diff --git a/.gitignore b/.gitignore
index b2e009d..a1a6a9c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,5 @@ memo
 memo.txt
 minishell
 *.zip
+arg_test
+osef_temp
diff --git a/Makefile b/Makefile
index 3068941..b239c10 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ CC = clang
 CFLAGS = -Wall -Wextra -Werror $(INCLUDES) -g
 
 VPATH  = $(DIR_SRCS)
-DIR_SRCS = srcs srcs/builtins
+DIR_SRCS = srcs srcs/builtins srcs/parsing
 
 INCLUDES = -I$(HEADERS_D) -I$(LIBFT_D)
 
@@ -22,7 +22,11 @@ LIBFT_D = ./libft
 LIBFT = $(LIBFT_D)/libft.a
 
 SRCS =	main.c init.c free.c generic.c \
-		env.c exit.c
+		shell_loop.c \
+		lexing.c \
+		parsing.c \
+		valid_syntax.c valid_pipeline.c valid_command.c valid_io_redirect.c \
+		env.c exit.c echo.c 
 
 DIR_OBJS = builds
 OBJS = $(SRCS:%.c=$(DIR_OBJS)/%.o)
diff --git a/headers/minishell_prototypes.h b/headers/minishell_prototypes.h
index 9ac275f..f6b043f 100644
--- a/headers/minishell_prototypes.h
+++ b/headers/minishell_prototypes.h
@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/08 02:59:58 by lperrey           #+#    #+#             */
-/*   Updated: 2021/10/10 23:55:14 by lperrey          ###   ########.fr       */
+/*   Updated: 2021/10/24 19:20:09 by lperrey          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -16,9 +16,22 @@
 // Init
 int		init(t_all *c, char *envp[]);
 
+// Shell loop
+void	shell_loop(t_all *c);
+
+// Lexer
+t_token	*input_to_tokens(char *input);
+
+// Parser
+t_cmd	**parsing(t_token *token_list);
+int		valid_syntax(t_token *token_list);
+int		valid_token(t_token **token_list, enum e_token_id token_id);
+int		valid_command_separator(const t_token *token_list);
+
 // Builtins
 int		builtin_env(int argc, char *argv[], t_all *c);
 int		builtin_exit(int argc, char *argv[], t_all *c);
+int		builtin_echo(int argc, char *argv[], t_all *c);
 
 // Free
 int		free_exit(t_all *c, int exit_status);
@@ -27,5 +40,10 @@ int		free_exit(t_all *c, int exit_status);
 char	*ft_strjoinfree(char *s1, char *s2);
 char	*ft_strjoinfree_s1(char *s1, const char *s2);
 char	*ft_strjoinfree_s2(const char *s1, char *s2);
+void	ft_lstprint(t_list *lst, int fd);
+int		ft_isinset_str(char *str, char *set);
+size_t	ft_2d_arrlen(void *ptr); // Replace ft_arrlen()
+void	*ft_dup_2d_arr(void *ptr);
+void	*ft_resize_2d_arr(void *ptr, size_t add_nbr);
 
 #endif
diff --git a/headers/minishell_structs.h b/headers/minishell_structs.h
index 6bb2bc6..183ffba 100644
--- a/headers/minishell_structs.h
+++ b/headers/minishell_structs.h
@@ -6,18 +6,51 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/08 02:35:52 by lperrey           #+#    #+#             */
-/*   Updated: 2021/10/10 05:39:09 by lperrey          ###   ########.fr       */
+/*   Updated: 2021/10/24 19:18:28 by lperrey          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #ifndef MINISHELL_STRUCTS_H
 # define MINISHELL_STRUCTS_H
 
+enum	e_token_id
+{
+	T_TOKEN = 0,
+	T_LESS = '<',
+	T_GREAT = '>',
+	T_PIPE = '|',
+	T_DLESS, //'<<'
+	T_DGREAT, //'>>'
+	T_WORD
+};
+
+typedef struct s_token
+{
+	char			*content;
+	struct s_token	*next;
+	enum e_token_id	id;
+}				t_token;
+
+struct s_all;
+typedef int (*t_builtin_ptr)(int,char **,struct s_all *);
+
+typedef struct s_cmd
+{
+	char			**argv;
+	pid_t			pid;
+	t_builtin_ptr	*builtin_command;
+	int				fd_in;
+	int				fd_out;
+}				t_cmd;
+
 typedef struct s_all
 {
+	t_cmd	**cmd_arr;
 	char	**envp;
 	char	*prompt_base;
 	char	*prompt;
+	t_token	*token_list;
+	int		last_exit_status;
 }				t_all;
 
 #endif
diff --git a/headers/minishell_user_macro.h b/headers/minishell_user_macro.h
index 7b026e5..177e010 100644
--- a/headers/minishell_user_macro.h
+++ b/headers/minishell_user_macro.h
@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/10 03:36:37 by lperrey           #+#    #+#             */
-/*   Updated: 2021/10/10 20:58:28 by lperrey          ###   ########.fr       */
+/*   Updated: 2021/10/19 20:30:34 by lperrey          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -15,7 +15,7 @@
 
 # include "minishell_macro.h"
 
-# define U_PROMPT_END	PROMPT_EURO
+# define U_PROMPT_END	PROMPT_CHEVRON
 # define U_DEFAULT_USER	"NoUser"
 # define U_DEFAULT_NAME	"NoName"
 
diff --git a/parsing.txt b/parsing.txt
new file mode 100644
index 0000000..c53ecb8
--- /dev/null
+++ b/parsing.txt
@@ -0,0 +1,102 @@
+https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_10_02
+
+/* -------------------------------------------------------
+   The grammar symbols
+   ------------------------------------------------------- */
+%token  WORD
+%token  LESS // '<'
+%token  GREAT // '>'
+%token  DLESS // '<<'
+%token  DGREAT // '>>'
+%token  PIPE // '|'
+
+/* -------------------------------------------------------
+   The Simplified Grammar
+   ------------------------------------------------------- */
+%start program
+%%
+pipeline         :                   command
+                 | pipe_sequence '|' command
+                 ;
+command          : cmd_prefix cmd_name cmd_suffix
+                 | cmd_prefix cmd_name
+                 | cmd_name cmd_suffix
+                 | cmd_name
+                 ;
+cmd_name         : WORD                   // Apply rule 7a
+                 ;
+cmd_prefix       :            io_redirect
+                 | cmd_prefix io_redirect
+                 ;
+cmd_suffix       :            io_redirect
+                 | cmd_suffix io_redirect
+                 |            WORD
+                 | cmd_suffix WORD
+                 ;
+io_redirect      :           io_file
+                 |           io_here
+                 ;
+io_file          : '<'       filename
+                 | LESSAND   filename
+                 | '>'       filename
+                 | GREATAND  filename
+                 | DGREAT    filename
+                 | LESSGREAT filename
+                 | CLOBBER   filename
+                 ;
+filename         : WORD                      // Apply rule 2
+                 ;
+io_here          : DLESS     here_end
+                 ;
+here_end         : WORD                      // Apply rule 3
+                 ;
+
+
+
+/* -------------------------------------------------------
+   The Grammar
+   ------------------------------------------------------- */
+%start program
+%%
+pipeline         : pipe_sequence
+                 ;
+pipe_sequence    :                   command
+                 | pipe_sequence '|' command
+                 ;
+command          : simple_command
+                 ;
+simple_command   : cmd_prefix cmd_word cmd_suffix
+                 | cmd_prefix cmd_word
+                 | cmd_prefix
+                 | cmd_name cmd_suffix
+                 | cmd_name
+                 ;
+cmd_name         : WORD                   /* Apply rule 7a */
+                 ;
+cmd_word         : WORD                   /* Apply rule 7b */
+                 ;
+cmd_prefix       :            io_redirect
+                 | cmd_prefix io_redirect
+                 ;
+cmd_suffix       :            io_redirect
+                 | cmd_suffix io_redirect
+                 |            WORD
+                 | cmd_suffix WORD
+                 ;
+io_redirect      :           io_file
+                 |           io_here
+                 ;
+io_file          : '<'       filename
+                 | LESSAND   filename
+                 | '>'       filename
+                 | GREATAND  filename
+                 | DGREAT    filename
+                 | LESSGREAT filename
+                 | CLOBBER   filename
+                 ;
+filename         : WORD                      /* Apply rule 2 */
+                 ;
+io_here          : DLESS     here_end
+                 ;
+here_end         : WORD                      /* Apply rule 3 */
+                 ;
diff --git a/srcs/builtins/echo.c b/srcs/builtins/echo.c
new file mode 100644
index 0000000..4a17e6d
--- /dev/null
+++ b/srcs/builtins/echo.c
@@ -0,0 +1,47 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   echo.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/10/21 16:37:44 by lperrey           #+#    #+#             */
+/*   Updated: 2021/10/21 20:22:22 by lperrey          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+
+enum	e_echo_options
+{
+	BIT_N = 01,
+};
+
+int	builtin_echo(int argc, char *argv[], t_all *c)
+{
+	int	i;
+	int	options;
+
+	(void)argc;
+	(void)c;
+	options = 0;
+	i = 1;
+	while (argv[i] && argv[i][0] == '-')
+	{
+		if (ft_isinset_str(&argv[i][1], "n"))
+			options = options | BIT_N;
+		else
+			break ;
+		i++;
+	}
+	while (argv[i])
+	{
+		ft_putstr_fd(argv[i], 1);
+		i++;
+		if (argv[i])
+			write(1, " ", 1);
+	}
+	if ((options & BIT_N) == 0)
+		write(1, "\n", 1);
+	return (0);
+}
diff --git a/srcs/builtins/exit.c b/srcs/builtins/exit.c
index 2a3fd88..71e09f7 100644
--- a/srcs/builtins/exit.c
+++ b/srcs/builtins/exit.c
@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/10 05:01:22 by lperrey           #+#    #+#             */
-/*   Updated: 2021/10/11 01:50:53 by lperrey          ###   ########.fr       */
+/*   Updated: 2021/10/22 14:49:01 by lperrey          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -17,7 +17,7 @@ int	builtin_exit(int argc, char *argv[], t_all *c) // WIP
 	unsigned char	status;
 	int				i;
 
-	status = 0;
+	status = c->last_exit_status;
 	if (argc > 2)
 		return (ft_reti_print(1, "exit: too many arguments\n", 2));
 	if (argc == 2)
diff --git a/srcs/free.c b/srcs/free.c
index ce0826e..b2b6468 100644
--- a/srcs/free.c
+++ b/srcs/free.c
@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/10 23:53:17 by lperrey           #+#    #+#             */
-/*   Updated: 2021/10/10 23:59:25 by lperrey          ###   ########.fr       */
+/*   Updated: 2021/10/22 13:35:33 by lperrey          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -16,5 +16,7 @@ int	free_exit(t_all *c, int exit_status)
 {
 	free(c->prompt_base);
 	free(c->prompt);
+	ft_lstclear((t_list **)&c->token_list, free); // a voir avec Hugo, il y a un truc qui me semble superflu dans la fonction
 	exit(exit_status);
+	ft_free_2d_arr(c->envp);
 }
diff --git a/srcs/generic.c b/srcs/generic.c
index ab88730..43f2b9c 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: 2021/10/08 09:28:49 by lperrey          ###   ########.fr       */
+/*   Updated: 2021/10/23 15:19:07 by lperrey          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -39,3 +39,86 @@ char	*ft_strjoinfree_s2(const char *s1, char *s2)
 	free(s2);
 	return (str);
 }
+
+void	ft_lstprint(t_list *lst, int fd)
+{
+	while (lst)
+	{
+		ft_putendl_fd(lst->content, fd);
+		lst = lst->next;
+	}
+}
+
+int	ft_isinset_str(char *str, char *set)
+{
+	size_t	i;
+	size_t	i_set;
+	int		valid;
+
+	i = 0;
+	while (str[i])
+	{
+		valid = 0;
+		i_set = 0;
+		while (set[i_set] && !valid)
+		{
+			if (str[i] == set[i_set])
+				valid = 1;
+			i_set++;
+		}
+		if (!valid)
+			return (0);
+		i++;
+	}
+	return (i);
+}
+
+size_t	ft_2d_arrlen(void *ptr) // Replace ft_arrlen()
+{
+	size_t	len;
+	char	**arr;
+
+	arr = (char **)ptr;
+	len = 0;
+	while (arr[len] != NULL)
+		len++;
+	return (len);
+}
+
+void	*ft_dup_2d_arr(void *ptr)
+{
+	unsigned int	i;
+	char			**arr;
+	char			**new_arr;
+
+	new_arr = malloc((ft_2d_arrlen(ptr) + 1) * sizeof (void *));
+	if (!new_arr)
+		return (NULL);
+	arr = (char **)ptr;
+	i = 0;
+	while (arr[i])
+	{
+		new_arr[i] = arr[i];
+		i++;
+	}
+	new_arr[i] = NULL;
+	return (new_arr);
+}
+
+void	*ft_resize_2d_arr(void *ptr, size_t add_nbr)
+{
+	unsigned int	i;
+	char			**arr;
+	char			**new_arr;
+
+	new_arr = ft_calloc(ft_2d_arrlen(ptr) + add_nbr + 1, sizeof (void *));
+	arr = (char **)ptr;
+	i = 0;
+	while (arr[i])
+	{
+		new_arr[i] = arr[i];
+		i++;
+	}
+	free(arr);
+	return (new_arr);
+}
diff --git a/srcs/init.c b/srcs/init.c
index 6acedc0..6264069 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: 2021/10/10 21:56:33 by lperrey          ###   ########.fr       */
+/*   Updated: 2021/10/23 16:04:03 by lperrey          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -18,13 +18,15 @@ static char	*init_prompt(char *prompt_base);
 int		init(t_all *c, char *envp[])
 {
 	ft_bzero(c, sizeof *c);
-	c->envp = envp;
+	c->envp = ft_dup_2d_arr(envp);
+	if (!c->envp)
+		return (ft_reti_perror(0, "ft_dup_2d_arr(envp) error"));
 	c->prompt_base = init_prompt_base();
 	if (!c->prompt_base)
-		return (ft_reti_perror(0, "init_prompt_base() fail"));
+		return (ft_reti_perror(0, "init_prompt_base() error"));
 	c->prompt = init_prompt(c->prompt_base);
 	if (!c->prompt)
-		return (ft_reti_perror(0, "init_prompt() fail"));
+		return (ft_reti_perror(0, "init_prompt() error"));
 	return (1);
 }
 
diff --git a/srcs/lexing.c b/srcs/lexing.c
new file mode 100644
index 0000000..5aa6b96
--- /dev/null
+++ b/srcs/lexing.c
@@ -0,0 +1,193 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   lexing.c                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/10/19 08:38:55 by lperrey           #+#    #+#             */
+/*   Updated: 2021/10/24 19:53:40 by lperrey          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+static t_token	*alloc_token(size_t content_len);
+static int		tokenize_input(t_token *t, char *input, size_t input_len);
+static int		fill_token(t_token *t, char *input, int *i, int *t_i);
+static int		check_operators(t_token *t, char *input, int *i, int *t_i);
+
+enum	e_in_quote_state
+{
+	NOT_IN = 0,
+	IN_QUOTES = '\'',
+	IN_DQUOTES = '\"'
+};
+
+enum	e_fill_token_return
+{
+	CONTINUE_TOKEN = 1,
+	DELIMITE_TOKEN
+};
+
+t_token	*input_to_tokens(char *input)
+{
+	t_token	*t_head;
+	size_t	input_len;
+	
+	input_len = ft_strlen(input);
+	t_head = alloc_token(input_len);
+	if (!t_head)
+		return (ft_retp_perror(NULL, "alloc_token() error"));
+	if (!tokenize_input(t_head, input, input_len))
+		return (ft_lstclear((t_list **)&t_head, free));
+	return (t_head);
+}
+
+// TODO : Fix final space saved after a pipe like in "cmd | "
+// "cmd | " should behave like "cmd |"
+static int	tokenize_input(t_token *t, char *input, size_t input_len)
+{
+	int	i;
+	int	t_i;
+
+	i = 0;
+	t_i = 0;
+	while (input[i])
+	{
+		if (fill_token(t, input, &i, &t_i) == DELIMITE_TOKEN && input[i] && t_i)
+		{
+			if (!t->id)
+				t->id = T_WORD;
+			t->next = alloc_token(input_len - i);
+			if (!t->next)
+				return (ft_reti_perror(0, "alloc_token() error"));
+			t = t->next;
+			t_i = 0;
+		}
+	}
+	if (!t->id && t_i) // Fix parser syntax, but last elem must still be free
+		t->id = T_WORD;	
+/* 	if (!t->id) 
+		t->id = T_WORD;	 */
+	return (1);
+}
+
+static int	fill_token(t_token *t, char *input, int *i, int *t_i)
+{
+	static int	in_quotes = 0;
+
+	// operators
+	if (!in_quotes)
+	{
+		if (check_operators(t, input, i, t_i) == DELIMITE_TOKEN)
+			return (DELIMITE_TOKEN);
+	}
+	// quoting
+	if (input[*i] == '\'' && in_quotes != IN_DQUOTES)
+	{
+		t->content[(*t_i)++] = input[(*i)++];
+		if (in_quotes == IN_QUOTES)
+			in_quotes = 0;
+		else if (ft_strchr(&input[*i], '\'')) // if closed quotes
+			in_quotes = IN_QUOTES;
+		return (CONTINUE_TOKEN);
+	}
+	else if (input[*i] == '\"' && in_quotes != IN_QUOTES)
+	{
+		t->content[(*t_i)++] = input[(*i)++];
+		if (in_quotes == IN_DQUOTES)
+			in_quotes = 0;
+		else if (ft_strchr(&input[*i], '\"')) // if closed dquotes
+			in_quotes = IN_DQUOTES;
+		return (CONTINUE_TOKEN);
+	}
+	// blanks
+	if (!in_quotes && (input[*i] == ' ' || input[*i] == '\t'))
+	{
+		while (input[*i] == ' ' || input[*i] == '\t')
+			(*i)++;
+		return (DELIMITE_TOKEN);
+	}
+	else
+		t->content[(*t_i)++] = input[(*i)++];
+	return (CONTINUE_TOKEN);
+}
+
+static int	check_operators(t_token *t, char *input, int *i, int *t_i)
+{
+	if (*t_i != 0 && (input[*i] == '|' || input[*i] == '<' || input[*i] == '>'))
+		return (DELIMITE_TOKEN);
+	if (input[*i] == '|')
+	{
+		t->content[(*t_i)++] = input[(*i)++];
+		t->id = T_PIPE;
+		return (DELIMITE_TOKEN);
+	}
+	else if (input[*i] == '<')
+	{
+		t->content[(*t_i)++] = input[(*i)++];
+		t->id = T_LESS;
+		if (input[*i] == '<')
+		{
+			t->content[(*t_i)++] = input[(*i)++];
+			t->id = T_DLESS;
+		}
+		return (DELIMITE_TOKEN);
+	}
+	else if (input[*i] == '>')
+	{
+		t->content[(*t_i)++] = input[(*i)++];
+		t->id = T_GREAT;
+		if (input[*i] == '>')
+		{
+			t->content[(*t_i)++] = input[(*i)++];
+			t->id = T_DGREAT;
+		}
+		return (DELIMITE_TOKEN);
+	}
+	return (CONTINUE_TOKEN);
+}
+
+static t_token	*alloc_token(size_t content_len)
+{
+	t_token	*token;
+
+	token = ft_calloc(1, sizeof *token);
+	if (!token)
+		return (NULL);
+	token->content = ft_calloc(content_len + 1, 1);
+	if (!token->content)
+		return (ft_retp_free(NULL, token, free));
+	return (token);
+}
+
+/* 
+https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_03
+1 - OK
+2 - OK
+3 - OK
+4 - OK
+5 - OK / SEMI-OSEF
+6 - OK
+7 - OK
+8 - OK
+9 - OSEF
+10 - OK
+
+*/
+
+// Doublon avec ft_lstclear()
+/* void	*free_tokens(t_token *t)
+{
+	void	*tmp;
+
+	while (t)
+	{
+		if (t->content)
+			free (t->content);
+		tmp = t;
+		t = t->next;
+		free(tmp);
+	}
+	return (NULL);
+} */
diff --git a/srcs/main.c b/srcs/main.c
index 6495efc..9a55ed0 100644
--- a/srcs/main.c
+++ b/srcs/main.c
@@ -6,59 +6,12 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/04 05:59:26 by lperrey           #+#    #+#             */
-/*   Updated: 2021/10/10 15:13:26 by hulamy           ###   ########.fr       */
+/*   Updated: 2021/10/27 14:48:03 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "minishell.h"
 
-void	shell_loop(t_all *c)
-{
-	char	*line_input;
-
-	line_input = NULL;
-	while (1)
-	{
-		if (line_input)
-			free(line_input);
-		line_input = readline(c->prompt);
-		if (line_input && *line_input)
-		{
-			if (!ft_strncmp(line_input, "env", 4)) // temp placeholder
-				builtin_env(0, NULL, c);
-			else if (!ft_strncmp(line_input, "exit", 5)) // temp placeholder
-				builtin_exit(0, NULL, c);
-			else
-				printf("echo: %s\n", line_input);
-		}
-	}
-}
-
-void	wip_test()
-{
-	char	term_desc[2048];
-	char	*term_type;
-	int		term_width;
-	int		term_height;
-	int		ret;
-	
-	term_type = getenv("TERM");
-	if (term_type == 0)
-		ft_putstr_fd("Specify a terminal type with `setenv TERM <yourtype>'.\n", 2);
-	ret = tgetent(term_desc, term_type);
-  	if (ret < 0)
-    	ft_putstr_fd("Could not access the termcap data base.\n", 2);
-	if (ret == 0)
-    	ft_putstr_fd("Terminal type `%s' is not defined.\n", 2);
-	term_height = tgetnum ("li");
-  	term_width = tgetnum ("co");
-	  /* Extract information that termcap functions use.  */
-/* 	temp = tgetstr ("pc", BUFFADDR);
-	PC = temp ? *temp : 0;
-	BC = tgetstr ("le", BUFFADDR);
-	UP = tgetstr ("up", BUFFADDR); */
-}
-
 int	main(int argc, char *argv[], char *envp[])
 {
 	t_all	c;
diff --git a/srcs/parsing/parsing.c b/srcs/parsing/parsing.c
new file mode 100644
index 0000000..49c9fd8
--- /dev/null
+++ b/srcs/parsing/parsing.c
@@ -0,0 +1,101 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   parsing.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/10/24 10:52:40 by lperrey           #+#    #+#             */
+/*   Updated: 2021/10/24 19:19:08 by lperrey          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+
+// A quoi bon un arbre binaire ? Je ne vois plus l'utilité.
+
+/* typedef struct s_binary_tree
+{
+	char					*content;
+	struct s_binary_tree	*sub;
+	struct s_binary_tree	*sibling;
+	enum e_token_id			id;
+}				t_binary_tree; */
+
+t_cmd	**parsing(t_token *token_list)
+{
+	t_cmd	**cmd_arr;
+	size_t	cmd_nbr;
+
+	(void)cmd_arr;
+	(void)cmd_nbr;
+/* 	t_binary_tree	*syntax_tree;
+	
+	syntax_tree = ft_calloc(1, sizeof *syntax_tree);
+	if (!syntax_tree)
+		return (0); //WIP ERROR */
+	
+	if (!valid_syntax(token_list))
+		return (NULL);
+	// Pipes count (determine cmd_nbr)
+		
+	// Struct CMD alloc/fill
+
+	// 2.9.1 - 2) Expansion
+
+	// 2.9.1 - 3) Redirection
+	
+	//return (cmd_arr);
+	return ((t_cmd **)1); //temp test
+}
+
+/* -------------------------------------------------------
+   The grammar symbols
+   ------------------------------------------------------- */
+/*
+%token  WORD
+%token  LESS // '<'
+%token  GREAT // '>'
+%token  DLESS // '<<'
+%token  DGREAT // '>>'
+%token  PIPE // '|'
+*/
+
+/* -------------------------------------------------------
+   The Simplified Grammar
+   ------------------------------------------------------- */
+/*
+%start program
+%%
+pipeline         :                   command
+                 | pipe_sequence '|' command
+                 ;
+command          : cmd_prefix cmd_name cmd_suffix
+                 | cmd_prefix cmd_name
+                 | cmd_name cmd_suffix
+                 | cmd_name
+                 ;
+cmd_name         : WORD                   // Apply rule 7a
+                 ;
+cmd_prefix       :            io_redirect
+                 | cmd_prefix io_redirect
+                 ;
+cmd_suffix       :            io_redirect
+                 | cmd_suffix io_redirect
+                 |            WORD
+                 | cmd_suffix WORD
+                 ;
+io_redirect      :           io_file
+                 |           io_here
+                 ;
+io_file          : '<'       filename
+                 | '>'       filename
+                 | DGREAT    filename
+                 ;
+filename         : WORD                      // Apply rule 2
+                 ;
+io_here          : DLESS     here_end
+                 ;
+here_end         : WORD                      // Apply rule 3
+                 ;
+*/
diff --git a/srcs/parsing/valid_command.c b/srcs/parsing/valid_command.c
new file mode 100644
index 0000000..4c30f2e
--- /dev/null
+++ b/srcs/parsing/valid_command.c
@@ -0,0 +1,95 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   valid_command.c                                    :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/10/24 18:52:05 by lperrey           #+#    #+#             */
+/*   Updated: 2021/10/24 19:21:28 by lperrey          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+int			valid_io_redirect(t_token **token_list);
+
+static int	valid_command_rule1(t_token **token_list);
+static int	valid_command_rule2(t_token **token_list);
+static int	valid_command_rule3(t_token **token_list);
+static int	valid_command_rule4(t_token **token_list);
+
+int	valid_command(t_token **token_list)
+{
+	t_token	*cmd_start;
+
+	cmd_start = *token_list;
+	if (valid_command_rule1(token_list))
+		return (1);
+	*token_list = cmd_start;
+	if (valid_command_rule2(token_list))
+		return (1);
+	*token_list = cmd_start;
+	if (valid_command_rule3(token_list))
+		return (1);
+	*token_list = cmd_start;
+	if (valid_command_rule4(token_list))
+		return (1);
+	return (0);
+}
+
+// cmd_prefix cmd_name cmd_suffix
+static int	valid_command_rule1(t_token **token_list)
+{
+	while (valid_io_redirect(token_list))
+	{
+		if (valid_token(token_list, T_WORD))
+		{
+			while (valid_token(token_list, T_WORD)
+				|| valid_io_redirect(token_list))
+			{
+				if (valid_command_separator(*token_list))
+					return (1);
+			}
+		}
+	}
+	return (0);
+}
+
+// cmd_prefix cmd_name
+static int	valid_command_rule2(t_token **token_list)
+{
+	while (valid_io_redirect(token_list))
+	{
+		if (valid_token(token_list, T_WORD))
+		{
+			if (valid_command_separator(*token_list))
+				return (1);
+		}
+	}
+	return (0);
+}
+
+// cmd_name cmd_suffix
+static int	valid_command_rule3(t_token **token_list)
+{
+	if (valid_token(token_list, T_WORD))
+	{
+		while (valid_token(token_list, T_WORD) || valid_io_redirect(token_list))
+		{
+			if (valid_command_separator(*token_list))
+				return (1);
+		}
+	}
+	return (0);
+}
+
+// cmd_name
+static int	valid_command_rule4(t_token **token_list)
+{
+	if (valid_token(token_list, T_WORD))
+	{
+		if (valid_command_separator(*token_list))
+			return (1);
+	}
+	return (0);
+}
diff --git a/srcs/parsing/valid_io_redirect.c b/srcs/parsing/valid_io_redirect.c
new file mode 100644
index 0000000..8338b65
--- /dev/null
+++ b/srcs/parsing/valid_io_redirect.c
@@ -0,0 +1,44 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   valid_io_redirect.c                                :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/10/24 18:52:42 by lperrey           #+#    #+#             */
+/*   Updated: 2021/10/24 19:21:35 by lperrey          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+
+static int	valid_io_file(t_token **token_list);
+static int	valid_io_here(t_token **token_list);
+
+int	valid_io_redirect(t_token **token_list)
+{
+	if (valid_io_file(token_list) || valid_io_here(token_list))
+		return (1);
+	return (0);
+}
+
+static int	valid_io_file(t_token **token_list)
+{
+	if (valid_token(token_list, '<') || valid_token(token_list, '>')
+		|| valid_token(token_list, T_DGREAT))
+	{
+		if (valid_token(token_list, T_WORD))
+			return (1);
+	}
+	return (0);
+}
+
+static int	valid_io_here(t_token **token_list)
+{
+	if (valid_token(token_list, T_DLESS))
+	{
+		if (valid_token(token_list, T_WORD))
+			return (1);
+	}
+	return (0);
+}
diff --git a/srcs/parsing/valid_pipeline.c b/srcs/parsing/valid_pipeline.c
new file mode 100644
index 0000000..cda0454
--- /dev/null
+++ b/srcs/parsing/valid_pipeline.c
@@ -0,0 +1,27 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   valid_pipeline.c                                   :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/10/24 18:51:35 by lperrey           #+#    #+#             */
+/*   Updated: 2021/10/24 19:35:16 by lperrey          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+int	valid_command(t_token **token_list);
+
+int	valid_pipeline(t_token **token_list)
+{
+	while (valid_command(token_list))
+	{
+		if (*token_list == NULL)
+			return (1);
+		else if ((*token_list)->id != '|' || (*token_list)->next == NULL)
+			return (0);
+		valid_token(token_list, '|');
+	}
+	return (0);
+}
diff --git a/srcs/parsing/valid_syntax.c b/srcs/parsing/valid_syntax.c
new file mode 100644
index 0000000..0fd9f2f
--- /dev/null
+++ b/srcs/parsing/valid_syntax.c
@@ -0,0 +1,44 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   valid_syntax.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/10/24 13:01:10 by lperrey           #+#    #+#             */
+/*   Updated: 2021/10/24 19:40:23 by lperrey          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+int	valid_pipeline(t_token **token_list);
+
+int	valid_syntax(t_token *token_list)
+{
+	if (valid_pipeline(&token_list))
+		return (1);
+	else
+	{	// WIP ERROR
+		ft_putstr_fd("minishell: syntax error near unexpected token \'", 2);
+		ft_putstr_fd(token_list->content, 2);
+		ft_putstr_fd("\'\n", 2);
+	}
+	return (0);
+}
+
+int	valid_token(t_token **token_list, enum e_token_id token_id)
+{
+	if (*token_list != NULL && (*token_list)->id == token_id)
+	{
+		*token_list = (*token_list)->next;
+		return (1);
+	}
+	return (0);
+}
+
+int	valid_command_separator(const t_token *token_list)
+{
+	if (token_list == NULL || token_list->id == '|')
+		return (1);
+	return (0);
+}
diff --git a/srcs/shell_loop.c b/srcs/shell_loop.c
new file mode 100644
index 0000000..2aa41f6
--- /dev/null
+++ b/srcs/shell_loop.c
@@ -0,0 +1,96 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   shell_loop.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/10/04 05:59:26 by lperrey           #+#    #+#             */
+/*   Updated: 2021/10/24 19:17:03 by lperrey          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+
+static char	**tokens_list_to_argv(t_token *t); // temp test
+
+void	shell_loop(t_all *c)
+{
+	char	*line_input;
+
+	line_input = NULL;
+	while (1)
+	{
+		if (line_input)
+			free(line_input);
+		line_input = readline(c->prompt);
+		if (line_input && *line_input)
+		{
+			add_history(line_input);
+			c->token_list = input_to_tokens(line_input);
+			
+			// EXEC_PIPES_AND_CO()
+
+			// temp placeholder
+			if (ft_strncmp(c->token_list->content, "env", 4) == 0)
+				builtin_env(0, NULL, c);
+			else if (ft_strncmp(c->token_list->content, "exit", 5) == 0)
+				builtin_exit(0, NULL, c);
+			else if (ft_strncmp(c->token_list->content, "echo", 5) == 0)
+				builtin_echo(ft_lstsize((t_list *)c->token_list) + 1, tokens_list_to_argv(c->token_list), c);
+			else
+			{
+				if (parsing(c->token_list))
+					ft_putstr_fd("Syntax OK:\n-----------\n", 1);
+				else
+					ft_putstr_fd("Syntax KO:\n-----------\n", 1);
+					
+				ft_putstr_fd("TOKENS LIST :\n-----------\n", 1);
+				ft_lstprint((t_list *)c->token_list, 1);
+				ft_lstclear((t_list **)&c->token_list, free);
+			}
+		}
+	}
+}
+
+static char	**tokens_list_to_argv(t_token *t) // temp test
+{
+	size_t	i;
+	char	**argv;
+
+	i = ft_lstsize((t_list *)t);
+	argv = ft_calloc(i + 1, sizeof(char*));
+	i = 0;
+	while (t)
+	{
+		argv[i] = t->content;
+		i++;
+		t = t->next;
+	}
+	return (argv);
+}
+
+void	wip_test()
+{
+	char	term_desc[2048];
+	char	*term_type;
+	int		term_width;
+	int		term_height;
+	int		ret;
+	
+	term_type = getenv("TERM");
+	if (term_type == 0)
+		ft_putstr_fd("Specify a terminal type with `setenv TERM <yourtype>'.\n", 2);
+	ret = tgetent(term_desc, term_type);
+  	if (ret < 0)
+    	ft_putstr_fd("Could not access the termcap data base.\n", 2);
+	if (ret == 0)
+    	ft_putstr_fd("Terminal type `%s' is not defined.\n", 2);
+	term_height = tgetnum ("li");
+  	term_width = tgetnum ("co");
+	  /* Extract information that termcap functions use.  */
+/* 	temp = tgetstr ("pc", BUFFADDR);
+	PC = temp ? *temp : 0;
+	BC = tgetstr ("le", BUFFADDR);
+	UP = tgetstr ("up", BUFFADDR); */
+}
diff --git a/tests/trop_de_pipes.sh b/tests/trop_de_pipes.sh
new file mode 100644
index 0000000..6a5bcc2
--- /dev/null
+++ b/tests/trop_de_pipes.sh
@@ -0,0 +1,7 @@
+
+# Pipes OK
+wc Makefile | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | wc | 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