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I want to log in to user2 via bash script, so my script contains:

sudo -i -u user2

Also I don't want to enter my sudo password by hands. Before I did something like this:

echo "my_sudo_password" | sudo -S <command>

but if I am trying it in this case:

echo "my_sudo_password" | sudo -S -i -u user2

I have error

-sh: 1: my_sudo_password: not found

Can you answer what am I doing wrong?

Leo
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  • Rather than hardcode the password somewhere, you can [add the script to sudoers](https://askubuntu.com/a/39294/1222991). This will allow *just* this script to run without the password requirement – matigo Mar 26 '22 at 12:16
  • This is really not the intended way to use sudo and is not secure. Hardcoding passwords is a very bad idea. This doesn't work because sudo intentionally prevents it from working. – user10489 Mar 26 '22 at 13:19
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    I *suspect* what's happening here is that your credentials are already cached, so `sudo` is not asking for your password, and the "unused" stdin is getting passed to user2's login shell (as if you'd done `echo "my_sudo_password" | sh -l`) – steeldriver Mar 26 '22 at 15:05
  • @matigo I have a Go CLI tool. When user run this tool it runs some bash commands. If I add that bash commands in sudoers, user will be able to use it manually, but I don't want that. What I need to do in this situation? For now, the only option that I've invented is hardcode the sudo password and run sudo without caching any creds :( – Leo Mar 26 '22 at 16:07

1 Answers1

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If lack of security doesn't bother you, you can try this:

coproc ( sleep 2; xdotool key your_password key Return )
sudo -i -u user2

which simulates your doing it by hand. The sleep wait time can be adjusted to suit your situation.

user985675
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