Sudo allows a system administrator to give certain users the ability to run some commands as root while logging all commands and arguments. Sudo operates on a per-command basis, it is not a replacement for the shell.

The command used to run programs with administrator priveledges, allowing a user to edit sytem files.

Unix-like operating systems such as BSD, Mac OS X, and Linux that allows users to run programs with the security privileges of another user (normally the system's superuser) in a secure manner. By default, it is installed in /usr/bin.