1GNU Rush is a Restricted User Shell, designed for sites providing limited remote 2access to their resources, such as, for example, savannah.gnu.org. Its main 3program, rush, is configured as a user login shell for users that are allowed 4only remote access to the machine. Using a flexible configuration file, GNU Rush 5gives administrator complete control over the command lines that users execute, 6and allows to tune the usage of system resources, such as virtual memory, CPU 7time, etc. on a per-user basis. 8