Yasu was originally created with System Administrators who service large groups of workstations in mind, Yasu (Yet Another System Utility) was made to do a specific group of maintenance tasks quickly within a few clicks, rather than needing to endlessly type shell script commands in the Terminal application.
Yasu allows system administrators, as well as the average user, to conveniently run various system level Unix shell scripts in order to perform maintenance routines and clear the many cache files used by OS X. Yasu was designed to be a simple, first line of attack for a workstation that has started "acting up." More often than not, a thorough purge of the cache files of a Mac will bring its behavior back into line.