What is Sudo ?
Sudo stands for "su do", and means "do something as the supervisor". `sudo` is an enhanced alternative to the Unix `su` command. Most Unix systems have some way of letting ordinary users perform certain tasks as root or some other privileged user. The configuration of sudo is by the /etc/sudoers file.
First a little background. The sudo program itself is a setuid binary. If you examine its permissions, you will see:
#ls -al /usr/bin/sudo
---s--x--x 2 root root 159096 Oct 2 2006 /usr/bin/sudo
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