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How do I list all sudo users at CentOS server?

There are many groups(root, wheel, adm etc) at server, and have users in it. I am looking an easy way/command to find users in all groups who have sudo access.

Note: My user also have sudo access. And I am using 64-bit CentOS release 5.2 (Final).

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Why down vote? Is there anything wrong with question? – Ahsan Jun 3 '13 at 10:55
What have you tried and why didn't it work? It's probably worth noting that "sudo users" isn't all that accurate as the /etc/sudoers file can allow certain users or groups to run specific commands as root or some other user but not all commands as all users. – Ladadadada Jun 3 '13 at 11:16
up vote 2 down vote accepted

Try this:

for USER in `cut -d: -f1 /etc/passwd`
  sudo -U $USER -l
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Error: sudo: illegal option -U'` – Ahsan Jun 3 '13 at 11:32
Unfortunately I didn't try this on CentOS, only on Ubuntu. What version of CentOS are you using? – Ladadadada Jun 3 '13 at 11:37
64-bit CentOS release 5.2 (Final). All commands I found over internet are for Ubuntu or other. Those are not working on my CentOS server. – Ahsan Jun 3 '13 at 11:40
It's not a Debian/Ubuntu specific addition. It's in the source. You may have better luck with a more recent version of CentOS. – Ladadadada Jun 3 '13 at 11:51
No way on CentOS 5.2 ? – Ahsan Jun 3 '13 at 11:58

What is wrong with sudo cat /etc/sudoers and maybe getent group <groupname> to get usernames of group members?

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sudo cat /etc/sudoers shows the groups, i didnt find any users in it and also tried your commnad. I am looking easy way/command which list all users who have sudo rights? – Ahsan Jun 3 '13 at 11:38

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