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I can't think of a script, but if you're willing to ssh to the localhost, that could work for passwordless access.
Make sure your user has an ssh key generated via:
ssh-keygen -t rsa
Press enter throughout the prompts, the key here is to not enter a password, rather, have a blank password. Once this is done, copy the ssh id to the root profile so it has the matching key for authentication
Then to escalate without a password - ssh root@localhost.
If that's too much typing, put it in a bash shell with a short name in your bin directory. I just tested and it works
(You'll need the openssh-clients package for commands such as ssh-copy-id, just fyi)
It will ask for password and now you will be logged in as root
If you do not want that it should ask password, copy your .pub file which is in user/.ssh and save in /root/.ssh as authorized_keys
Now next time when you log in to root, it will not ask password.
But if you do not want to use ssh and use sudo for root log in, you can use
It asks for your (user) password and you shift to root command prompt.
But if you do not want that it should ask password.
and uncomment following line
%sudo ALL=NOPASSWD: ALL
Now if you run sudo -i
it does not ask password and you will shift on root command prompt.
After being a member here for TEN YEARS, can you not write a very simple script by now? Especially after asking dozens of questions about scripting, and being handed answers (and directed to scripting tutorials), MANY times.