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Fixing Sudo in Fedora Core
Here's how to get SUDO working in Fedora Core Linux
Senerio/Problem
So you just installed a fresh copy of Fedora Core Linux. You were a good boy/girl and you read some of the documentation. You know you aren't normally supposed to use the root user, so during the installation/setup you created a new user named superman. You finish the install and logon as superman. You deside to update your system using yum. You go to a command prompt and type sudo yum check-update. You get some funky error message saying you're not allowed to sudo.
So you're not supposed to use root but you can't sudo by default?
Solution/Fix
You'll have to logon as root at lease once to setup your /etc/sudoers file.
Log off and then log back on as root.
Open a terminal window and type the following (Remember, in this senerio your name is superman):
echo 'superman ALL=(ALL) ALL' >> /etc/sudoers
If you don't want to be prompted for a password every time you sudo, then use this instead:
echo 'superman ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers