2004ISO/IEC 9945-2:2003/Cor 1:2004 Information technology - Portable Operating System Interface (POSIX) - Part 2: System Interfaces; Technical Corrigendum 1
2003ISO/IEC 9945-2:2003 Information technology - Portable Operating System Interface (POSIX?) - Part 2: System interfaces
2002ISO/IEC 9945-2:2002 Information technology - Portable Operating Systems Interface (POSIXę) - Part 2: System interface
1993ISO/IEC 9945-2:1993 Information technology; Portable Operating System Interface (POSIX); part 2: shell and utilities