suo (super user do; officially pronounced /ˈsuːduː/, though /ˈsuːdoʊ/ is also common) 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). By default, sudo will prompt for a user password but it may be configured to require the root password or no password at all. sudo is able to log each command run and in some cases has completely supplanted the superuser login for administrative tasks, most notably in Ubuntu Linux and Apple's Mac OS X.