su (derived from the Switch User) command widely used on the operating systems Unix and Unix-like direction, going from the account of the current user account to another user.

su sometimes as for "spoof user" or "set user" are also used; because this command. account current to another user change. Also, some cases, also to confuse the "superuser" refers to. because in most cases, to switch, to account Root (root) is used.

on the desktops GNOME and KDE to run programs that access level, the user need root. a window opens that user to run the program, have it Password the root user will give.