System Administration Interface/User and Group Administration for Computer Operating System Environments, is part of the POSIX®series of standards for applications and user interfaces to open systems. The purpose of this standard is to provide a common set of utility programs, for the administration of theUser and Group Account entities described in the ISO/IEC 9945-1:1996 (IEEE Std1003.1-1996) and ISO/IEC 9945-2:1993 (IEEE Std 1003.2-1992) standards.