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I am trying to gain root user access to another user so that I can run a command with adding sudo in front of any command.

Example: fdisk -l

Getting the error message as:

fdisk: cannot open /dev/loop0: Permission denied
fdisk: cannot open /dev/loop1: Permission denied
fdisk: cannot open /dev/loop2: Permission denied
fdisk: cannot open /dev/loop3: Permission denied

I tried to give the root user access to the user with the name sudhir.

switched to root user with su -

visudoers

Added the user as 

root    ALL=(ALL:ALL) ALL
sudhir  ALL=(ALL:ALL) ALL

screenshot of the sudoers file

Saved with ctrl+o, switched to user & executed the command fdisk -l, still getting the same error.

Any idea?

Melebius
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user497091
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    Did you remember to logout/login after changes to user permissions? – user535733 Jul 10 '19 at 00:52
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    You must still type `sudo fdisk -l` as user sudhir. – PerlDuck Jul 10 '19 at 08:48
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    Is your goal that all commands run by sudhir, even without `sudo`, run as if by root? This is inadvisable; e.g., users shouldn't run `firefox` or `libreoffice` as root (nor with abilities equivalent to root's). Even if you're not concerned about security, this would make some strange and unexpected mistakes easier to make. If you still want that, I recommend you **[edit]** to make that clear. Otherwise, I recommend you **[edit]** about what you do need. Did @PerlDuck's comment answer your question? Do you want `sudo` not to require a password? Does sudhir want a root shell (as with `sudo -i`)? – Eliah Kagan Jul 11 '19 at 01:17
  • I have updated sudoers file saved (ctrl+) & exited (ctrl+x). – user497091 Jul 11 '19 at 02:40
  • @PerlDuck Im trying run command fdisk -l with user "sudhir" without sudo command infront. Just like the root user. – user497091 Jul 11 '19 at 02:43

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