the need of a command named “builtin”

$builtin echo jeffrin
jeffrin
$echo jeffrin
jeffrin
$echo() { echo "hi"; };
$echo jeffrin
^C
$builtin echo jeffrin
jeffrin
$echo jeffrin
^C
$

https://en.wikipedia.org/wiki/Shell_builtin
http://unix.stackexchange.com/questions/11454/what-is-the-
difference-between-a-builtin-command-and-one-that-is-not


(jeffrin) what is the use of the command named "builtin"
(jeffrin) llua : hello
(llua) to avoid a possible wrapper