diff --git a/.gitignore b/.gitignore
index a1a6a9c..8faecd2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .DS_Store
+Thumbs.db
 *.o
 *.swp
 *.out
@@ -9,9 +10,11 @@
 *.dSYM
 .vscode
 *.lnk
+*.zip
 memo
 memo.txt
 minishell
-*.zip
 arg_test
 osef_temp
+env_var_test
+memo_local
diff --git a/.gitmodules b/.gitmodules
index cb2e6ae..aee5a3e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "libft"]
 	path = libft
 	url = git@bitbucket.org:LuckyLaszlo/libft.git
+[submodule "minishell_tests"]
+	path = minishell_tests
+	url = git@bitbucket.org:LuckyLaszlo/minishell_tests.git
diff --git a/Makefile b/Makefile
index e596344..9a2a361 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@ LIBS =	-L $(LIBFT_D) -lft \
 LIBFT_D = ./libft
 LIBFT = $(LIBFT_D)/libft.a
 
-SRCS =	main.c init.c free.c generic.c error_wrappers.c \
+SRCS =	main.c init.c retrieve_path.c free.c generic.c error_wrappers.c \
 		signals.c \
 		shell_loop.c shell_script.c \
 		lexing.c fill_token.c check_operators.c \
diff --git a/headers/minishell_prototypes.h b/headers/minishell_prototypes.h
index 8a95670..c1b39f3 100644
--- a/headers/minishell_prototypes.h
+++ b/headers/minishell_prototypes.h
@@ -6,14 +6,13 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/08 02:59:58 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/02 15:47:51 by hulamy           ###   ########.fr       */
+/*   Updated: 2021/12/10 10:29:18 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #ifndef MINISHELL_PROTOTYPES_H
 # define MINISHELL_PROTOTYPES_H
 
-// variable globale
 int		g_switch_heredoc_sigint;
 extern char	**environ;
 
@@ -24,7 +23,7 @@ char	**retrieve_path(void);
 int		set_terminal_attributes(struct termios *ori_termios,
 			struct termios *interactive_termios,
 			int *termios_changed); // WIP, TEST, TEMP, PLACEHOLDER, NOT IMPORTANT, :)
-int		set_signals_handling(struct sigaction *signal_behaviour);
+void	set_signals_behaviour(void);
 
 // Shell modes
 void	shell_loop(t_all *c);
@@ -57,20 +56,22 @@ int		simple_command_builtin(t_cmd *cmd, t_all *c);
 int		builtin_cd(int argc, char *argv[], t_all *c);
 int		builtin_pwd(int argc, char *argv[], t_all *c);
 int		builtin_export(int argc, char *argv[], t_all *c);
+int		export_var(char *arg);
 int		builtin_unset(int argc, char *argv[], t_all *c);
 int		builtin_exit(int argc, char *argv[], t_all *c);
 int		builtin_env(int argc, char *argv[], t_all *c);
 int		builtin_echo(int argc, char *argv[], t_all *c);
-int		getenv_position(char **envp, char *name);
 
 // Free
 int		exit_free(t_all *c, int exit_status);
 void	free_pipeline(t_cmd **pipeline_ptr[]);
 void	close_pipeline_fd(t_cmd *pipeline[]);
+void	close_stdio(void);
 typedef void	(*t_free_f)(void *); // generic
 
 // Error wrappers
-void	shell_error(char *s1, char *s2);
+int		shell_error(char *s1, char *s2, char *s3, int ret_val);
+int		shell_perror(char *s1, char *s2, char *s3, int ret_val);
 
 // Generic
 char	*ft_strjoinfree(char *s1, char *s2);
@@ -89,6 +90,9 @@ void	*ft_dup_2d_arr(void	*ptr, void *(*dup_func)(void *));
 void	ft_perror_io(char *err_str, char *io_file);
 int		ft_reti_perror_io(int ret, char *err_str, char *io_file);
 void	ft_free_null(void *ptr);
+char	*ft_getenv(char *env_var);
+size_t	ft_getenv_position(char *env_var);
+int		ft_is_posix_name(char *str);
 
 char	**ft_split_quotes(char const *s, char c);
 char	*ft_strdup_quotes(const char *s);
diff --git a/headers/minishell_structs.h b/headers/minishell_structs.h
index 18f55ee..69b5f79 100644
--- a/headers/minishell_structs.h
+++ b/headers/minishell_structs.h
@@ -46,7 +46,7 @@ typedef struct s_all
 //	struct termios		interactive_termios;
 //	int					termios_changed;
 //	struct sigaction	ori_signal_behaviour;
-	struct sigaction	signal_behaviour;
+//	struct sigaction	signal_behaviour;
 }				t_all;
 
 #endif
diff --git a/libft b/libft
index d58ee38..af88c1c 160000
--- a/libft
+++ b/libft
@@ -1 +1 @@
-Subproject commit d58ee38bab0a9e0449d98efc9522b124c71632fd
+Subproject commit af88c1ce23f0daa453c70cee0c61a30f71c2a622
diff --git a/minishell_tests b/minishell_tests
new file mode 160000
index 0000000..7f638a0
--- /dev/null
+++ b/minishell_tests
@@ -0,0 +1 @@
+Subproject commit 7f638a0bf4e4a08150fb472b1b1e663c60df3038
diff --git a/srcs/builtins/cd.c b/srcs/builtins/cd.c
index 1ceaafa..a1d5981 100644
--- a/srcs/builtins/cd.c
+++ b/srcs/builtins/cd.c
@@ -1,12 +1,82 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   cd.c                                               :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/12/04 19:31:19 by lperrey           #+#    #+#             */
+/*   Updated: 2021/12/08 22:33:56 by lperrey          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
 
 #include "minishell.h"
 
+#define CMD "builtin_cd"
+
+static int	change_prompt(t_all *c);
+static int	change_env_pwd(void);
+
 int	builtin_cd(int argc, char *argv[], t_all *c)
 {
-	(void)argc;
-	chdir(argv[1]);
-	c->prompt = init_prompt(c->prompt_base);
-	if (!c->prompt)
-		return (ft_reti_perror(0, "init_prompt() error"));
+	char	*dir;
+
+	if (argc > 2)
+		return (shell_error("cd: ", "too many arguments", "", EXIT_FAILURE));
+	else if (argc < 2 || ft_strncmp(argv[1], "~", 2) == 0)
+	{
+		dir = getenv("HOME");
+		if (!dir)
+			return (shell_error("cd: ", "HOME not set", "", EXIT_FAILURE));
+	}
+	else if (argc == 2)
+		dir = argv[1];
+	if (chdir(dir) == -1)
+		return (shell_perror("cd: ", dir, ": ", EXIT_FAILURE));
+	if (change_prompt(c) == -1)
+		return (ft_reti_perror(EXIT_FAILURE, CMD", change_prompt()"));
+	if (change_env_pwd() == -1)
+		return (ft_reti_perror(EXIT_FAILURE, CMD", change_env_pwd()"));
+	return (EXIT_SUCCESS);
+}
+
+static int	change_prompt(t_all *c)
+{
+	char	*tmp;
+
+	tmp = init_prompt(c->prompt_base);
+	if (!tmp)
+		return (-1);
+	free(c->prompt);
+	c->prompt = tmp;
+	return (0);
+}
+
+static int	change_env_pwd(void)
+{
+	char	*tmp;
+	int		ret;
+
+	tmp = getenv("PWD");
+	if (tmp)
+	{
+		tmp = ft_strjoin("OLDPWD=", tmp);
+		if (!tmp)
+			return (-1);
+		ret = export_var(tmp);
+		free(tmp);
+		if (ret == -1)
+			return (-1);
+	}
+	tmp = getcwd(NULL, 0);
+	if (!tmp)
+		return (-1);
+	tmp = ft_strjoinfree_s2("PWD=", tmp);
+	if (!tmp)
+		return (-1);
+	ret = export_var(tmp);
+	free(tmp);
+	if (ret == -1)
+		return (-1);
 	return (0);
 }
diff --git a/srcs/builtins/env.c b/srcs/builtins/env.c
index 6642079..0e83f21 100644
--- a/srcs/builtins/env.c
+++ b/srcs/builtins/env.c
@@ -6,16 +6,17 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/10 05:01:26 by lperrey           #+#    #+#             */
-/*   Updated: 2021/11/27 11:18:55 by lperrey          ###   ########.fr       */
+/*   Updated: 2021/12/01 17:19:48 by lperrey          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "minishell.h"
 
-int	builtin_env(int argc, char *argv[], t_all *c) // WIP
+int	builtin_env(int argc, char *argv[], t_all *c)
 {
 	(void)argc;
 	(void)argv;
+	(void)c;
 	ft_putendl_arr_fd(environ, 1);
 	return (0);
 }
diff --git a/srcs/builtins/exit.c b/srcs/builtins/exit.c
index 7a726ea..1464d29 100644
--- a/srcs/builtins/exit.c
+++ b/srcs/builtins/exit.c
@@ -12,7 +12,7 @@
 
 #include "minishell.h"
 
-int	builtin_exit(int argc, char *argv[], t_all *c) // WIP
+int	builtin_exit(int argc, char *argv[], t_all *c)
 {
 	unsigned char	status;
 	int				i;
diff --git a/srcs/builtins/export.c b/srcs/builtins/export.c
index 6e190b7..2d4e285 100644
--- a/srcs/builtins/export.c
+++ b/srcs/builtins/export.c
@@ -1,33 +1,94 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   export.c                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/12/03 13:36:54 by lperrey           #+#    #+#             */
+/*   Updated: 2021/12/06 03:19:30 by lperrey          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
 
 #include "minishell.h"
 
-int	getenv_position(char **envp, char *name) // TODO : virer arg envp et utiliser "extern **environ" à la place
-{
-	int	i;
+static int	change_var_value(char *arg, char *var_name);
 
-	i = 0;
-	while (envp[i] && ft_strncmp(envp[i], name, ft_strlen(name)))
-		i++;
-	return (i);
-}
+#define ERR_ID 1
+#define ERR_ID_STR ": not a valid identifier"
+#define CMD "builtin_export"
 
 int	builtin_export(int argc, char *argv[], t_all *c)
 {
-	char		**var;
-	int			env_position;
+	int	i;
+	int	exit_value;
+	int	ret;
 
 	(void)argc;
-	(void)c;
-	if (!ft_strchr(argv[1], '='))
-		return (0);
-	var = ft_split(argv[1], '=');
-	env_position = getenv_position(environ, var[0]);
-	if (environ[env_position] == '\0')
-		environ = ft_resize_2d_arr(environ, 1);
-	environ[env_position] = ft_strdup(argv[1]);
-	if (!ft_strncmp(var[0], "PATH", 4 + 1)) // TODO : NON. Ce n'est pas la fin de la string donc "strlen() + 1" n'est pas adapté
-		c->path = retrieve_path();
-	// free var
-	return (0);
+	exit_value = EXIT_SUCCESS;
+	i = 1;
+	while (argv[i])
+	{
+		ret = export_var(argv[i]);
+		if (ret == -1)
+			return (ft_reti_perror(EXIT_FAILURE, CMD", export_var()"));
+		else if (ret == ERR_ID)
+			exit_value = EXIT_FAILURE;
+		if (ft_strncmp(argv[i], "PATH=", 5) == 0)
+			c->path = retrieve_path();
+		i++;
+	}
+	return (exit_value);
 }
 
+// in complete shell, must mark arguments for export
+// (Not implemented in minishell)
+// arg == var_name[=value]
+// return "-1" on alloc error 
+int	export_var(char *arg)
+{
+	char	**var_split;
+	int		ret;
+
+	ret = 0;
+	var_split = ft_split(arg, '=');
+	if (!var_split)
+		return (-1);
+	if (!ft_is_posix_name(var_split[0]))
+	{
+		shell_error("export: ", var_split[0], ERR_ID_STR, 0);
+		ft_free_2d_arr(var_split);
+		return (ERR_ID);
+	}
+	if (ft_strchr(arg, '='))
+		ret = change_var_value(arg, var_split[0]);
+	ft_free_2d_arr(var_split);
+	return (ret);
+}
+
+static int	change_var_value(char *arg, char *var_name)
+{
+	int		env_position;
+	char	*tmp;
+
+	env_position = ft_getenv_position(var_name);
+	if (environ[env_position] == NULL)
+	{
+		environ = ft_resize_2d_arr(environ, 1);
+		if (!environ)
+			return (ft_reti_perror(-1, CMD", ft_resize_2d_arr()"));
+	}
+	tmp = ft_strdup(arg);
+	if (!tmp)
+		return (ft_reti_perror(-1, CMD", ft_strdup()"));
+	free(environ[env_position]);
+	environ[env_position] = tmp;
+	return (EXIT_SUCCESS);
+}
+
+/*
+environment variables must be POSIX NAME :
+	3.235 Name
+https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html
+#tag_03_235
+*/
diff --git a/srcs/builtins/pwd.c b/srcs/builtins/pwd.c
index 7b4f630..981be6c 100644
--- a/srcs/builtins/pwd.c
+++ b/srcs/builtins/pwd.c
@@ -1,15 +1,29 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   pwd.c                                              :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/12/04 19:15:36 by lperrey           #+#    #+#             */
+/*   Updated: 2021/12/04 20:22:49 by lperrey          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
 
 #include "minishell.h"
 
 int	builtin_pwd(int argc, char *argv[], t_all *c)
 {
-	char	*pwd;
+	char	*working_dir;
 
 	(void)argc;
 	(void)argv;
 	(void)c;
-	pwd = getcwd(NULL, 0);
-	write(1, pwd, ft_strlen(pwd));
+	working_dir = getcwd(NULL, 0);
+	if (!working_dir)
+		return (ft_reti_perror(EXIT_FAILURE, "builtin_pwd, getcwd()"));
+	write(1, working_dir, ft_strlen(working_dir));
 	write(1, "\n", 1);
-	return (0);
+	free(working_dir);
+	return (EXIT_SUCCESS);
 }
diff --git a/srcs/builtins/unset.c b/srcs/builtins/unset.c
index 755c76f..474417c 100644
--- a/srcs/builtins/unset.c
+++ b/srcs/builtins/unset.c
@@ -1,24 +1,59 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   unset.c                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/12/05 17:05:05 by lperrey           #+#    #+#             */
+/*   Updated: 2021/12/05 18:14:28 by lperrey          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
 
 #include "minishell.h"
 
+static int	unset_env_var(char *arg);
+
 int	builtin_unset(int argc, char *argv[], t_all *c)
 {
-	int			env_position;
-	int			i;
+	int	i;
+	int	exit_value;
 
 	(void)argc;
 	(void)c;
+	exit_value = EXIT_SUCCESS;
 	i = 1;
 	while (argv[i])
 	{
-		env_position = getenv_position(environ, argv[i]);
-		free(environ[env_position]);
-		while (environ[env_position])
-		{
-			environ[env_position] = environ[env_position + 1];
-			env_position++;
-		}
+		if (unset_env_var(argv[i]) == EXIT_FAILURE)
+			exit_value = EXIT_FAILURE;
 		i++;
 	}
-	return (0);
+	return (exit_value);
 }
+
+static int	unset_env_var(char *arg)
+{
+	int	env_position;
+
+	if (!ft_is_posix_name(arg))
+	{
+		shell_error("unset: ", arg, ": not a valid identifier", 0);
+		return (EXIT_FAILURE);
+	}
+	env_position = ft_getenv_position(arg);
+	free(environ[env_position]);
+	while (environ[env_position])
+	{
+		environ[env_position] = environ[env_position + 1];
+		env_position++;
+	}
+	return (EXIT_SUCCESS);
+}
+
+/*
+environment variables must be POSIX NAME :
+	3.235 Name
+https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html
+#tag_03_235
+*/
diff --git a/srcs/error_wrappers.c b/srcs/error_wrappers.c
index df1d6f2..aef5775 100644
--- a/srcs/error_wrappers.c
+++ b/srcs/error_wrappers.c
@@ -6,13 +6,13 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/12/01 17:16:30 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/01 17:19:02 by lperrey          ###   ########.fr       */
+/*   Updated: 2021/12/05 16:26:48 by lperrey          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "minishell.h"
 
-void	shell_error(char *s1, char *s2)
+int	shell_error(char *s1, char *s2, char *s3, int ret_val)
 {
 	char	*prefix;
 
@@ -22,5 +22,24 @@ void	shell_error(char *s1, char *s2)
 		write(STDERR_FILENO, s1, ft_strlen(s1));
 	if (s2)
 		write(STDERR_FILENO, s2, ft_strlen(s2));
+	if (s3)
+		write(STDERR_FILENO, s3, ft_strlen(s3));
 	write(STDERR_FILENO, "\n", 1);
+	return (ret_val);
+}
+
+int	shell_perror(char *s1, char *s2, char *s3, int ret_val)
+{
+	char	*prefix;
+
+	prefix = "minishell: ";
+	write(STDERR_FILENO, prefix, ft_strlen(prefix));
+	if (s1)
+		write(STDERR_FILENO, s1, ft_strlen(s1));
+	if (s2)
+		write(STDERR_FILENO, s2, ft_strlen(s2));
+	if (s3)
+		write(STDERR_FILENO, s3, ft_strlen(s3));
+	perror(NULL);
+	return (ret_val);
 }
diff --git a/srcs/exec/find_access.c b/srcs/exec/find_access.c
index fbe16e5..22d44a1 100644
--- a/srcs/exec/find_access.c
+++ b/srcs/exec/find_access.c
@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/11/16 01:57:38 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/01 17:16:55 by lperrey          ###   ########.fr       */
+/*   Updated: 2021/12/05 16:20:55 by lperrey          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -48,7 +48,7 @@ int	cmd_find_access(t_cmd *cmd, char *path[])
 		if (!cmd->path)
 		{
 			cmd->error = EXIT_CMD_NOT_FOUND;
-			shell_error(cmd->argv[0], ": command not found");
+			shell_error(cmd->argv[0], ": ", "command not found", 0);
 		}
 	}
 	return (1);
diff --git a/srcs/exec/pipeline.c b/srcs/exec/pipeline.c
index 6646d52..3a0354f 100644
--- a/srcs/exec/pipeline.c
+++ b/srcs/exec/pipeline.c
@@ -45,7 +45,7 @@ static int	open_pipes(t_cmd *pipeline[])
 		else
 			if (close(pipes[STDOUT_FILENO]) == -1)
 				perror("close()");
-		if (pipeline[i]->fd_in == STDIN_FILENO)
+		if (pipeline[i + 1]->fd_in == STDIN_FILENO)
 			pipeline[i + 1]->fd_in = pipes[STDIN_FILENO];
 		else
 			if (close(pipes[STDIN_FILENO]) == -1)
diff --git a/srcs/exec/subshell_exec.c b/srcs/exec/subshell_exec.c
index 273f9bf..1e1374d 100644
--- a/srcs/exec/subshell_exec.c
+++ b/srcs/exec/subshell_exec.c
@@ -14,13 +14,17 @@
 
 int	cmd_exec_in_subshell(t_cmd *cmd, t_all *c)
 {
+	struct sigaction	signal_behaviour;
+
 	cmd->pid = fork();
 	if (cmd->pid == -1)
 		perror("fork()");
 	if (cmd->pid == 0)
 	{
-		c->signal_behaviour.sa_handler = SIG_DFL;
-		sigaction(SIGINT, &c->signal_behaviour, NULL);
+		ft_bzero(&signal_behaviour, sizeof signal_behaviour);
+		signal_behaviour.sa_handler = SIG_DFL;
+		sigaction(SIGINT, &signal_behaviour, NULL);
+		sigaction(SIGQUIT, &signal_behaviour, NULL);
 		if (cmd->fd_in != STDIN_FILENO)
 			if (dup2(cmd->fd_in, STDIN_FILENO) == -1)
 				return (ft_reti_perror(EXIT_FAILURE, "dup2()"));
diff --git a/srcs/free.c b/srcs/free.c
index 285350b..303a182 100644
--- a/srcs/free.c
+++ b/srcs/free.c
@@ -23,6 +23,7 @@ int	exit_free(t_all *c, int exit_status)
 	//if (c->termios_changed)
 	//	tcsetattr(STDIN_FILENO, TCSANOW, &c->ori_termios);
 	rl_clear_history();
+	close_stdio();
 	exit(exit_status);
 }
 
@@ -70,3 +71,13 @@ void	close_pipeline_fd(t_cmd *pipeline[])
 		i++;
 	}
 }
+
+void	close_stdio(void)
+{
+	if (close(STDIN_FILENO) == -1)
+		perror("close()");
+	if (close(STDOUT_FILENO) == -1)
+		perror("close()");
+	if (close(STDERR_FILENO) == -1)
+		perror("close()");
+}
diff --git a/srcs/generic.c b/srcs/generic.c
index 65d8a48..15ef502 100644
--- a/srcs/generic.c
+++ b/srcs/generic.c
@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/08 09:25:35 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/02 15:49:33 by hulamy           ###   ########.fr       */
+/*   Updated: 2021/12/10 10:28:48 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -218,3 +218,76 @@ void	ft_free_null(void *ptr)
 	free(*(char**)ptr);
 	*(char**)ptr = NULL;
 }
+
+/*
+** Search for an environement variable,
+** and return a pointer to the first character after "env_var=" .
+** Return NULL if env_var not found.
+*/
+char	*ft_getenv(char *env_var)
+{
+	int		i;
+	char	*tmp;
+	size_t	env_var_len;
+
+	env_var_len = ft_strlen(env_var);
+	i = 0;
+	tmp = NULL;
+	while (!tmp && environ[i])
+	{
+		if (environ[i][env_var_len] == '=')
+		{
+			if (ft_strncmp(environ[i], env_var, env_var_len) == 0)
+				tmp = &environ[i][env_var_len + 1];
+			else
+				i++;
+		}
+		else
+			i++;
+	}
+	return (tmp);
+}
+
+/*
+** Like ft_getenv(), but return position of env_var instead of value.
+** If env_var not found, return last position of **environ (== NULL)
+*/
+size_t	ft_getenv_position(char *env_var)
+{
+	int		i;
+	int		found;
+	size_t	env_var_len;
+
+	env_var_len = ft_strlen(env_var);
+	i = 0;
+	found = 0;
+	while (!found && environ[i])
+	{
+		if (environ[i][env_var_len] == '=')
+		{
+			if (ft_strncmp(environ[i], env_var, env_var_len) == 0)
+				found = 1;
+			else
+				i++;
+		}
+		else
+			i++;
+	}
+	return (i);
+}
+
+int	ft_is_posix_name(char *str)
+{
+	unsigned int	i;
+
+	if (str[0] != '_' && !ft_isalpha(str[0]))
+		return (0);
+	i = 1;
+	while (str[i])
+	{
+		if (str[i] != '_' && !ft_isalnum(str[i]))
+			return (0);
+		i++;
+	}
+	return (i);
+}
diff --git a/srcs/init.c b/srcs/init.c
index 576e6ba..f4ed219 100644
--- a/srcs/init.c
+++ b/srcs/init.c
@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/08 09:22:12 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/03 06:55:40 by hulamy           ###   ########.fr       */
+/*   Updated: 2021/12/10 10:28:16 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,6 +14,7 @@
 
 static char	*init_prompt_base(void);
 static int	init_readline_hook(void);
+static int	shlvl_init(void);
 
 int	init(t_all *c)
 {
@@ -26,34 +27,45 @@ int	init(t_all *c)
 	rl_startup_hook = NULL;
 	environ = ft_dup_2d_arr(environ, (t_dup_f)ft_strdup);
 	if (!environ)
-		return (ft_reti_perror(0, "ft_dup_2d_arr(environ) error"));
+		return (ft_reti_perror(0, "ft_dup_2d_arr(environ)"));
 	c->path = retrieve_path();
+	if (!shlvl_init())
+		return (ft_reti_perror(0, "shlvl_init()"));
 	c->prompt_base = init_prompt_base();
 	if (!c->prompt_base)
-		return (ft_reti_perror(0, "init_prompt_base() error"));
+		return (ft_reti_perror(0, "init_prompt_base()"));
 	c->prompt = init_prompt(c->prompt_base);
 	if (!c->prompt)
-		return (ft_reti_perror(0, "init_prompt() error"));
-	set_signals_handling(&c->signal_behaviour);
+		return (ft_reti_perror(0, "init_prompt()"));
+	set_signals_behaviour();
 	return (1);
 }
 
-// done : TODO : Un appel à builtin_export() modifiant $PATH doit aussi entrainer un appel à "c->path = retrieve_path()"
-char	**retrieve_path(void)
+static int	shlvl_init(void)
 {
-	char	*path;
-	char	**path_split;
+	char	*tmp;
+	int		ret;
 
-	path = getenv("PATH");
-	if (!path)
-		return (ft_retp_print(NULL, "minishell: Warning, $PATH not set\n", 2));
-	path_split = ft_split(path, ':');
-	if (!path_split)
-		return (ft_retp_perror(NULL, "retrieve_path()"));
-	return (path_split);
+	tmp = getenv("SHLVL");
+	if (tmp && ft_isdigit_str(tmp))
+	{
+		tmp = ft_itoa(ft_atoi(tmp) + 1);
+		if (!tmp)
+			return (0);
+		tmp = ft_strjoinfree_s2("SHLVL=", tmp);
+		if (!tmp)
+			return (0);
+		ret = export_var(tmp);
+		free(tmp);
+	}
+	else
+		ret = export_var("SHLVL=1");
+	if (ret == -1)
+		return (0);
+	return (1);
 }
 
-static char	*init_prompt_base(void) // WIP, error return TODO
+static char	*init_prompt_base(void)
 {
 	char	*prompt_base;
 	char	*tmp;
@@ -64,21 +76,33 @@ static char	*init_prompt_base(void) // WIP, error return TODO
 	if (!tmp)
 		tmp = U_DEFAULT_USER;
 	prompt_base = ft_strjoin(TERM_LIGHT_GREEN, tmp);
+	if (!prompt_base)
+		return (NULL);
 	prompt_base = ft_strjoinfree_s1(prompt_base, "@");
+	if (!prompt_base)
+		return (NULL);
 	tmp = getenv("NAME");
 	if (!tmp)
 		tmp = U_DEFAULT_NAME;
 	prompt_base = ft_strjoinfree_s1(prompt_base, tmp);
+	if (!prompt_base)
+		return (NULL);
 	prompt_base = ft_strjoinfree_s1(prompt_base, TERM_RESET":"TERM_LIGHT_BLUE);
+	if (!prompt_base)
+		return (NULL);
 	return (prompt_base);
 }
 
-char	*init_prompt(char *prompt_base) // WIP, error return TODO
+char	*init_prompt(char *prompt_base)
 {
 	char	*prompt;
 
 	prompt = ft_strjoinfree_s2(prompt_base, getcwd(NULL, 0));
+	if (!prompt)
+		return (NULL);
 	prompt = ft_strjoinfree_s1(prompt, TERM_RESET U_PROMPT_END);
+	if (!prompt)
+		return (NULL);
 	return (prompt);
 }
 
diff --git a/srcs/lexing/lexing.c b/srcs/lexing/lexing.c
index 5914fb4..d3a2775 100644
--- a/srcs/lexing/lexing.c
+++ b/srcs/lexing/lexing.c
@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/19 08:38:55 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/01 14:54:22 by lperrey          ###   ########.fr       */
+/*   Updated: 2021/12/05 17:11:31 by lperrey          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -63,6 +63,7 @@ static int	tokenize_input(t_token *t, char *input, size_t input_len)
 }
 
 /*
+	2.3 Token Recognition
 https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
 #tag_18_03
 */
diff --git a/srcs/parsing/expansions/expand_token.c b/srcs/parsing/expansions/expand_token.c
index d34e2a2..ae3e8ba 100644
--- a/srcs/parsing/expansions/expand_token.c
+++ b/srcs/parsing/expansions/expand_token.c
@@ -6,14 +6,12 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/11/07 02:01:33 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/02 15:50:40 by hulamy           ###   ########.fr       */
+/*   Updated: 2021/12/10 10:27:50 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "minishell.h"
 
-//t_list	*ft_lstnew_generic(size_t lst_sizse, size_t content_size);
-
 static t_list	*ret_parameter_expansion(char *content, int *i);
 
 t_list	*expand_token(char *content)
@@ -101,9 +99,12 @@ static t_list	*ret_parameter_expansion(char *content, int *i)
 	free(tmp);
 	if (expand->content)
 		expand->content = ft_strdup(expand->content);
-	else
-		expand->content = ft_calloc(1, 1);
-	if (!expand->content)
-		return (ft_retp_free(NULL, expand, free));
 	return (expand);
 }
+
+/*
+environment variables must be POSIX NAME :
+	3.235 Name
+https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html
+#tag_03_235
+*/
diff --git a/srcs/parsing/expansions/new_token_for_each_field.c b/srcs/parsing/expansions/new_token_for_each_field.c
index 853b8e4..8a285f8 100644
--- a/srcs/parsing/expansions/new_token_for_each_field.c
+++ b/srcs/parsing/expansions/new_token_for_each_field.c
@@ -6,14 +6,12 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/11/07 02:01:33 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/02 15:50:46 by hulamy           ###   ########.fr       */
+/*   Updated: 2021/12/10 10:27:26 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "minishell.h"
 
-//t_list	*ft_lstnew_generic(size_t lst_sizse, size_t content_size);
-
 static t_token	*insert_tokens(t_token *t, t_token *insert_lst);
 
 int	new_token_for_each_field(char **fields, t_token **t)
@@ -27,21 +25,16 @@ int	new_token_for_each_field(char **fields, t_token **t)
 	i = 0;
 	while (fields[i])
 	{
-		if (fields[i][0])
-		{
-			insert_lst->next = (t_token *)ft_lstnew_generic(sizeof(t_token), 0);
-			insert_lst = insert_lst->next;
-			if (!insert_lst)
-			{//todo wrap
-				perror("insert_token_for_each_field() error");
-				ft_free_2d_arr(fields);
-				return ((int)ft_lstclear((t_list **)&head.next, NULL));
-			}
-			insert_lst->content = fields[i];
-			insert_lst->id = T_WORD;
+		insert_lst->next = ft_lstnew_generic(sizeof(t_token), 0);
+		insert_lst = insert_lst->next;
+		if (!insert_lst)
+		{//todo wrap
+			perror("insert_token_for_each_field() error");
+			ft_free_2d_arr(fields);
+			return ((int)ft_lstclear((t_list **)&head.next, NULL));
 		}
-		else
-			free(fields[i]);
+		insert_lst->content = fields[i];
+		insert_lst->id = T_WORD;
 		i++;
 	}
 	free(fields);
diff --git a/srcs/parsing/expansions/rejoin_after_expand.c b/srcs/parsing/expansions/rejoin_after_expand.c
index c56c98b..917b921 100644
--- a/srcs/parsing/expansions/rejoin_after_expand.c
+++ b/srcs/parsing/expansions/rejoin_after_expand.c
@@ -18,12 +18,7 @@ char	*rejoin_after_expand(t_list *expand_lst)
 	char	*result;
 
 	head = expand_lst;
-	result = ft_calloc(1, 1);
-	if (!result)
-	{//todo wrap
-		perror("rejoin_after_expand() error");
-		return (ft_lstclear(&head, free));		
-	}
+	result = NULL;
 	while (expand_lst)
 	{
 		result = ft_strjoinfree_s1(result, expand_lst->content);
diff --git a/srcs/parsing/expansions/words_expansions.c b/srcs/parsing/expansions/words_expansions.c
index 0b20e98..58e58fe 100644
--- a/srcs/parsing/expansions/words_expansions.c
+++ b/srcs/parsing/expansions/words_expansions.c
@@ -6,13 +6,12 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/11/07 02:01:33 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/02 15:46:31 by hulamy           ###   ########.fr       */
+/*   Updated: 2021/12/10 10:27:01 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "minishell.h"
 
-//t_list	*ft_lstnew_generic(size_t lst_sizse, size_t content_size);
 t_list	*expand_token(char *content);
 char	*rejoin_after_expand(t_list *expand_lst);
 int		new_token_for_each_field(char **fields, t_token **t);
diff --git a/srcs/parsing/parsing.c b/srcs/parsing/parsing.c
index 5adbe76..6234c12 100644
--- a/srcs/parsing/parsing.c
+++ b/srcs/parsing/parsing.c
@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/24 10:52:40 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/05 14:02:10 by hulamy           ###   ########.fr       */
+/*   Updated: 2021/12/10 10:26:31 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -78,7 +78,7 @@ t_cmd	**parsing(t_token *token_list)
 	// Struct CMD fill
 	if (!pipeline_fill_argv(token_list, pipeline))
 		return (ft_retp_free(NULL, &pipeline, (t_free_f)free_pipeline));
-//	print_pipeline(pipeline);
+	//print_pipeline(pipeline);
 	
 	return (pipeline);
 }
diff --git a/srcs/parsing/redirections/here_doc.c b/srcs/parsing/redirections/here_doc.c
index a8daf1d..31ec976 100644
--- a/srcs/parsing/redirections/here_doc.c
+++ b/srcs/parsing/redirections/here_doc.c
@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/11/11 18:46:43 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/05 17:42:35 by hulamy           ###   ########.fr       */
+/*   Updated: 2021/12/10 10:25:54 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -25,9 +25,6 @@ int	here_doc(char *delimiter)
 	and the here-document lines shall not be expanded.
 	Otherwise, the delimiter shall be the word itself. */
 	// TODO : A voir si on fait les expansions de variables dans le here_doc.
-	// implementer une gestion des signaux pour here_doc (verifier comportement bash et doc POSIX).
-	// Peut-être remplacer gnl() par readline() pour avoir une gestion correct
-	// du terminal (actuellement l'affichage lors du changement de ligne est foireux).
 	int	here_doc;
 	int	ret;
 
@@ -101,7 +98,7 @@ static int	here_doc_write(char *delimiter, int doc_fd)
 			ft_putstr_fd(" delimited by end-of-file (wanted `", 2);
 			ft_putstr_fd(delimiter, 2);
 			ft_putstr_fd("')\n", 2);
-			return (-1);
+			return (0);
 		}
 		if (ft_strncmp(line, delimiter, ft_strlen(line) + 1) == 0) // Ou ft_strlen(delimiter) + 1 ? Ça devrais être identique et ça peux se calculer une seul fois.
 			break ;
diff --git a/srcs/parsing/redirections/redirections.c b/srcs/parsing/redirections/redirections.c
index 210900a..1754daf 100644
--- a/srcs/parsing/redirections/redirections.c
+++ b/srcs/parsing/redirections/redirections.c
@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/11/11 18:46:43 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/05 14:00:22 by hulamy           ###   ########.fr       */
+/*   Updated: 2021/12/10 10:25:34 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -37,7 +37,7 @@ int	redirections(t_token *t, t_cmd **pipeline)
 					return (0);
 			}
 		}
-		else if (t->id == '|')
+		if (t->id == '|')
 			i++;
 		t = t->next;
 	}
@@ -72,7 +72,10 @@ static int	redirect_cmd_input(t_token *t, t_cmd *cmd)
 			cmd->error = EXIT_REDIRECTION;
 		}
 		else if (cmd->fd_in > EXIT_SIGNAL)
+		{
+			cmd->fd_in = 0;
 			return (0);
+		}
 	}
 	return (1);
 }
diff --git a/srcs/retrieve_path.c b/srcs/retrieve_path.c
new file mode 100644
index 0000000..27ee2d2
--- /dev/null
+++ b/srcs/retrieve_path.c
@@ -0,0 +1,27 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   retrieve_path.c                                    :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/10/08 09:22:12 by lperrey           #+#    #+#             */
+/*   Updated: 2021/12/08 06:27:23 by lperrey          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+
+char	**retrieve_path(void)
+{
+	char	*path;
+	char	**path_split;
+
+	path = getenv("PATH");
+	if (!path)
+		return (ft_retp_print(NULL, "minishell: Warning, $PATH not set\n", 2));
+	path_split = ft_split(path, ':');
+	if (!path_split)
+		return (ft_retp_perror(NULL, "retrieve_path()"));
+	return (path_split);
+}
diff --git a/srcs/shell_loop.c b/srcs/shell_loop.c
index 77b902a..12b6e93 100644
--- a/srcs/shell_loop.c
+++ b/srcs/shell_loop.c
@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/04 05:59:26 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/05 14:15:18 by hulamy           ###   ########.fr       */
+/*   Updated: 2021/12/10 10:23:40 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -53,7 +53,7 @@ static char	*read_input(char *prompt, t_all *c)
 	sigaction(SIGINT, &signal_behaviour, NULL);
 	if (!line_input)
 	{
-		write(2, "exit\n", 5);
+		write(STDERR_FILENO, "exit\n", 5);
 		exit_free(c, get_last_exit_status());
 	}
 	return (line_input);
diff --git a/srcs/signals.c b/srcs/signals.c
index 61445b6..e21e689 100644
--- a/srcs/signals.c
+++ b/srcs/signals.c
@@ -14,33 +14,25 @@
 
 void	sigint_handler_interactive(int signum)
 {
-	(void)signum;
 	write(1, "\n", 1);
 	rl_on_new_line();
 	rl_replace_line("", 1);
 	rl_redisplay();
+	set_last_exit_status(EXIT_SIGNAL + signum);
 }
 
 void	sigint_handler_heredoc(int signum)
 {
 	(void)signum;
-	g_switch_heredoc_sigint = 1;
 	rl_done = 1;
-//	write (1, rl_line_buffer, ft_strlen(rl_line_buffer) + 1);
-//	rl_line_buffer = "\004";
-//	write(1, "\004", 1);
-//	rl_on_new_line();
-//	rl_replace_line((char *)NULL, 1);
-//	rl_replace_line("\004", 1);
-//	rl_replace_line("", 1);
-//	rl_redisplay();
+	g_switch_heredoc_sigint = 1;
 }
 
-int set_signals_handling(struct sigaction *signal_behaviour)
+void	set_signals_behaviour(void)
 {
-	signal_behaviour->sa_handler = sigint_handler_interactive;
-	sigaction(SIGINT, signal_behaviour, NULL);
-	signal_behaviour->sa_handler = SIG_IGN;
-	sigaction(SIGQUIT, signal_behaviour, NULL);
-	return (1);
+	struct sigaction	signal_behaviour;
+
+	ft_bzero(&signal_behaviour, sizeof signal_behaviour);
+	signal_behaviour.sa_handler = SIG_IGN;
+	sigaction(SIGQUIT, &signal_behaviour, NULL);
 }