How to change root password on debian boot?

Question

linux

There is a task to change the root password when loading debian, I prescribe in rc.local:

echo -e "qwerty\nqwerty\n" | /usr/bin/passwd root

But the change does not occur, the output is empty.

Answer 1

Because of the first line in /etc/rc.local:
#!/bin/sh -e
echo -e just doesn't work. You can try replacing the sha-bang with
#!/bin/bash

Answer 2

echo -e "oldpassword\nnewpassword\nnewpassword\n" | passwd 1>/tmp/log.txt 2>&1