diff --git a/env.c b/env.c
new file mode 100644
index 0000000..3fb243c
--- /dev/null
+++ b/env.c
@@ -0,0 +1,242 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   env.c                                              :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: erey-bet <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/02/02 14:39:56 by erey-bet          #+#    #+#             */
+/*   Updated: 2023/02/16 15:13:35 by cchauvet         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+
+int	get_index(char *s, char c)
+{
+	int	i;
+
+	i = -1;
+	while (s[++i])
+		if (s[i] == c)
+			return (i);
+	return (-1);
+}
+
+void	print_export(t_list **head, int fd)
+{
+	t_list	*current;
+
+	current = *head;
+	while (current->next != NULL)
+	{
+		write(fd, "declare -x ", 11);
+		ft_putstr_fd(((t_env*)(current->content))->key, fd);
+		ft_putstr_fd("=", fd);
+		write(fd, "\"", 1);
+		ft_putstr_fd(((t_env*)(current->content))->value, fd);
+		write(fd, "\"\n", 2);
+		current = current->next;
+	}
+}
+
+void	print_env(t_list **head, int fd)
+{
+	t_list	*current;
+
+	current = *head;
+	while (current->next != NULL)
+	{
+		ft_putstr_fd(((t_env*)(current->content))->key, fd);
+		ft_putstr_fd("=", fd);
+		ft_putstr_fd(((t_env*)(current->content))->value, fd);
+		write(fd, "\n", 1);
+		current = current->next;
+	}
+}
+
+int	strcmp_alphabet(char *s1, char *s2)
+{
+	int	i;
+
+	if (!s1 || !s2)
+		return (-2);
+	i = 0;
+	while (s1[i] && s2[i])
+	{
+		if (s1[i] < s2[i])
+			return (0);
+		else if (s1[i] > s2[i])
+			return (1);
+		i++;
+	}
+	return (-1);
+}
+
+void	ft_double_swap(void *a, void *b)
+{
+	void	*c;
+
+	c = a;
+	a = b;
+	b = c;
+}
+
+void	exchange(void *a, void *b, void *c)
+{
+	void	*d;
+
+	d = a;
+	a = b;
+	b = c;
+	c = d;
+}
+
+char	*get_value(char *str)
+{
+	char	*s;
+	int		i;
+	int		start;
+
+	s = ft_calloc(ft_strlen(str), sizeof(char));
+	start = get_index(str, '=');
+	i = start;
+	while (str[++i])
+		s[i - start - 1] = str[i];
+	return (s);
+}
+
+void	env_del(void *ptr)
+{
+	t_env	*content;
+
+	content = ptr;
+	free(content->key);
+	free(content->value);
+}
+
+char	*get_key(char *str)
+{
+	char	*s;
+	int		i;
+
+	s = ft_calloc(ft_strlen(str), sizeof(char));
+	i = -1;
+	while (str[++i] != '=')
+		s[i] = str[i];
+	return (s);
+}
+
+void	swap_env_3(void **a, void **b, void **c)
+{
+	void	*d;
+
+	d = *a;
+	*a = *b;
+	*b = *c;
+	*c = d;
+}
+
+void	swap_env(void **a, void **b)
+{
+	void	*c;
+
+	c = *a;
+	*a = *b;
+	*b = c;
+}
+
+void	add_sort(t_list **head, t_env *var)
+{
+	t_list	*current;
+	t_env	*last;
+
+	current = *head;
+	while (current->next != NULL && strcmp_alphabet(var->key, ((t_env*)(current->content))->key) != 0)
+		current = current->next;
+	if (current->content == NULL)
+		current->content = var;
+	else
+	{
+		last = NULL;
+		swap_env_3((void **)&last, &current->content, (void **)&var);
+		while (current->next != NULL)
+		{
+			current = current->next;
+			swap_env(&current->content, (void **)&last);
+		}
+	}
+	if (current->next == NULL)
+		current->next = ft_calloc(1, sizeof(t_list));
+}
+
+char	*get_value_by_key(char *key, t_list **head)
+{
+	t_list	*current;
+
+	current = *head;
+	while (current->next != NULL)
+	{
+		if (ft_strcmp(((t_env *)current->content)->key, key) == 0)
+			return (((t_env *)current->content)->value);
+		current = current->next;
+	}
+	return (NULL);
+}
+
+int	set_value_by_key(char *key, char *value, t_list **head)
+{
+	t_list	*current;
+
+	current = *head;
+	while (current->next != NULL)
+	{
+		if (ft_strcmp(((t_env *)current->content)->key, key) == 0)
+		{
+			free(((t_env *)current->content)->value);
+			((t_env *)current->content)->value = value;
+			return (0);
+		}
+		current = current->next;
+	}
+	return (1);
+}
+
+int	create_value_by_key(char *key, char *value, t_list **head)
+{
+	t_env *content;
+	if (set_value_by_key(key, value, head) == 0)
+		return (0);
+	content = ft_calloc(1, sizeof(t_env));
+	if (content == NULL)
+		return (1);
+	content->key = key;
+	content->value = value;
+	add_sort(head, content);
+	return (0);
+}
+
+t_list	**init_env(char **env)
+{
+	t_list	**head;
+	int		i;
+	t_env	*var;
+
+	head = ft_calloc(1, sizeof(t_list *));
+	if (head == NULL)
+		return (NULL);
+	*head = ft_calloc(1, sizeof(t_list));
+	if (*head == NULL)
+		return (NULL);
+	i = -1;
+	while (env[++i])
+	{
+		var = ft_calloc(1, sizeof(t_env));
+		if (var == NULL)
+			return (NULL);
+		var->key = get_key(env[i]);
+		var->value = get_value(env[i]);
+		add_sort(head, var);
+	}
+	return (head);
+}
diff --git a/minishell.h b/minishell.h
index 99fa3fc..123558d 100644
--- a/minishell.h
+++ b/minishell.h
@@ -6,7 +6,7 @@
 /*   By: cchauvet <cchauvet@student.42angoulem      +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/02/14 13:45:30 by cchauvet          #+#    #+#             */
-/*   Updated: 2023/02/15 18:03:06 by cchauvet         ###   ########.fr       */
+/*   Updated: 2023/02/16 15:11:53 by cchauvet         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -57,4 +57,10 @@ typedef struct s_data
 	int		heredoc;
 }	t_data;
 
+typedef struct s_env
+{
+	void	*key;
+	void	*value;
+}	t_env;
+
 #endif