diff --git a/src/execution/execution.h b/src/execution/execution.h
index 872f0ad..c3e0080 100644
--- a/src/execution/execution.h
+++ b/src/execution/execution.h
@@ -2,8 +2,8 @@
 #define EXECUTION_H
 
 #include "../utils/ast/ast.h"
-#include "../utils/lists/lists.h"
 #include "../utils/hash_map/hash_map.h"
+#include "../utils/lists/lists.h"
 
 /**
  * @brief Execute the AST
diff --git a/src/lexer/lexer_utils.c b/src/lexer/lexer_utils.c
index 0a0a23d..4206c4c 100644
--- a/src/lexer/lexer_utils.c
+++ b/src/lexer/lexer_utils.c
@@ -98,6 +98,14 @@ static void set_token_keyword(struct token *tok, char *begin, ssize_t size)
     {
         tok->type = TOKEN_ELIF;
     }
+    else if (strncmp(begin, "&&", size) == 0)
+    {
+        tok->type = TOKEN_AND;
+    }
+    else if (strncmp(begin, "||", size) == 0)
+    {
+        tok->type = TOKEN_OR;
+    }
 
     // no keywords found.
     if (tok->type == TOKEN_NULL)
diff --git a/src/lexer/lexer_utils.h b/src/lexer/lexer_utils.h
index 729e912..83bc772 100644
--- a/src/lexer/lexer_utils.h
+++ b/src/lexer/lexer_utils.h
@@ -56,7 +56,9 @@ enum token_type
     TOKEN_THEN,
     TOKEN_ELSE,
     TOKEN_FI,
-    TOKEN_ELIF
+    TOKEN_ELIF,
+    TOKEN_AND,
+    TOKEN_OR
 };
 
 struct token
diff --git a/src/parser/grammar_basic.c b/src/parser/grammar_basic.c
index dcb1f1b..b90cf68 100644
--- a/src/parser/grammar_basic.c
+++ b/src/parser/grammar_basic.c
@@ -7,6 +7,24 @@
 #include "../utils/lists/lists.h"
 #include "grammar.h"
 
+// === Static functions
+
+enum ast_and_or_type and_or_tok_to_ast(enum token_type tok_type)
+{
+    switch (tok_type)
+    {
+    case TOKEN_AND:
+        return AST_AND_OR_TYPE_AND;
+    case TOKEN_OR:
+        return AST_AND_OR_TYPE_OR;
+    default:
+        fprintf(stderr, "and_or impossible to init, wrong token type");
+        return AST_AND_OR_NULL;
+    }
+}
+
+// === Functions
+
 struct ast *parse_list(struct lexer_context *ctx)
 {
     struct list *result_list = NULL;
@@ -41,7 +59,37 @@ struct ast *parse_list(struct lexer_context *ctx)
 
 struct ast *parse_and_or(struct lexer_context *ctx)
 {
-    return parse_pipeline(ctx);
+    struct ast *result = parse_pipeline(ctx);
+    struct token *token = PEEK_TOKEN();
+
+    if (token->type == TOKEN_AND || token->type == TOKEN_OR)
+    {
+        // set left part
+
+        struct ast *left = result;
+
+        // eat and_or token
+        token = POP_TOKEN();
+
+        // set type
+        enum ast_and_or_type type = and_or_tok_to_ast(token->type);
+
+        token = PEEK_TOKEN();
+
+        // skip newlines
+        while (token->type == TOKEN_NEWLINE)
+        {
+            token = POP_TOKEN();
+            token = PEEK_TOKEN();
+        }
+
+        // right part
+        struct ast *right = parse_pipeline(ctx);
+
+        result = ast_create_and_or(left, right, type);
+    }
+
+    return result;
 }
 
 struct ast *parse_pipeline(struct lexer_context *ctx)
@@ -190,31 +238,34 @@ struct ast *parse_compound_list(struct lexer_context *ctx)
     while (token->type == TOKEN_NEWLINE)
     {
         token = POP_TOKEN();
+        token = PEEK_TOKEN();
     }
 
     // and_or
     current_cmd = parse_and_or(ctx);
     if (current_cmd == NULL)
         return NULL;
-    list_append(result_list, current_cmd);
+    result_list = list_append(result_list, current_cmd);
 
     // Following commands
     token = PEEK_TOKEN();
     while (token->type == TOKEN_SEMICOLON || token->type == TOKEN_NEWLINE)
     {
         POP_TOKEN();
+        token = PEEK_TOKEN();
 
         // Skip newlines
         while (token->type == TOKEN_NEWLINE)
         {
             token = POP_TOKEN();
+            token = PEEK_TOKEN();
         }
 
         // and_or
         current_cmd = parse_and_or(ctx);
         if (current_cmd == NULL)
             return NULL;
-        list_append(result_list, current_cmd);
+        result_list = list_append(result_list, current_cmd);
 
         token = PEEK_TOKEN();
     }
@@ -223,12 +274,14 @@ struct ast *parse_compound_list(struct lexer_context *ctx)
     if (token->type == TOKEN_SEMICOLON)
     {
         token = POP_TOKEN();
+        token = PEEK_TOKEN();
     }
 
     // Skip newlines
     while (token->type == TOKEN_NEWLINE)
     {
         token = POP_TOKEN();
+        token = PEEK_TOKEN();
     }
 
     struct ast *result = ast_create_list(result_list);
@@ -276,8 +329,8 @@ struct ast *parse_else_clause(struct lexer_context *ctx)
 
     if (token->type == TOKEN_ELSE)
     {
+        token = POP_TOKEN(); // eat else
         result = parse_compound_list(ctx);
-        token = POP_TOKEN(); // Forward
     }
 
     if (result == NULL)
diff --git a/src/utils/ast/ast.c b/src/utils/ast/ast.c
index 4cfdf69..e336a73 100644
--- a/src/utils/ast/ast.c
+++ b/src/utils/ast/ast.c
@@ -2,10 +2,44 @@
 
 #include "ast.h"
 
+#include <assert.h>
 #include <stdbool.h>
+#include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 
+void ast_free(struct ast **node)
+{
+    if (*node == NULL)
+        return;
+    // ast void does not need to be freed.
+    if (ast_is_if(*node))
+        ast_free_if(ast_get_if(*node));
+    else if (ast_is_command(*node))
+        ast_free_command(ast_get_command(*node));
+    else if (ast_is_list(*node))
+        ast_free_list(ast_get_list(*node));
+    else if (ast_is_and_or(*node))
+        ast_free_and_or(ast_get_and_or(*node));
+    else if (ast_is_redir(*node))
+        ast_free_redir(ast_get_redir(*node));
+
+    free(*node);
+    *node = NULL;
+}
+
+struct ast *ast_create(enum ast_type type, void *data)
+{
+    struct ast *node = malloc(sizeof(struct ast));
+    if (!node)
+        return NULL;
+
+    node->type = type;
+    node->data = data;
+
+    return node;
+}
+
 static void ast_print_dot_recursive(struct ast *node, FILE *out)
 {
     if (!node)
@@ -13,6 +47,20 @@ static void ast_print_dot_recursive(struct ast *node, FILE *out)
 
     switch (node->type)
     {
+    case AST_LIST: {
+        struct ast_list *ast_list = ast_get_list(node);
+        fprintf(out, "  node%p [label=\"LIST\"];\n", (void *)node);
+
+        struct list *elt = ast_list->children;
+        while (elt != NULL)
+        {
+            struct ast *child = (struct ast *)elt->data;
+            fprintf(out, "  node%p -> node%p;\n", (void *)node, (void *)child);
+            ast_print_dot_recursive(child, out);
+            elt = elt->next;
+        }
+        break;
+    }
     case AST_IF: {
         struct ast_if *if_data = ast_get_if(node);
         fprintf(out, "  node%p [label=\"IF\"];\n", (void *)node);
@@ -81,38 +129,4 @@ void ast_print_dot(struct ast *ast)
     ast_print_dot_recursive(ast, dot_pipe);
     fprintf(dot_pipe, "}\n");
     pclose(dot_pipe);
-
-    system("open ast.svg");
-}
-
-void ast_free(struct ast **node)
-{
-    if (*node == NULL)
-        return;
-    // ast void does not need to be freed.
-    if (ast_is_if(*node))
-        ast_free_if(ast_get_if(*node));
-    else if (ast_is_command(*node))
-        ast_free_command(ast_get_command(*node));
-    else if (ast_is_list(*node))
-        ast_free_list(ast_get_list(*node));
-    else if (ast_is_and_or(*node))
-        ast_free_and_or(ast_get_and_or(*node));
-    else if (ast_is_redir(*node))
-        ast_free_redir(ast_get_redir(*node));
-
-    free(*node);
-    *node = NULL;
-}
-
-struct ast *ast_create(enum ast_type type, void *data)
-{
-    struct ast *node = malloc(sizeof(struct ast));
-    if (node == NULL)
-        return NULL;
-
-    node->type = type;
-    node->data = data;
-
-    return node;
 }
diff --git a/src/utils/ast/ast_and_or.h b/src/utils/ast/ast_and_or.h
index 7bbe76c..344cfbf 100644
--- a/src/utils/ast/ast_and_or.h
+++ b/src/utils/ast/ast_and_or.h
@@ -7,6 +7,7 @@
 
 enum ast_and_or_type
 {
+    AST_AND_OR_NULL,
     AST_AND_OR_TYPE_AND,
     AST_AND_OR_TYPE_OR
 };