a

builtins/unset.c

@@ -26,6 +26,11 @@ int	unset(char **args, int fd)
 			fatal("unset", "invalid identifier");
 			return (1);
 		}
+		if (!ft_strcmp(*args, "_"))
+		{
+			args++;
+			continue ;
+		}
 		pop_env(*args);
 		args++;
 	}