diff --git a/src/execution/execution_helpers.c b/src/execution/execution_helpers.c
index e82cbfe..24c4100 100644
--- a/src/execution/execution_helpers.c
+++ b/src/execution/execution_helpers.c
@@ -121,7 +121,7 @@ static int get_fd_target(const struct ast_redir *redir)
     if (redir->io_number != -1)
         return redir->io_number;
     if (redir->type == AST_REDIR_TYPE_LESS
-        || redir->type == AST_REDIR_TYPE_DLESS
+        || redir->type == AST_REDIR_TYPE_LESSGREAT
         || redir->type == AST_REDIR_TYPE_LESSAND)
         return 0;
     return 1;
diff --git a/src/parser/grammar_advanced.c b/src/parser/grammar_advanced.c
index 3850564..8c4b68c 100644
--- a/src/parser/grammar_advanced.c
+++ b/src/parser/grammar_advanced.c
@@ -16,7 +16,16 @@ static enum ast_redir_type redir_tok_to_ast_type(enum token_type tok_type)
         return AST_REDIR_TYPE_LESS;
     case TOKEN_REDIR_RIGHT:
         return AST_REDIR_TYPE_GREAT;
-        // TODO finish this
+    case TOKEN_REDIR_DOUBLE_RIGHT:
+        return AST_REDIR_TYPE_DGREAT;
+    case TOKEN_REDIR_LEFT_RIGHT:
+        return AST_REDIR_TYPE_LESSGREAT;
+    case TOKEN_REDIR_LEFT_AMP:
+        return AST_REDIR_TYPE_LESSAND;
+    case TOKEN_REDIR_RIGHT_AMP:
+        return AST_REDIR_TYPE_GREATAND;
+    case TOKEN_REDIR_RIGHT_PIPE:
+        return AST_REDIR_TYPE_CLOBBER;
     default:
         return AST_REDIR_TYPE_NULL;
     }
diff --git a/src/parser/grammar_basic.c b/src/parser/grammar_basic.c
index d4a740f..17e006f 100644
--- a/src/parser/grammar_basic.c
+++ b/src/parser/grammar_basic.c
@@ -152,14 +152,15 @@ struct ast *parse_pipeline(struct lexer_context *ctx)
 struct ast *parse_command(struct lexer_context *ctx)
 {
     struct token *token = PEEK_TOKEN();
+    struct ast *result = NULL;
 
-    if (token->type == TOKEN_WORD)
+    if (is_first(*token, RULE_SIMPLE_COMMAND))
     {
-        return parse_simple_command(ctx);
+        result = parse_simple_command(ctx);
     }
-    else if (token->type == TOKEN_IF)
+    else if (is_first(*token, RULE_SHELL_COMMAND))
     {
-        return parse_shell_command(ctx);
+        parse_shell_command(ctx);
     }
     else
     {
@@ -168,64 +169,102 @@ struct ast *parse_command(struct lexer_context *ctx)
     }
 }
 
+/* @brief: frees command_elements and redirections lists (helper func)
+ * @return: NULL
+ */
+static void *err_simple_command(struct list *command_elements,
+                           struct list *redirections)
+{
+    list_deep_destroy(command_elements);
+    list_deep_destroy(redirections);
+    return NULL;
+}
+
 struct ast *parse_simple_command(struct lexer_context *ctx)
 {
     struct list *command_elements = NULL;
+    struct list *redirections = NULL; // list of redirection ASTs
+
+    bool has_prefix = false;
+    struct token *token = PEEK_TOKEN();
+    if (is_first(*token, RULE_PREFIX))
+    {
+        has_prefix = true;
+        while (is_first(*token, RULE_PREFIX))
+        {
+            struct ast *redir = parse_prefix(ctx);
+            if (redir == NULL)
+            {
+                return err_simple_command(command_elements, redirections);
+            }
+            redirections = list_append(redirections, redir);
+            token = PEEK_TOKEN();
+        }
+    }
 
-    // WORD
-    struct token *token = POP_TOKEN();
     if (token->type != TOKEN_WORD)
     {
-        perror("Expected a command but got a different token type");
-        return NULL;
+        if (!has_prefix)
+        {
+            perror("Expected a command but got a different token type");
+            return err_simple_command(command_elements, redirections);
+        }
+        // else : only prefixes
     }
-    char *command = strdup(token->data);
-    command_elements = list_append(command_elements, command);
-
-    token = PEEK_TOKEN();
-
-    // Eventual elements
-    while (is_first(*token, RULE_ELEMENT))
+    else
     {
-        // Get element
-        struct ast *element = parse_element(ctx);
-        if (element == NULL)
+        if (token->type == TOKEN_WORD)
         {
-            list_deep_destroy(command_elements);
-            return NULL;
-        }
+            char *command = strdup(token->data);
+            command_elements = list_append(command_elements, command);
 
-        // Get element type
-        if (ast_is_word(element))
-        {
-            struct ast_word *element_word = ast_get_word(element);
-            command_elements =
-                list_append(command_elements, element_word->word);
+            POP_TOKEN();
+            token = PEEK_TOKEN();
         }
-        else if (ast_is_redir(element))
+        // Eventual elements
+        while (is_first(*token, RULE_ELEMENT))
         {
-            // TODO
-            perror("NOT IMPLEMENTED");
-            return NULL;
-        }
-        else
-        {
-            perror("Internal error: unexpected return value from parse_element "
-                   "in parse_simple_command");
-            list_deep_destroy(command_elements);
-            return NULL;
-        }
+            // Get element
+            struct ast *element = parse_element(ctx);
+            if (element == NULL)
+            {
+                return err_simple_command(command_elements, redirections);
+            }
 
-        // Forward
-        token = PEEK_TOKEN();
+            // Get element type
+            if (ast_is_word(element))
+            {
+                struct ast_word *element_word = ast_get_word(element);
+
+                // TODO test this fix for the memory leaks
+                char *word = strdup(element_word->word);
+                ast_free(&element);
+                command_elements = list_append(command_elements, word);
+                // end of fix
+            }
+            else if (ast_is_redir(element))
+            {
+                // append redirections to the list of redirections
+                redirections = list_append(redirections, element);
+            }
+            else
+            {
+                perror("Internal error: unexpected return value from "
+                       "parse_element "
+                       "in parse_simple_command");
+                return err_simple_command(command_elements, redirections);
+            }
+
+            // Forward
+            token = PEEK_TOKEN();
+        }
     }
 
     // Result
-    struct ast *result = ast_create_command(command_elements);
+    struct ast *result = ast_create_command(command_elements, redirections);
     if (result == NULL)
     {
-        list_deep_destroy(command_elements);
-        return NULL;
+        return err_simple_command(command_elements, redirections);
     }
     return result;
 }
@@ -254,6 +293,17 @@ struct ast *parse_shell_command(struct lexer_context *ctx)
     return parse_if_rule(ctx);
 }
 
+/* @brief: frees all the arguments. (helper func)
+ * @return: NULL.
+ */
+static void *err_if_rule(struct ast **cond, struct ast **then_clause, struct ast **else_clause)
+{
+    ast_free(cond);
+    ast_free(then_clause);
+    ast_free(else_clause);
+    return NULL;
+}
+
 struct ast *parse_if_rule(struct lexer_context *ctx)
 {
     // If keyword
@@ -272,38 +322,34 @@ struct ast *parse_if_rule(struct lexer_context *ctx)
     token = POP_TOKEN();
     if (token->type != TOKEN_THEN)
     {
-        ast_free(&condition_content);
         perror("Expected the 'then' keyword but token has different type");
-        return NULL;
+        return err_if_rule(&condition_content, NULL, NULL);
     }
 
     // Then content
     struct ast *then_content = parse_compound_list(ctx);
     if (then_content == NULL)
     {
-        ast_free(&condition_content);
-        ast_free(&then_content);
-        return NULL;
+        return err_if_rule(&condition_content, &then_content, NULL);
     }
 
+    struct ast *else_content = NULL;
     // Eventual else/elif clause(s)
-    struct ast *else_content = parse_else_clause(ctx);
-    if (else_content == NULL)
+    if (is_first(*token, RULE_ELSE_CLAUSE))
     {
-        ast_free(&condition_content);
-        ast_free(&then_content);
-        return NULL;
+        else_content = parse_else_clause(ctx);
+        if (else_content == NULL)
+        {
+            return err_if_rule(&condition_content, &then_content, NULL);
+        }
     }
 
     // Fi keyword
     token = POP_TOKEN();
     if (token->type != TOKEN_FI)
     {
-        ast_free(&condition_content);
-        ast_free(&then_content);
-        ast_free(&else_content);
         perror("Expected the 'fi' keyword but token has different type");
-        return NULL;
+        return err_if_rule(&condition_content, &then_content, &else_content);
     }
 
     // Result
@@ -311,11 +357,8 @@ struct ast *parse_if_rule(struct lexer_context *ctx)
         ast_create_if(condition_content, then_content, else_content);
     if (result == NULL)
     {
-        ast_free(&condition_content);
-        ast_free(&then_content);
-        ast_free(&else_content);
         perror("Internal error: could not create a new AST (AST_IF)");
-        return NULL;
+        return err_if_rule(&condition_content, &then_content, &else_content);
     }
 
     return result;
diff --git a/src/utils/ast/ast_command.c b/src/utils/ast/ast_command.c
index 14904ae..c4fe3e6 100644
--- a/src/utils/ast/ast_command.c
+++ b/src/utils/ast/ast_command.c
@@ -5,13 +5,15 @@
 
 #include "../lists/lists.h"
 
-struct ast *ast_create_command(struct list *command)
+struct ast *ast_create_command(struct list *command,
+        struct list *redirections)
 {
     struct ast_command *command_data = malloc(sizeof(struct ast_command));
     if (!command_data)
         return NULL;
 
     command_data->command = command;
+    command_data->redirections = redirections;
 
     return ast_create(AST_CMD, command_data);
 }
@@ -33,5 +35,6 @@ void ast_free_command(struct ast_command *command_data)
     if (command_data == NULL)
         return;
     list_deep_destroy(command_data->command);
+    ast_list_deep_destroy(command_data->redirections);
     free(command_data);
 }
diff --git a/src/utils/ast/ast_command.h b/src/utils/ast/ast_command.h
index cf6b913..835bf5d 100644
--- a/src/utils/ast/ast_command.h
+++ b/src/utils/ast/ast_command.h
@@ -7,6 +7,7 @@
 struct ast_command
 {
     struct list *command; // A list of words (char*)
+    struct ast_list *redirections; // A list of ASTs, all ast_redir
 };
 
 /**
@@ -23,7 +24,8 @@ struct ast_command *ast_get_command(struct ast *node);
 /**
  * Creates a new AST node representing a command.
  */
-struct ast *ast_create_command(struct list *command);
+struct ast *ast_create_command(struct list *command,
+        struct list *redirections);
 
 /*
  * @brief: frees the given ast_command and sets the pointer to NULL.
diff --git a/src/utils/ast/ast_redir.h b/src/utils/ast/ast_redir.h
index eb95942..fdea88c 100644
--- a/src/utils/ast/ast_redir.h
+++ b/src/utils/ast/ast_redir.h
@@ -8,7 +8,7 @@ enum ast_redir_type
     AST_REDIR_TYPE_NULL,
     AST_REDIR_TYPE_LESS, // <
     AST_REDIR_TYPE_GREAT, // >
-    AST_REDIR_TYPE_DLESS, // <<
+    AST_REDIR_TYPE_LESSGREAT, // <>
     AST_REDIR_TYPE_DGREAT, // >>
     AST_REDIR_TYPE_LESSAND, // <&
     AST_REDIR_TYPE_GREATAND, // >&