023/02/23 13:35:42 by erey-bet         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -66,6 +66,7 @@ void		env_del(void *ptr);
 char		**env_to_strs(t_list **head);
 char		*get_value(char *str);
 char		*get_key(char *str);
+int			delete_by_key(char *key, t_list **head);
 
 /* Echo */
 int			echo(int fd, char **strs);
@@ -79,7 +80,7 @@ int			print_export(t_list **head, int fd);
 /* CD */
 int			move_folder(char *path, int fd);
 /* UNSET */
-int			unset(t_list **env, char **args, int fd);
+int			unset(t_list **env, char **args);
 
 typedef struct s_cmd
 {