GNU Rush is a Restricted User Shell,designed for sites providing limited remote access to their resources,such as, for example, savannah.gnu.org.Its main program, rush, is configured as a user login shell forusers that are allowed only remote access to the machine. Using a flexibleconfiguration file, GNU Rush gives administrator complete controlover the command lines that users execute, and allows to tune theusage of system resources, such as virtual memory, CPU time, etc. on aper-user basis.