Abstract for UNIX System Service User's Guide

Purpose of this information: This information offers an introduction to the two shells available on z/OS UNIX System Services (z/OS UNIX)— the z/OS shell and the tcsh shell. It provides the information you need to use the z/OS Shells and Utilities on an IBM® z/OS® system. The Shells and Utilities and TSO/E (Time Sharing Option Extensions) provide commands for using z/OS UNIX. It also helps you use the functions specified in the POSIX.2 standard (IEEE Std 1003.2-1992 and ISO/IEC 9945-1992 International Standard; Portable Operating System Interface [POSIX] Part 2: Shell and Utilities). For convenience, it also describes other z/OS UNIX support services.

Who should read this information? This information is for application programmers, systems programmers, and users working on a z/OS system and using z/OS UNIX services or the z/OS shells. It assumes that readers are familiar with the z/OS system and with the information for z/OS and its accompanying products. For information about the features and concepts of z/OS UNIX, and for answers to many questions you might have, see the z/OS UNIX website at

http://www.ibm.com/systems/z/os/zos/features/unix/