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diff --git a/42sh/src/exec/ast_exec_functions.h b/42sh/src/exec/ast_exec_functions.h
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+++ b/42sh/src/exec/ast_exec_functions.h
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+#ifndef AST_EXEC_FUNCTIONS_H
+#define AST_EXEC_FUNCTIONS_H
+
+#include "builtins/builtins.h"
+#include "exec/ast_eval.h"
+
+#define BASE_RW_SIZE 256
+
+typedef int (*exec_f)(struct ast *ast);
+
+/**
+ * @brief Evaluates the given AST and return the exit code of it.
+ * A command can be a shell builtin or an external binary file called with
+ * `execvp`.
+ * @param ast An `AST_COMMAND` AST to evaluate. It is given as a `struct ast*`
+ * and uses inheritance-like principle.
+ */
+int exec_ast_command(struct ast *ast);
+
+/**
+ * @brief Evaluates the given AST and return the exit code of it.
+ * It performs a lazy evaluation.
+ * @param ast An `AST_LOGICAL` AST to evaluate. It is given as a `struct ast*`
+ * and uses inheritance-like principle.
+ */
+int exec_ast_logical(struct ast *ast);
+
+/**
+ * @brief Evaluates the given AST and return the exit code of the last
+ * `AST_COMMAND`.
+ * @param ast An `AST_LIST` AST to evaluate. It is given as a `struct ast*`
+ * and uses inheritance-like principle.
+ */
+int exec_ast_list(struct ast *ast);
+
+/**
+ * @brief Evaluates the given AST and return the exit code of it.
+ * It performs a lazy evaluation.
+ * @param ast An `AST_IF` AST to evaluate. It is given as a `struct ast*`
+ * and uses inheritance-like principle.
+ */
+int exec_ast_if(struct ast *ast);
+
+/**
+ * @brief Evaluates the given AST and return the exit code of it.
+ * It redirects the standard output of `ast->left` to the standard input of
+ * `ast->right`.
+ * @param ast An `AST_PIPELINE` AST to evaluate. It is given as a `struct ast*`
+ * and uses inheritance-like principle.
+ */
+int exec_ast_pipe(struct ast *ast);
+
+/**
+ * @brief Evaluates the given AST and return the exit code of it.
+ * It gets the redirection details from `ast->redir` which is a `struct
+ * redirect`.
+ * @param ast An `AST_REDIRECTION` AST to evaluate. It is given as a `struct
+ * ast*` and uses inheritance-like principle.
+ */
+int exec_ast_redirection(struct ast *ast);
+
+int exec_ast_while(struct ast *ast);
+
+int exec_ast_assign(struct ast *ast);
+
+int exec_ast_for(struct ast *ast);
+
+/**
+ * @brief Evaluates the given AST and return the exit code of it.
+ * It gets the ast corresponding to the subshell and executes it in a new
+ * environment thanks to the fork(2) function.
+ * @param ast An `AST_SUBSHELL` AST to evaluate It is given as a `struct ast*`
+ * and uses inheritance-like principle.
+ */
+int exec_ast_subshell(struct ast *ast);
+
+#endif /* ! AST_EXEC_FUNCTIONS_H */