Interacting with elements and features of z/OS

z/OS provides a number of facilities to enable users to interact directly with the operating system. The z/OS UNIX facility enables users to write and invoke shell scripts and utilities, and to use the shell programming language.

z/OS UNIX also interacts with the following elements and features of z/OS:

BCP (WLM and SMF components)
z/OS XL C/C++ compiler, to compile programs. In V1R6 and earlier, the compiler was known as the z/OS® C/C++ compiler.
Language Environment®, to execute the shell and utilities or any other XPG4-compliant shell application
Data Facility Storage Management Subsystem (DFSMS). HFS is a component of DFSMS.
Security Server for z/OS. (RACF® is a component of the Security Server.)
Resource Measurement Facility™ (RMF™)
System Display and Search Facility (SDSF)
Time Sharing Option Extensions (TSO/E)
Communications Server (TCP/IP)
ISPF, to use the dialogs for OEDIT, OBROWSE, OPUTX, OGETX, or ISPF/PDF for the ISPF shell
Network File System (NFS)
z/OS File System (zFS)

Figure 1 shows how z/OS UNIX, the shell interface, and the API relate to the rest of the z/OS operating system.

Figure 1. z/OS operating system with z/OS UNIX What the z/OS operating system looks like with z/OS UNIX