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+GNU rush is a Restricted User Shell, designed for sites providing limited
+remote access to their resources, e.g. scp, sftp, or access to VCS
+repositories over ssh. Accounts of the users that are allowed remote
+access to the machine are configured to use /sbin/rush as the login
+shell.
+
+Using a flexible configuration file, GNU rush gives administrators
+complete control over the commands that users are allowed to run and their
+possible arguments. It also makes it possible to run commands in chrooted
+environments, limit usage of system resources, and do various other
+administrative tasks.