diff --git a/includes/minishell.h b/includes/minishell.h
index 72aa317..8045992 100644
--- a/includes/minishell.h
+++ b/includes/minishell.h
@@ -6,7 +6,7 @@
 /*   By: tmaze <tmaze@student.42.fr>                +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2018/11/18 13:12:34 by tmaze             #+#    #+#             */
-/*   Updated: 2019/10/31 14:38:16 by tmaze            ###   ########.fr       */
+/*   Updated: 2019/11/10 20:57:46 by tmaze            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -38,12 +38,14 @@ int					cmd_unsetenv(char **argv, t_env **env);
 int					cmd_cd(char **argv, t_env **env);
 int					cmd_echo(char **argv, t_env **env);
 
-void				lstdelelem(t_env **elem);
-void				lstdel(t_env **env);
-t_env				*lstnew(char *env);
-t_env				*lstaddend(t_env **alst, t_env *new);
-t_env				*lstgetelem(char *key, t_env *env);
-char				**lsttotab(t_env *env);
+void				ft_envdelelem(t_env **elem);
+void				ft_envdel(t_env **env);
+t_env				*ft_envnew(char *env);
+t_env				*ft_envaddend(t_env **alst, t_env *new);
+t_env				*ft_envgetelem(char *key, t_env *env);
+char				**ft_envtotab(t_env *env);
+char				*ft_envupdate(char *key, t_env *env, char *val);
+void				ft_envclean(t_env **env);
 
 char				**res_ext(char **argv, t_env *env);
 
diff --git a/srcs/cmd_cd.c b/srcs/cmd_cd.c
index 6563093..0249e8e 100644
--- a/srcs/cmd_cd.c
+++ b/srcs/cmd_cd.c
@@ -5,16 +5,155 @@
 /*                                                    +:+ +:+         +:+     */
 /*   By: tmaze <tmaze@student.42.fr>                +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
-/*   Created: 2019/09/20 14:42:42 by tmaze             #+#    #+#             */
-/*   Updated: 2019/11/03 00:39:59 by tmaze            ###   ########.fr       */
+/*   Created: 2019/01/07 16:44:40 by tmaze             #+#    #+#             */
+/*   Updated: 2019/11/10 15:51:51 by tmaze            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "minishell.h"
 
-int	cmd_cd(char **argv, t_env **env)
+void	put_error_cd(char *file, char *msg)
 {
-	(void)argv;
-	(void)env;
+	ft_putstr("cd: ");
+	ft_putstr(file);
+	ft_putstr(": ");
+	ft_putendl(msg);
+}
+
+char	*check_path_slash_cd(char *exec)
+{
+	int			i;
+	struct stat	info;
+	struct stat info2;
+
+	if (exec[0] == '/')
+	{
+		if ((i = access(exec, F_OK)) != 0)
+			put_error_cd(exec, "no such file or directory");
+		if (i != 0)
+			return (NULL);
+		if ((i = lstat(exec, &info)) != 0)
+			put_error_cd(exec, "can't determine info");
+		if (i != 0)
+			return (NULL);
+		if (!S_ISDIR(info.st_mode) || (S_ISLNK(info.st_mode) && ((i = stat(exec, &info2)) != 0 || !S_ISDIR(info2.st_mode))))
+		{
+			put_error_cd(exec, "not a directory");
+			return (NULL);
+		}
+		if ((i = access(exec, X_OK)) != 0)
+			put_error_cd(exec, "permission denied");
+		if (i != 0)
+			return (NULL);
+		return (exec);
+	}
+	return (NULL);
+}
+
+int		cmd_cd_update_env(char *path, t_env **env, char opt)
+{
+	t_env	*pwd;
+	char	*oldpwd;
+	char	*c_path;
+	char	p_path[4096];
+
+	ft_bzero(p_path, 4096);
+	if (!(pwd = ft_envgetelem("PWD", *env)))
+	{
+		put_error_cd(path, "env var PWD undefined");
+		return (1);
+	}
+	if (getcwd(p_path, 4096) == NULL || (oldpwd = ft_strdup(pwd->val)) == NULL
+		|| ft_realpath(path, &c_path) == NULL)
+	{
+		put_error_cd(path, "error");
+		return (1);
+	}
+	if (ft_envupdate("PWD", *env, ((opt == 'P') ? p_path : c_path)) == NULL
+		|| ft_envupdate("OLDPWD", *env, oldpwd) == NULL)
+	{
+		put_error_cd(path, "error");
+		ft_strdel(&oldpwd);
+		ft_strdel(&c_path);
+		return (1);
+	}
+	ft_strdel(&oldpwd);
+	ft_strdel(&c_path);
 	return (0);
 }
+
+int		cmd_cd_core(char *path, t_env **env, char opt)
+{
+	t_env	*pwd;
+
+	if (check_path_slash_cd(path) == NULL)
+	{
+		put_error_cd(path, "invalid path");
+		return (1);
+	}
+	if (chdir(path) == -1
+		|| (pwd = ft_envgetelem("PWD", *env)) == NULL)
+	{
+		put_error_cd(path, "error");
+		return (1);
+	}
+	return (cmd_cd_update_env(path, env, opt));
+}
+
+char	cd_getparams(char **argv, size_t *i)
+{
+	char	ret[2];
+	size_t	j;
+
+	ret[1] = '\0';
+	ret[0] = 'L';
+	*i = 0;
+	while (argv[++(*i)] && argv[*i][0] == '-' && ft_strlen(argv[*i]) > 1)
+	{
+		j = 1;
+		while (argv[*i][j] && (argv[*i][j] == 'L' || argv[*i][j] == 'P'))
+			ret[0] = argv[*i][j++];
+		if (argv[*i][j] && argv[*i][j] != 'L' && argv[*i][j] != 'P')
+		{
+			ret[0] = argv[*i][j];
+			put_error_cd(ret, "invalid option");
+			put_error_cd("usage", "cd [-L|-P] [dir]");
+			ret[0] = '\0';
+			break ;
+		}
+	}
+	return (ret[0]);
+}
+
+int		cmd_cd(char **argv, t_env **env)
+{
+	t_env	*elem;
+	size_t	i;
+	char	*path;
+	char	opt;
+	int		ret;
+
+	i = 0;
+	if ((opt = cd_getparams(argv, &i)) == '\0')
+		return (1);
+	if (!argv[i] && (elem = ft_envgetelem("HOME", *env)) != NULL && elem->val != NULL)
+		return (cmd_cd_core(elem->val, env, opt));
+	else if (argv[i] && argv[i][0] == '/')
+		return (cmd_cd_core(argv[i], env, opt));
+	else if (argv[i] && argv[i][0] == '-' && (elem = ft_envgetelem("OLDPWD", *env)) != NULL)
+		return (cmd_cd_core(elem->val, env, opt));
+	else if (argv[i] && argv[i][0] != '/' && (elem = ft_envgetelem("PWD", *env)) != NULL && elem->val != NULL)
+	{
+		if ((path = ft_strnew(ft_strlen(elem->val) + ft_strlen(argv[i]) + 1)) == NULL)
+			put_error_cd(argv[i], "memory error");
+		if (path == NULL)
+			return (1);
+		ft_strcpy(path, elem->val);
+		path[ft_strlen(path)] = '/';
+		ft_strcat(path, argv[i]);
+		ret = cmd_cd_core(path, env, opt);
+		ft_strdel(&path);
+		return (ret);
+	}
+	return (1);
+}
diff --git a/srcs/cmd_env.c b/srcs/cmd_env.c
index 83dcc4c..01eaa54 100644
--- a/srcs/cmd_env.c
+++ b/srcs/cmd_env.c
@@ -6,7 +6,7 @@
 /*   By: tmaze <tmaze@student.42.fr>                +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/09/20 14:33:48 by tmaze             #+#    #+#             */
-/*   Updated: 2019/10/17 10:07:21 by tmaze            ###   ########.fr       */
+/*   Updated: 2019/11/08 21:55:51 by tmaze            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -35,7 +35,7 @@ t_env		*envcpy(t_env *env)
 	if (env != NULL && (cpy = (t_env*)ft_memalloc(sizeof(t_env))) != NULL)
 		if ((cpy->key = ft_strdup(env->key)) == NULL
 			|| (cpy->val = ft_strdup(env->val)) == NULL)
-			lstdelelem(&cpy);
+			ft_envdelelem(&cpy);
 	return (cpy);
 }
 
@@ -55,11 +55,11 @@ int			cmd_env(char **argv, t_env **env)
 		{
 			if ((new = envcpy(it)) == NULL)
 			{
-				lstdel(&env_cp);
+				ft_envdel(&env_cp);
 				ft_putstr_fd("minishell: env: Env copy error\n", 2);
 				return (2);
 			}
-			lstaddend(&env_cp, new);
+			ft_envaddend(&env_cp, new);
 			it = it->next;
 		}
 	}
@@ -69,6 +69,6 @@ int			cmd_env(char **argv, t_env **env)
 		exec_cmd(argv + i, &env_cp);
 	else
 		put_env(env_cp);
-	lstdel(&env_cp);
+	ft_envdel(&env_cp);
 	return (0);
 }
diff --git a/srcs/cmd_setenv.c b/srcs/cmd_setenv.c
index 55498d1..65295d0 100644
--- a/srcs/cmd_setenv.c
+++ b/srcs/cmd_setenv.c
@@ -6,7 +6,7 @@
 /*   By: tmaze <tmaze@student.42.fr>                +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/09/20 14:41:08 by tmaze             #+#    #+#             */
-/*   Updated: 2019/11/02 23:10:32 by tmaze            ###   ########.fr       */
+/*   Updated: 2019/11/10 21:38:30 by tmaze            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -15,20 +15,25 @@
 int	cmd_setenv(char **argv, t_env **env)
 {
 	t_env	*new;
+	t_env	*tmp;
 
-	if (argv[1] && (new = lstnew(argv[1])) != NULL)
+	if (argv[1] && (new = ft_envnew(argv[1])) != NULL)
 	{
-		lstaddend(env, new);
+		if (argv[1] && (tmp = ft_envgetelem(new->key, *env)) != NULL)
+		{
+			ft_strdel(&(tmp->val));
+			tmp->val = new->val;
+			ft_strdel(&(new->key));
+			ft_memdel((void**)&new);
+		}
+		else
+			ft_envaddend(env, new);
+		ft_envclean(env);
 		return (0);
 	}
-	else if (argv[1])
-	{
+	else if (argv[1] && argv[1][0] != '=' && !ft_strchr(argv[1], '='))
 		ft_printf("minishell: setenv: memory error\n");
-		return (2);
-	}
 	else
-	{
 		ft_printf("usage: setenv [KEY]=[value]\n");
-		return (1);
-	}
+	return (1);
 }
diff --git a/srcs/cmd_unsetenv.c b/srcs/cmd_unsetenv.c
index 8e02988..ad757f7 100644
--- a/srcs/cmd_unsetenv.c
+++ b/srcs/cmd_unsetenv.c
@@ -6,7 +6,7 @@
 /*   By: tmaze <tmaze@student.42.fr>                +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/09/20 14:42:01 by tmaze             #+#    #+#             */
-/*   Updated: 2019/10/17 10:58:23 by tmaze            ###   ########.fr       */
+/*   Updated: 2019/11/10 15:52:09 by tmaze            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -29,7 +29,7 @@ int	cmd_unsetenv(char **argv, t_env **env)
 		{
 			tmp = *it;
 			*it = tmp->next;
-			lstdelelem(&tmp);
+			ft_envdelelem(&tmp);
 			return (0);
 		}
 		it = &((*it)->next);
diff --git a/srcs/main.c b/srcs/main.c
index ad4e88a..e9ad6d7 100644
--- a/srcs/main.c
+++ b/srcs/main.c
@@ -6,7 +6,7 @@
 /*   By: tmaze <tmaze@student.42.fr>                +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/09/19 17:08:46 by tmaze             #+#    #+#             */
-/*   Updated: 2019/10/31 14:36:15 by tmaze            ###   ########.fr       */
+/*   Updated: 2019/11/10 21:24:36 by tmaze            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -22,12 +22,12 @@ t_env	*env2lst(char **env)
 	ret = NULL;
 	while (env[i])
 	{
-		if ((new = lstnew(env[i])) != NULL)
-			lstaddend(&ret, new);
+		if ((new = ft_envnew(env[i])) != NULL)
+			ft_envaddend(&ret, new);
 		else
 		{
-			lstdelelem(&new);
-			lstdel(&ret);
+			ft_envdelelem(&new);
+			ft_envdel(&ret);
 			return (NULL);
 		}
 		i++;
@@ -57,24 +57,12 @@ int		main(void)
 			&& (argv = ft_strsplit(cmd, ' ')) != NULL)
 		{
 			ft_strdel(&cmd);
-			i = 0;
-			ft_printf("before:\n");
-			while (argv[i])
-			{
-				ft_printf("%s\n", argv[i++]);
-			}
 			if ((res_ext(argv, env)) != NULL)
 			{
-				i = 0;
-				ft_printf("after:\n");
-				while (argv[i])
-				{
-					ft_printf("%s\n", argv[i++]);
-				}
 				if (ft_strequ(argv[0], "exit"))
 				{
 					ft_del_words_tables(&argv);
-					lstdel(&env);
+					ft_envdel(&env);
 					return (0);
 				}
 				i = 0;
@@ -88,9 +76,7 @@ int		main(void)
 					i++;
 				}
 				if (i == S_BIN)
-				{
 					exec_cmd(argv, &env);
-				}
 			}
 		}
 		ft_strdel(&cmd);
@@ -98,6 +84,6 @@ int		main(void)
 	}
 	ft_del_words_tables(&argv);
 	ft_strdel(&cmd);
-	lstdel(&env);
+	ft_envdel(&env);
 	return (0);
 }
diff --git a/srcs/ms_env.c b/srcs/ms_env.c
index 09c8e27..4b31def 100644
--- a/srcs/ms_env.c
+++ b/srcs/ms_env.c
@@ -6,13 +6,13 @@
 /*   By: tmaze <tmaze@student.42.fr>                +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/09/20 11:43:53 by tmaze             #+#    #+#             */
-/*   Updated: 2019/10/18 14:20:41 by tmaze            ###   ########.fr       */
+/*   Updated: 2019/11/10 20:49:35 by tmaze            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "minishell.h"
 
-void	lstdelelem(t_env **elem)
+void	ft_envdelelem(t_env **elem)
 {
 	if (elem)
 	{
@@ -22,7 +22,7 @@ void	lstdelelem(t_env **elem)
 	}
 }
 
-void	lstdel(t_env **env)
+void	ft_envdel(t_env **env)
 {
 	t_env *tmp;
 
@@ -30,11 +30,11 @@ void	lstdel(t_env **env)
 	{
 		tmp = *env;
 		*env = (*env)->next;
-		lstdelelem(&tmp);
+		ft_envdelelem(&tmp);
 	}
 }
 
-t_env	*lstnew(char *env)
+t_env	*ft_envnew(char *env)
 {
 	t_env	*ret;
 	int		i;
@@ -46,11 +46,11 @@ t_env	*lstnew(char *env)
 	if (env[i] == '=' && (ret = (t_env*)ft_memalloc(sizeof(t_env))) != NULL)
 		if ((ret->val = ft_strsub(env, i + 1, ft_strlen(env) - i - 1)) == NULL
 			|| (ret->key = ft_strsub(env, 0, i)) == NULL)
-			lstdelelem(&ret);
+			ft_envdelelem(&ret);
 	return (ret);
 }
 
-t_env	*lstaddend(t_env **alst, t_env *new)
+t_env	*ft_envaddend(t_env **alst, t_env *new)
 {
 	t_env *tmp;
 
@@ -68,7 +68,7 @@ t_env	*lstaddend(t_env **alst, t_env *new)
 	return (*alst);
 }
 
-t_env	*lstgetelem(char *key, t_env *env)
+t_env	*ft_envgetelem(char *key, t_env *env)
 {
 	t_env	*it;
 
@@ -78,41 +78,79 @@ t_env	*lstgetelem(char *key, t_env *env)
 	return (it);
 }
 
-char	**lsttotab(t_env *env)
+char	*ft_envtochar(t_env *env)
+{
+	int		size;
+	char	*ret;
+
+	size = ft_strlen(env->key) + ft_strlen(env->val) + 1;
+	if ((ret = ft_strnew(size)) != NULL)
+	{
+		ft_strlcpy(ret, env->key, size);
+		ft_strlcat(ret, "=", size);
+		ft_strlcat(ret, env->val, size);
+	}
+	return (ret);
+}
+
+char	**ft_envtotab(t_env *env)
 {
 	t_env	*it;
 	char	*new;
 	char	**ret;
-	size_t	size;
 	int		i;
 
 	i = 0;
 	ret = NULL;
 	it = env;
-	while (it)
-	{
-		i++;
+	while (it && (++i))
 		it = it->next;
-	}
 	if ((ret = (char**)ft_memalloc(sizeof(char*) * (i + 1))) == NULL)
 		return (NULL);
-	while (i >= 0)
-		ret[i--] = NULL;
 	it = env;
 	i = 0;
 	while (it)
 	{
-		size = ft_strlen(it->key) + ft_strlen(it->val) + 1;
-		if ((new = ft_strnew(size)) == NULL)
-		{
+		if ((new = ft_envtochar(it)) == NULL)
 			ft_del_words_tables(&ret);
+		if (new == NULL)
 			break ;
-		}
-		ft_strlcpy(new, it->key, size);
-		ft_strlcat(new, "=", size);
-		ft_strlcat(new, it->val, size);
 		ret[i++] = new;
 		it = it->next;
 	}
 	return (ret);
 }
+
+char *ft_envupdate(char *key, t_env *env, char *val)
+{
+	t_env	*elem;
+	char	*new;
+
+	new = NULL;
+	if ((elem = ft_envgetelem(key, env)) != NULL)
+		if ((new = ft_strdup(val)) != NULL)
+		{
+			ft_strdel(&elem->val);
+			elem->val = new;
+		}
+	return (new);
+}
+
+void	ft_envclean(t_env **env)
+{
+	t_env **it;
+	t_env *tmp;
+
+	it = env;
+	while (*it)
+	{
+		if (ft_strequ((*it)->val, "")) 
+		{
+			tmp = *it;
+			*it = tmp->next;
+			ft_envdelelem(&tmp);
+		}
+		else
+			it = &((*it)->next);
+	}
+}
diff --git a/srcs/ms_exec.c b/srcs/ms_exec.c
index 3d1f068..a3cede5 100644
--- a/srcs/ms_exec.c
+++ b/srcs/ms_exec.c
@@ -6,7 +6,7 @@
 /*   By: tmaze <tmaze@student.42.fr>                +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/09/26 16:25:00 by tmaze             #+#    #+#             */
-/*   Updated: 2019/10/18 14:22:23 by tmaze            ###   ########.fr       */
+/*   Updated: 2019/11/10 15:52:54 by tmaze            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -62,7 +62,7 @@ char	*check_path_dot(char *exec, t_env *env)
 	char	*tmp;
 	char	*ret;
 
-	if ((path = lstgetelem("PWD", env)) == NULL
+	if ((path = ft_envgetelem("PWD", env)) == NULL
 		|| path->val == NULL || (tmp = ft_strjoin(path->val, "/")) == NULL)
 	{
 		put_error(exec, "memory error");
@@ -101,7 +101,7 @@ char	*check_path(char *exec, t_env *env)
 			return (check_path_slash(exec));
 		if (exec[0] == '.')
 			return (check_path_dot(exec, env));
-		if ((path = lstgetelem("PATH", env)) == NULL
+		if ((path = ft_envgetelem("PATH", env)) == NULL
 			|| path->val == NULL
 			|| (path_elems = ft_strsplit(path->val, ':')) == NULL)
 		{
@@ -147,7 +147,7 @@ int		exec_cmd(char **argv, t_env **env)
 	char				**env_tab;
 	char				*path;
 
-	if ((env_tab = lsttotab(*env)) == NULL)
+	if ((env_tab = ft_envtotab(*env)) == NULL)
 		return (-1);
 	if ((path = check_path(argv[0], *env)) == NULL)
 		ft_del_words_tables(&env_tab);
@@ -161,7 +161,7 @@ int		exec_cmd(char **argv, t_env **env)
 		if (ft_strcmp(path, argv[0]) != 0)
 			ft_strdel(&path);
 		ft_del_words_tables(&env_tab);
-		lstdel(env);
+		ft_envdel(env);
 		exit(-1);
 	}
 	else if (ret == -1)
diff --git a/srcs/ms_ext.c b/srcs/ms_ext.c
index 72ae95b..883a94d 100644
--- a/srcs/ms_ext.c
+++ b/srcs/ms_ext.c
@@ -6,7 +6,7 @@
 /*   By: tmaze <tmaze@student.42.fr>                +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/10/25 18:21:47 by tmaze             #+#    #+#             */
-/*   Updated: 2019/11/02 00:35:13 by tmaze            ###   ########.fr       */
+/*   Updated: 2019/11/10 15:55:39 by tmaze            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -49,17 +49,17 @@ char	**res_ext(char **argv, t_env *env)
 	{
 		i = 0;
 		while (argv[k] && argv[k][i]) {
-            if (i == 0 && argv[k][i] == '~' && lstgetelem("HOME", env)) {
+            if (i == 0 && argv[k][i] == '~' && ft_envgetelem("HOME", env)) {
 				res_len =
-					ft_strlen(argv[k]) - 1 + ft_strlen(lstgetelem("HOME", env)->val);
+					ft_strlen(argv[k]) - 1 + ft_strlen(ft_envgetelem("HOME", env)->val);
 				if ((ret = ft_strnew(res_len)) != NULL) {
-					ft_strcpy(ret, lstgetelem("HOME", env)->val);
+					ft_strcpy(ret, ft_envgetelem("HOME", env)->val);
 					if (ret[ft_strlen(ret) - 1] != '/')
 						ft_strcat(ret, "/");
 					ft_strcat(ret, argv[k] + 1);
 					ft_strdel(&(argv[k]));
 					argv[k] = ret;
-					i = ft_strlen(lstgetelem("HOME", env)->val);
+					i = ft_strlen(ft_envgetelem("HOME", env)->val);
 				} else {
 					ft_printf("minishell: memory error\n");
 					return (NULL);