Ubuntu – Why is it called sudo


Why do we use sudo to perform a terminal command as an administrative? Why isn't it admin or something else? Is there a reason for sudo?

Best Answer

From Wikipedia:

sudo is a program for Unix-like computer operating systems that allows users to run programs with the security privileges of another user (normally the superuser, or root). Its name is a concatenation of "su" (substitute user) and "do", or take action.

Unlike the su command, users typically supply their own password to sudo rather than the root password. After authentication, and if the /usr/local/etc/sudoers (sometimes found at /etc/sudoers) configuration file permits the user access, then the system will invoke the requested command. The sudoers configuration file enables a huge amount of configurability, including but not limited to: enabling root commands only from the invoking terminal; not requiring a password for certain commands; requiring a password per user or group; requiring re-entry of a password every time or never requiring a password at all for a particular command line. It can also be configured to permit passing arguments or multiple commands, and even supports commands with regular expressions.

Its a temporary one-time command with superuser (administrator) privileges without direct root login.