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groupadd command

CentOS / Red Hat: Sudo Allows People In Group Admin To Run All Commands

I like the way Ubuntu Linux works – all people in admin groups should able to run all commands after running it via sudo “command-name”. How do I setup sudo under CentOS or Red Hat Enterprise Linux to allow all members of the ‘admin’ group to run all commands?
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Sysadmin because even developers need heroes!!!

Linux Restrict Execution of /usr/sbin/userhelper to Console Users

I‘m CentOS Linux version 5.x user and I’d like to restrict execution of /usr/sbin/userhelper to console users only in xusers group?
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Howto: Linux Add User To Group

How can I add a user to a group under Linux operating system using command line options? How to add an existing user into a group in Linux using command line options?
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