execute a command as another user

-i [command]
            The -i (simulate initial login) option runs the shell specified by the password database
            entry of the target user as a login shell.  This means that login-specific resource files
            such as .profile or .login will be read by the shell.  If a command is specified, it is
            passed to the shell for execution via the shell's -c option.  If no command is specified, an
            interactive shell is executed.  sudo attempts to change to that user's home directory before
            running the shell.  The security policy shall initialize the environment to a minimal set of
            variables, similar to what is present when a user logs in.  The Command Environment section
            in the sudoers(5) manual documents how the -i option affects the environment in which a
            command is run when the sudoers policy is in use.