Undo the "sudo" within a script

Question

Is there any way to undo the sudo within the script? like..

sudo ./script.sh

commands 1,2,3,4,5 with sudo rights

commands 6,7,8,9 without sudo rights

Answer 1

If you have to run your script with sudo, you can still run some commands as a normal user using:

sudo -u $SUDO_USER <command>

If you run the following script with sudo:

#!/bin/bash

whoami
sudo -u $SUDO_USER whoami

It will output:

root
sylvain

Answer 2

See the manual for sudo:

-k [command]

When used alone, the -k (kill) option to sudo invalidates the user's cached credentials. The next time sudo is run a password will be required.

So put a sudo -k before every sudo command you want to re-ask for a password. Or behind every command where you want the next commands not to be sudo.

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By the way: if you ask for a password inside the script you should use ...

./script.sh

and not with sudo in front of it.